JP2003138367A - Thermal spray coating, method for forming thermal spray coating, and thermal spray raw material powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal spray coating which has excellent seizure resistance and wear resistance under the driving conditions of high rotation, high loads, and no lubrication, to provide a method for easily forming the thermal spray coating on the surface of a base material to be thermal-sprayed at a high speed, and to provide thermal spray raw material powder. SOLUTION: The thermal spray coating consists of an Al and/or Al alloy structure where the phase of an Sn component as a simple substance is dispersed. In the method of thermally spraying thermal spray raw material powder on the surface of the base material to be thermal-sprayed to form a film thereon, Al and/or Al alloy powder containing 5 to 40 wt.% Sn is used as the thermal spray raw material powder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for forming a sprayed coating having excellent slidability, which requires seizure resistance and wear resistance, such as Al alloy, Cu alloy, cast iron or Equipment parts made of steel alloys, in particular, a sprayed coating having excellent lubricity and wear resistance formed on the surface of part or all of a swash plate for an air compressor pump, a method for forming the sprayed coating, and a sprayed coating. It relates to the raw material powder.

[0002]

2. Description of the Related Art Conventionally, for example, a swash plate for an air compressor pump has a mechanism for reciprocating a piston through a shoe that is in contact with both sides of the swash plate when it rotates. The shoe slides on the circumference of the plate.

Usually, the swash plate is made of Al alloy, Cu alloy, cast iron or steel alloy, and the sliding mating shoe is formed of SUJ2. Therefore, seizure occurs when lubrication becomes insufficient. Occurs. Therefore, conventionally, on the surface of the swash plate, Sn plating, Teflon (trade name, manufactured by E. I. DuPont), application of MoS ₂ (solid lubricant), sintering of Pb-containing Cu alloy and Pb-containing Cu alloy Processing such as thermal spraying (Japanese Patent Laid-Open No. 10-8231) is applied.

[0004]

However, the Sn-plated swash plate is subject to severe wear and is likely to be in a non-lubricated state under the operating conditions of high rotation and high load. It will be burned. Further, Sn plating requires about 30 minutes to form a film having a thickness of 10 μm, and a lot of time is required for masking an unnecessary portion, which causes a problem in workability.

Similarly, a Teflon-coated swash plate is subject to severe wear under operating conditions of high rotation and high load, and eventually the swash plate and the shoe are seized.
Further, it takes more time to mask the unnecessary portion than Sn plating, which causes a problem in workability.

In the application of MoS ₂ (solid lubricant), the coating film is drastically reduced under the operating conditions of high rotation and high load, and when the film disappears, the swash plate and the shoe will be seized immediately.

Sintering of Cu alloy containing Pb and Cu containing Pb
The alloy spray coating (Japanese Patent Laid-Open No. 10-8231) is made of Pb.
It is expected that it will soon be impossible to use due to environmental safety issues.

To the best of the knowledge of the inventors of the present invention at present, it shows excellent seizure resistance and wear resistance under operating conditions of high rotation and high load, such as Al alloy, Cu alloy, cast iron or steel light alloy. There is no suitable coating material to be applied to the surface of the sliding member or the like manufactured in. Moreover, there is no surface modification method that has a short working process and a high film formation (film formation) rate.

Therefore, an object of the present invention is to provide a sprayed coating having excellent seizure resistance and wear resistance under high-speed, high-load, non-lubricated operating conditions, and further to provide such a sprayed coating at high speed and easily. It is to provide a method and a raw material powder for thermal spraying which can be formed on the surface of a thermal sprayed substrate.

Another object of the present invention is to provide a sprayed coating having good adhesion with no particles falling off from the coating at the time of finish processing, no defects on the finished surface, and a method for forming such a sprayed coating. It is to provide a thermal spraying raw material powder.

Another object of the invention is, in particular, Al alloys, C
Thermal spray coating that gives excellent lubricity and wear resistance to a part or all of the surface of a swash plate for an air compressor pump made of u alloy, cast iron, steel alloy, and the like, and a method for forming such thermal spray coating and thermal spray. It is to provide a raw material powder.

Still another object of the present invention is to facilitate the recycling, especially by forming it on the surface of the Al alloy member, and it can be used as a substitute for the Pb-containing sliding member, which is lightweight and environmentally friendly. A thermal spray coating capable of improving safety, a method for forming such a thermal spray coating, and a thermal spray raw material powder.

[0013]

Means for Solving the Problems The inventors of the present invention have made many experimental studies to solve the above-mentioned problems, and as a result of extensive studies, produced an Al alloy powder containing Sn by an atomizing method,
By using this powder to form a film by the thermal spraying method,
The inventors have found that the above problems can be solved, and have come to inertialize the present invention.

That is, the above object is achieved by the thermal spray coating, the method for forming the thermal spray coating, and the thermal spray raw material powder according to the present invention. In summary, the first aspect of the present invention is a thermal spray coating characterized by comprising Al and / or Al alloy composition in which a simple Sn component phase is dispersed.

According to one embodiment of the present invention, as the thermal spraying raw material powder, Al and / or A containing 5 to 40% by weight of Sn.
It is formed by spraying a 1-alloy powder on the surface of a sprayed substrate. According to another embodiment of the first aspect of the present invention, the sprayed coating is formed by spraying Al and / or Al alloy powder further containing 17 to 50 wt% of Si on the surface of the sprayed substrate.

According to one embodiment of the present invention, the thermal spraying raw material powder is produced by an atomizing method and has A as a component.
1 to 45 to 95% by weight, Sn to 5 to 40% by weight, Si further to 50% by weight or less, Mg to 6% by weight or less, Cu
5 wt% or less, Zn 5 wt% or less, Mn 1 wt%
Below, either 0.7 wt% or less of Fe or 0.35 wt% or less of Cr is contained. The particle diameter range of the thermal spraying raw material powder is preferably 10 to 150 μm.
According to another embodiment, the thermal spray raw material powder comprises:
(A) Atomization method is used, and Al is used as a component.
Powder containing 90 to 90% by weight of Sn and 10 to 40% by weight of Sn,
(B) It is produced by the atomization method and contains 50 Al as a component.
~ 95 wt%, Si less than 50 wt%, Mg 6 wt%
Below, 5 wt% or less of Cu, 5 wt% or less of Zn, and Mn
1% by weight or less, Fe 0.7% by weight or less, Cr 0.
It is a mixed powder of powder containing 35% by weight or less. The mixed powder is obtained by mixing 50 to 70% by weight of the (A) powder and 30 to 50% by weight of the (B) powder. The particle size range of the (A) powder is 30 to 150 μm.
m, the particle size range of the (B) powder is preferably 10 to 150 μm.

In the present invention, according to one embodiment, the thermal spray coating is a flame using propane gas, propylene gas, butane, ethane, ethylene, natural gas, hydrogen gas or kerosene as a combustion gas, and oxygen or air as a supporting gas. Temperature 1500 ~ 2800 ℃, Frame speed 1000
It is formed by forming a high-speed frame of ˜2500 m / sec, maintaining a spraying distance of 100 to 400 mm using this high-speed frame, and spraying the spraying raw material powder on the surface of the base material to be sprayed. According to another embodiment, the thermal spray coating is
Inert gas is heated to 300 ℃ or more and the speed is 1000m /
It is formed by forming a high-speed jet for a second or more and spraying the thermal spraying raw material powder onto the thermal spraying base material using this high-speed jet. According to a preferred embodiment of the present invention, the thermal spray coating is formed on the surface of the thermal sprayed substrate that has been roughened to have a roughness μmRz = 25 to 90.

In the present invention, the thermal spray coating is an Al alloy,
It can be formed into a device part made of Cu alloy, cast iron or steel alloy. In particular, the equipment component may be a swash plate for an air compressor pump.

According to the second aspect of the present invention, in the method of spraying the sprayed raw material powder on the surface of the sprayed base material to form a film on the surface of the sprayed base material, Sn is added to the sprayed raw material powder in an amount of 5 to 5%. There is provided a method for forming a thermal spray coating, which comprises using Al and / or Al alloy powder containing 40% by weight.

According to the third aspect of the present invention, it is formed by the atomization method and contains 45 to 95% by weight of Al and 5 to 40% by weight of Sn as components, and further contains 50% by weight or less of Si and Mg. 6 wt% or less, Cu 5 wt% or less, Z
n is 5 wt% or less, Mn is 1 wt% or less, and Fe is 0.7.
There is provided a thermal spraying raw material powder characterized by containing any one of weight% or less and Cr of 0.35 weight% or less.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The thermal spray coating, the method for forming the thermal spray coating, the thermal spray raw material powder, and the article on which the thermal spray coating is formed according to the present invention will be described in more detail with reference to the drawings.

FIG. 6 shows a schematic structure of a high-speed flame spraying apparatus (spraying gun) 1 capable of implementing the present invention. Briefly described, the thermal spray gun 1 has a powder charging port 2 for charging a thermal spraying material in the center thereof, and at the same center around the powder charging port 2, the nozzle (insert 3a, shell) 3b) 3 and an air cap 4 are arranged to form a combustion / auxiliary combustion mixed gas passage 7 and compressed air passages (for auxiliary cooling) 6 and 8. Further, an air cap body 5 is arranged outside the air cap 4. Since the structure of such a thermal spray gun 1 is well known to those skilled in the art, further detailed description will be omitted.

The thermal spraying raw material powder is carried by an inert gas such as nitrogen gas, supplied to the powder charging port 2, and jetted into the combustion flame from the tip of the port. On the other hand, the high-pressure gas supplied from the combustion / assisted combustion mixed gas passage 7 burns at the outer peripheral portion of the tip of the nozzle (insert 3 a, shell 3 b).
This combustion flame is wrapped in compressed air, ejected from the air cap 4 at high temperature and high pressure, and has a cylindrical ultra-high speed flame (flame) 9
Becomes The thermal spray raw material powder ejected from the tip of the port 2 by the ultra-high speed frame 9 is heated at the center of the frame, melted, accelerated, and ejected from the thermal spray gun 1 at a high speed. Then, the thermal spraying material droplets collide with a desired thermal spraying base material 100 arranged at a predetermined distance to form a thermal spraying coating 102 on the surface thereof.

Next, the thermal spraying raw material powder according to the present invention will be described.

In the present invention, as the thermal spraying raw material powder, Sn is used.
Al and / or Al alloy powders containing are used. This thermal spray raw material powder contains 45 to 95% by weight of Al as a component,
The Sn content is 5 to 40% by weight.

In the thermal spraying raw material powder, if Al is less than 45% by weight, brittleness occurs, while if it exceeds 95% by weight, the effect of other added metals (described later) is impaired. Therefore, the amount of Al in the thermal spraying raw material powder is 45% by weight to 95% by weight, preferably 55 to 75% by weight.

When used alone, Sn has excellent seizure resistance and acts as a solid lubricant. Sn does not form an alloy with Al and has the property of separating, and the function of the solid lubricant can be maintained. However, Sn is 5 in the thermal spray raw material powder.
If it is less than wt%, the effect is small. On the other hand, when Sn exceeds 40% by weight in the thermal spraying raw material powder, the strength of the thermal spray coating is remarkably reduced and brittleness is increased. Therefore, the amount of Sn in the thermal spray raw material powder is 5 to 40% by weight, preferably 5 to 40% by weight.
It is set to 20% by weight.

Also, Al containing Sn as a powder for thermal spraying
The alloy powder further preferably contains 17 to 50 wt% Si.
Contains. Si forms an alloy with Al, but if Si is 17% by weight or more in the thermal spraying raw material powder, hard primary crystals of Si crystallize out and wear resistance is improved. However, if the amount of Si in the thermal spray raw material powder exceeds 50% by weight, the tensile strength of the thermal spray coating decreases and brittleness increases. Therefore, the amount of Si in the thermal spray raw material powder is 17 to 40% by weight, preferably 2
It is set to 5 to 40% by weight.

Alternatively, the Al alloy powder containing Sn as the thermal spraying raw material powder further contains 50% by weight or less of Si and 6% by weight.
Mg below, 5% by weight or less Cu, 5% by weight or less Z
n, 1 wt% or less Mn, 0.7 wt% or less Fe,
It may contain any of Cr up to 0.35%. S
When i, Mg, Cu, Zn, Mn, Fe, and Cr each form an alloy with Al in an amount within the above range, the tensile strength is improved, and the tensile strength of the thermal spray coating is improved. However, if each of these metals exceeds the above range, it becomes brittle, which is not preferable. For example, Cu, Cu and M
g, Mg and Si, Zn and Mg, etc. can be contained in the thermal spray raw material powder.

The Al component contained in the thermal spraying raw material powder is Al
Contains less than 0.05% by weight of impurities, that is, 9
It may be Al having a purity of 9.95% by weight or more, or may be an Al alloy alloyed with the above-mentioned other components.

The thermal spraying raw material powder having the above composition can be produced by an atomizing method. Since Al and Sn do not form an alloy in the starting raw material for producing the thermal spray raw material powder, when the atomizing method is used for the production, a powder in which Sn is precipitated at the grain boundary of Al is formed during the solidification process. Preferably, the oxygen content is set to less than 1000 ppm by the atomization method using an inert gas. When producing the thermal spraying raw material powder by the atomization method, when Si is contained in the starting raw material in an amount of 15% by weight or more in the ratio to Al, an Al alloy in which fine single particles of Si are dispersed is formed. Further, the above-mentioned other components contained in the starting material are A when the thermal spraying raw material powder is produced by the atomizing method.
l alloy is formed. The part of the starting material that does not form an alloy exists in the thermal spray material powder as a simple substance.

In the atomizing method, the raw material metal is melted,
This is a method of forming a thermal spray raw material powder by spraying with water or an inert gas. Since the atomization method itself is well known to those skilled in the art, further detailed description will be omitted.

The particle size range of the thermal spraying raw material powder is 10 to 1
It is desirable that the thickness is 50 μm, preferably 45 to 100 μm. When the particle diameter of the thermal spraying raw material powder is less than 10 μm,
An excessive amount of oxide is formed, and the oxide is deposited between the spray particles. On the other hand, the particle size of the thermal spray raw material powder is 150μ
If it exceeds m, a large amount of unmelted particles fall into the thermal spray coating,
It is not preferable because it lowers the tensile strength of the film. Therefore, the particle size range of the thermal spraying raw material powder is set to 10 to 150 μm, preferably 45 to 100 μm. According to the atomizing method, particularly the gas atomizing method, the particle size range of the thermal spraying raw material powder can be suitably adjusted to the above range. still,
In the present specification, the average particle size of the powder is measured by the laser track method.

The thermal spraying raw material powder in the above component range may be prepared as a mixed powder. That is, (A) a powder produced by the atomization method, containing 50 to 90% by weight of Al and 10 to 40% by weight of Sn as components, and (B) produced by the atomization method, 50 to 95% by weight of Al as a component. , Si 5
0 wt% or less, Mg 6 wt% or less, Cu 5 wt% or less, Zn 5 wt% or less, Mn 1 wt% or less, Fe 0.7 wt% or less, Cr 0.35 wt% or less A mixed powder of the powder containing and the powder containing can be suitably used.

These (A) powder and (B) powder are
(A) 50 to 70% by weight of powder, (B) powder 30
~ 50 wt% are mixed. In this case, the particle size range of the (A) powder is 30 to 150 μm for the same reason as described above.
m, the particle size range of the (B) powder is 10 to 150 μm. Thus, by obtaining the thermal spraying raw material powder as a mixed powder of the (A) powder and the (B) powder, the characteristics of the (A) powder having excellent seizure resistance and the (B) powder having excellent abrasion resistance Is advantageous in that it can be effectively dispersed in the film.

The thermal spray coating of the present invention is mainly composed of Al and / or Al by the thermal spraying method using the thermal spray raw material powder having the above composition.
In the thermal spray coating composed of the alloy structure, a single Sn component,
Furthermore, the phase of the Si component is formed so as to be appropriately dispersed as a lump. In the thermal spray coating, the Al part that does not form an alloy is
Exists as a single organization.

When this thermal spray coating is preferably formed by using a high-speed flame spraying method (high-speed gas flame spraying method), the change in the components of the spraying raw material powder is small, the adhesion strength between particles is large, Sn, and Can prevent the mass of the Si phase from falling off. Thereby, the tensile strength of the coating is stable, and a sprayed coating having excellent seizure resistance and wear resistance can be obtained. For this reason, it is possible to prevent particles (Sn, Si components) from falling off from the coating when the coating is machined, and it is possible to perform sound processing finish without cavities.

The high-velocity flame spraying method in the present invention uses propane gas, propylene gas, butane as combustion gas,
It is a thermal spraying method that uses ethane, ethylene, natural gas, hydrogen gas or kerosene, oxygen or compressed air as a supporting gas, and combustion energy by mixing combustion of these combustion gas and supporting gas.

The flame temperature is 1500 to 2800 ° C.,
It is preferably in the range of 1800 to 2700 ° C. When the flame temperature exceeds 2800 ° C., Sn contained in the thermal spray raw material powder, particularly Sn, is oxidized and vaporized, and the components are reduced.
In addition, Sn and its oxide are laminated on the grain boundary in the thermal spray coating,
Decrease the adhesion strength between particles. On the other hand, if the flame temperature is less than 1500 ° C., the temperature of the thermal spraying raw material powder becomes low, and unmelted particles increase, which is not preferable. Here, the temperature is a value measured by a CCD camera.

The frame rate is 1000 to 2500.
m / sec, preferably 1400 to 2500 m / sec. When the flame speed is less than 1000 m / sec, the heating time is long, and Sn contained in the thermal spray raw material powder, in particular, is oxidized and vaporized, and the components are reduced. Further, since the acceleration is insufficient, the adhesion strength of the surface of the sprayed substrate and the adhesion strength between particles in the sprayed coating are insufficient, which causes peeling, which is not preferable. On the other hand, the current thermal spray gun 1 having the above-mentioned configuration
Due to the above structure, the maximum speed of the frame is limited to about 2500 m / sec. Here, the speed is a value measured by a laser strobe.

The spraying distance during spraying (distance between the spray gun 1 and the substrate 100 to be sprayed) is maintained in the range of 100 to 400 mm, preferably 200 to 300 mm. If this spraying distance is less than 100 mm, the thermal spraying of the base material to be sprayed is large and the base material is deformed. On the other hand, if the thermal spraying distance exceeds 400 mm, the amount of oxidation of the thermal spraying powder is large, the adhesion strength between particles in the thermal spray coating is insufficient, and this causes peeling, which is not preferable.

The surface of the substrate to be sprayed expands the adhesion surface,
In order to maintain the adhesion strength with the sprayed coating, it is necessary to remove part or all of the scale of the surface of the sprayed substrate to be sprayed before forming the coating, wash it in advance, and perform roughening treatment. is there. The roughening treatment is preferably performed by a grit blast treatment, and is performed by spraying grit such as SiC or alumina on the surface of the base material to be sprayed at a pressure of about 0.5 MPa.

The surface to be sprayed of the base material to be sprayed, which has been roughened mainly by brass treatment, has a surface roughness of μmRz (JIS
B 0601: Ten-point average roughness) = 25 to 90. μ
When mRz is less than 25, the adhesion strength between the thermal spray coating and the substrate to be sprayed is insufficient under high load, which causes peeling. μ
When mRz exceeds 90, it is difficult to form a thin film so that the thickness of the sprayed coating becomes uniform. Preferably, μmRz
= 30-60.

After the blast treatment, it is preferable to heat the substrate to be sprayed to 50 to 150 ° C. and then spray it, but it is not always necessary to heat it. Raising the temperature to 50 ° C. or higher has the effect of suppressing the occurrence of dew condensation and increasing the adhesion. Further, in order to prevent thermal deformation of the base material and strength deterioration of the base material, the base material is kept at 150 ° C. or lower. Furthermore, it is desirable to control the temperature of the coating and the base material during thermal spraying to 200 ° C. or lower, preferably 150 ° C. or lower in order to prevent oxidation of the coating.

The thickness of the coating is preferably 0.02 mm or more in order to obtain the wear resistance effect, and 0.5 mm or less in order to prevent peeling during thermal spraying or peeling due to thermal stress during sliding. . The surface roughness of the coating after spraying is μmRa
(JIS B 0601: Centerline average roughness) = 0.4-
It is preferable to finish it to 6.0. μmRa is 6.
If it exceeds 0, the seizure resistance is impaired, and if it is less than 0.4, the cost becomes high.

Further, the thermal spray coating according to the present invention comprises He, A
By heating an inert gas such as r or N ₂ to 300 ° C or higher,
It can also be obtained by forming a high-speed jet having a speed of 1000 m / sec or more and using this high-speed jet to spray a thermal spraying raw material onto a substrate to be sprayed. Even when a film is formed using this high-speed jet spraying method, the change in the components of the spraying raw material powder is small, the adhesion strength between the particles is large, and it is possible to prevent Sn and further the mass of the Si phase from falling off. The same effect as in the case of the flame spraying method can be obtained. A thermal spraying apparatus capable of carrying out such a method will be briefly described. As shown in FIG. 7, the high-speed low-temperature jet thermal spraying apparatus 10 uses H 2 as a carrier gas.
It has a high-pressure cylinder 11 for supplying an inert gas such as e, Ar, and N ₂ , a high-pressure powder supply device 12 for controlling the amount and speed of powder and carrier gas, and a high-speed combustion gun 13 having a nozzle 14. . The thermal spray raw material powder is injected at high speed by the above-mentioned inert gas by the high-pressure powder supply device 12, the high-pressure fuel 15 is supplied by the high-speed combustion gun 13 at the outlet, the heat quantity and speed of the flame are controlled, and the nozzle 14
A high-speed jet frame 16 of 300 degrees or more and 1000 m / sec or more is formed from the tip of the. The high-speed jet frame 16 heats and accelerates the powder to eject it at high speed. Then, the powder collides with the surface of the spray-coated base material 100 to form the sprayed coating 102 on the surface.

The cross-sectional structure of the sprayed coating formed according to the present invention was observed with an optical microscope (magnification: 200), and the results are shown in FIG. An Al alloy structure in which Sn represented by black dots and Si particles represented by gray are uniformly dispersed and distributed was observed. FIG. 2 shows an SEM observation image (magnification: 100 times) of the appearance of an Al alloy powder, which is a thermal spraying raw material powder produced by the atomizing method according to the present invention and has Sn on the surface.

Next, the present invention will be further described with reference to Examples and Comparative Examples.

Example As a spraying raw material powder, a sprayed coating prepared by using a spraying raw material powder having the composition shown in the following table was evaluated for pressure resistance, wear resistance and seizure resistance. The test is carried out for Examples 1 and 2 according to the invention and Comparative Examples 1 to 3 not according to the invention,
We compared and examined. Comparative Examples 2 and 3 are conventional Pb-containing Cu alloy spray coatings.

The thermal spraying raw material powders are all produced by an atomizing method using an inert gas. The mixed powder is
The powders produced by the atomizing method were mixed in the following proportions.

A ring-shaped test piece having an outer diameter of 85 mm, an inner diameter of 42 mm, and a thickness of 5.5 mm, which was produced by SS400, was used as the base material to be sprayed.

First, the sprayed surface of the ring-shaped test piece was
The rough surface of mRz = 30-60 was processed. This surface-roughening treatment is performed using alumina grit (particle size # 20 (JIS R 60
01, JIS R 6111); 710 to 1700μ
m) was sprayed at a pressure of 0.5 MPa by a grit blast treatment.

Next, pre-heat treatment was performed using the thermal spray gun 1 shown in FIG. At this time, the thermal spray gun 1 was operated under the following thermal spraying conditions, except that the thermal spraying raw material powder was not supplied, the thermal spraying distance was kept at 250 mm, and only the flame was sprayed to heat the test piece to 100 ° C. Then, moisture, water and water vapor on the surface of each test piece were removed.

Then, on this surface, the spray gun 1 shown in FIG.
By using the high speed flame spraying method under the following conditions
A thermal spray coating with a thickness of μm was applied. Furthermore, the surface of the sprayed coating is cut to obtain μmRa = 0.8 to 1.0 and a thickness of 100 to
Finished to 120 μm. There were no cavities with a diameter of 0.01 mm or more on the finished surface. (High-speed flame spraying conditions) -Combustion gas Propylene gas: Pressure = 6.5 Bar (0.65 MPa) Flow rate = 50-75 SLM-Supporting gas oxygen: Pressure = 12 Bar (1.2 MPa), Flow rate = 300-350 SLM-Auxiliary cooling compression Air: Pressure = 6 Bar (0.6 MPa) Flow rate = 350 to 450 SLM Here, “SLM” means the gas flow rate (liter / minute) converted to the standard state.・ Frame temperature: Approx. 2500 ° C. ・ Frame speed: Approx. 1500 m / sec ・ Spraying distance: 200 to 280 mm ・ Powder supply amount: 30 to 50 g / min

[0055]

[Table 1]

The pressure resistance was measured by using a ring-shaped test piece having a thermal spray coating produced as described above, compressing it with a universal testing machine, and measuring the pressure resistance at which the thermal spray coating and the substrate were sheared and separated. . The result is shown in FIG.

Similarly, using the ring-shaped test piece having the sprayed coating produced as described above, a pin-on-desk test was conducted to evaluate wear resistance and seizure resistance. As a mating material, SUJ2 has hardness Rc (Rockwell hardness tester:
C hardness) = 58 to 60 and finished to μmRa = 0.3 or less (SUJ2 block) was used. In the pin-on-desk test, the SUJ2 block was pressed against the surface of the ring-shaped test piece at a surface pressure of 220 MPa, and the test piece was rotated at a peripheral speed of 20 m / sec. The amount, that is, the aggressiveness of the opponent, was measured. The result is shown in FIG.

Further, the SUJ2 block was applied to the ring-shaped test piece having the sprayed coating prepared as described above with a surface pressure of 2
The test piece was pressed at 20 MPa and the test piece was rotated at a peripheral speed of 20 m / sec, and the load until seizure was measured. The result is shown in FIG.

As a control, a conventional Sn-plated surface (plating thickness of 0.01 mm) of the above-mentioned ring-shaped test piece was used, and pressure resistance, abrasion resistance, and resistance under the same conditions were used. The bakeability was tested.

Comprehensive evaluation from the results shown in FIG. 3 to FIG.
It can be seen that Examples 1 and 2 produced according to the present invention show equivalent or superior seizure resistance and wear resistance under the operating conditions of high rotation and high load, as compared with Comparative Examples. In contrast, the conventional Sn-plated product, which had a maximum wear depth of 0.01 mm or more, was exposed and the base SS400 was exposed and seized.
It was found that the test piece on which the thermal spray coating was formed according to the present invention was excellent in wear resistance, seizure resistance, and pressure resistance.

As described above, in the thermal spray coating according to the present invention, for example, even when it becomes impossible to use an alloy system containing Pb due to the environmental safety problem of Pb, instead of this, for example, an air compressor pump. It can be sufficiently used as a thermal spray coating applied to a swash plate and can be made lightweight. Further, since the thermal spray coating is mainly composed of Al or an Al alloy structure, it is easy to recycle by forming it on the surface of the Al alloy member.

[0062]

As described above, according to the present invention,
By spraying the surface of the substrate to be sprayed with Al or Al alloy powder containing Sn (Al-Sn alloy powder), (1) excellent seizure resistance under high rotation, high load and no lubrication conditions It is possible to form a coating film having the property of abrasion resistance and abrasion resistance on the surface of the base material to be sprayed at high speed and easily. (2) It is possible to produce a coating having good adhesion with no defects on the finished surface without particles falling off from the coating during the finishing process. (3) In particular, it is possible to form a sprayed coating excellent in lubricity and wear resistance on the surface of part or all of the swash plate for an air compressor pump made of an Al alloy, a Cu alloy, cast iron or a steel alloy. . (4) In particular, by forming it on the surface of the Al alloy member, recycling can be facilitated and it can be used as a substitute for the Pb-containing sliding member, so that the weight can be reduced and the safety to the environment can be improved. And many other effects can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional structure diagram (optical microscope observation image) of a thermal spray coating formed according to the present invention.

FIG. 2 is an external view (SEM observation image) of the thermal spraying raw material powder according to the present invention.

FIG. 3 is a graph showing pressure resistance of a sprayed coating formed according to the present invention and a comparative example.

FIG. 4 is a graph showing wear resistance of a thermal spray coating formed according to the present invention and a comparative example.

FIG. 5 is a graph showing a baking load in a sprayed coating formed according to the present invention and a comparative example.

FIG. 6 is a diagram showing a schematic configuration of an example of a thermal spraying device that can be used to carry out the present invention.

FIG. 7 is a diagram showing a schematic configuration of another example of the thermal spraying device that can be used for carrying out the present invention.

[Explanation of symbols]

1 High speed flame spraying equipment 2 Powder input port 3 nozzles 4 Air cap 5 Air cap body 6,8 compressed air 7 Combustion and auxiliary combustion mixed gas 9 high-speed frames 10 High-speed low-temperature jet spraying equipment 100 Thermal spray base material 102 Thermal spray coating

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C23C 4/12 C23C 4/12 F04B 27/08 F04B 27/08 A E L (72) Inventor Tadanori Arakawa Tokyo 3-4-2 Hikawadai, Nerima-ku, Tokyo Within Suruza Meteco Japan Co., Ltd. (72) Inventor Jun Kusunii 3-6-8, Kutaro-cho, Chuo-ku, Osaka-shi, Osaka Toyo Aluminum Co., Ltd. (72) Inventor Toru Kimura F-term in Toyo Aluminum Co., Ltd. 3-6-8, Kutaro-cho, Chuo-ku, Osaka City, Osaka Prefecture (reference) 3H076 AA05 BB26 BB38 CC20 CC99 4K018 AA16 AA18 BA08 BB04 BC12 BD09 KA02 4K031 AA02 AB08 BA01 CB01 CB10 CB18 CB37 DA01 EA10 EA10 EA10 EA

Claims (30)

[Claims] 1. An Al in which a single Sn component phase is dispersed.
And / or an Al alloy structure. 2. The thermal spray coating according to claim 1, which is formed by thermal spraying Al and / or Al alloy powder containing 5 to 40% by weight of Sn as the thermal spray raw material powder on the surface of the thermal spraying base material. 3. The thermal spray raw material powder further contains Si of 17 to
The thermal spray coating according to claim 2, wherein the thermal spray coating contains 50% by weight. 4. The thermal spray raw material powder is produced by an atomizing method, and contains 45 to 95% by weight of Al as a component and Sn.
5 to 40% by weight, and further 50% by weight or less of Si,
Includes either Mg 6 wt% or less, Cu 5 wt% or less, Zn 5 wt% or less, Mn 1 wt% or less, Fe 0.7 wt% or less, or Cr 0.35 wt% or less. The thermal sprayed coating according to claim 1 or 2, wherein 5. The particle size range of the thermal spraying raw material powder is from 10 to 10.
The thermal spray coating according to claim 4, which has a thickness of 150 μm. 6. The (A) atomizing method is used to prepare the thermal spraying raw material powder, which contains 50 to 90% by weight of Al as a component and S.
Powder containing 10 to 40% by weight of n, (B) produced by atomizing method, 50 to 95% by weight of Al, 50% by weight or less of Si, 6% by weight or less of Mg, and 5% by weight of Cu as components
Below, Zn is 5 wt% or less, Mn is 1 wt% or less, Fe
6. A mixed powder of 0.7% by weight or less and 0.35% by weight or less of Cr, which is a mixed powder.
Thermal spray coating. 7. The (A) powder 50 to 50 is used as the mixed powder.
The thermal spray coating according to claim 6, wherein 70% by weight and 30 to 50% by weight of the (B) powder are mixed. 8. The particle size range of the (A) powder is 30-15.
0 μm, the particle size range of the (B) powder is 10 to 150 μm
The thermal sprayed coating according to claim 6 or 7, wherein 9. A flame temperature of 1500 to 2800 ° C. and a flame velocity of 10 using propane gas, propylene gas, butane, ethane, ethylene, natural gas, hydrogen gas or kerosene as the combustion gas, and oxygen or air as the combustion supporting gas.
It is formed by forming a high-speed frame of 00 to 2500 m / sec, holding the spraying distance of 100 to 400 mm using this high-speed frame, and spraying a spraying raw material powder onto the surface of the base material to be sprayed. Item 9. The thermal spray coating according to any one of items 1 to 8. 10. An inert gas is heated to 300 ° C. or higher to form a high-speed jet at a speed of 1000 m / sec or higher, and the high-speed jet is used to spray a thermal spray raw material powder onto a base material to be sprayed. Claim 1 characterized by the above.
~ The thermal spray coating according to any one of items 8 to 8. 11. The thermal spray coating according to claim 1, wherein the thermal spray coating is formed on the surface of the thermal spraying substrate that has been roughened to have a roughness of μmRz = 25 to 90. 12. The thermal spray coating according to claim 1, which is formed on an equipment part made of an Al alloy, a Cu alloy, cast iron or a steel alloy. 13. The thermal spray coating according to claim 12, wherein the equipment component is a swash plate for an air compressor pump. 14. A method for forming a coating on the surface of a base material to be sprayed by spraying a spraying raw material powder onto the surface of the base material to be sprayed,
A method for forming a thermal spray coating, wherein Al and / or Al alloy powder containing 5 to 40% by weight of Sn is used as the thermal spray raw material powder. 15. The sprayed raw material powder further contains Si 17
15. The method for forming a thermal spray coating according to claim 14, wherein the thermal spray coating is contained in an amount of ˜50 wt%. 16. The thermal spray raw material powder is produced by an atomizing method, and contains 45 to 95% by weight of Al as a component and S.
5 to 40 wt% of n, 50 wt% or less of Si, 6 wt% or less of Mg, 5 wt% or less of Cu, 5 wt% or less of Zn, 1 wt% or less of Mn, and 0.7 of Fe. 15. The method for forming a thermal spray coating according to claim 14, characterized in that the content of Cr is 0.35 wt% or less. 17. The particle size range of the thermal spraying raw material powder is 10
The method for forming a thermal spray coating according to claim 16, wherein the thermal spray coating has a thickness of about 150 μm. 18. The thermal spraying raw material powder is produced by (A) atomizing method, and contains 50 to 90% by weight of Al as a component.
Powder containing Sn in an amount of 10 to 40% by weight, (B) produced by an atomizing method, and 50 to 95% by weight of Al as a component, Si
50 wt% or less, Mg 6 wt% or less, Cu 5 wt% or less, Zn 5 wt% or less, Mn 1 wt% or less, F
The method for forming a thermal spray coating according to claim 16 or 17, which is a mixed powder of powder containing 0.7% by weight or less of e and 0.35% by weight or less of Cr. 19. The mixed powder is the (A) powder 50.
˜70 wt%, and (B) powder 30 to 50 wt%,
19. The method for forming a thermal spray coating according to claim 18, wherein the thermal spray coating is formed by mixing 20. The mixed powder has a particle size range of the (A) powder of 30 to 150 μm and a particle size range of the (B) powder of 10 to 150 μm.
Alternatively, the method of forming the thermal spray coating of 19. 21. A flame temperature of 1500 to 2800 ° C. and a flame velocity of 1 using propane gas, propylene gas, butane, ethane, ethylene, natural gas, hydrogen gas or kerosene as a combustion gas, and oxygen or air as a supporting gas.
21. A high-speed frame of 000 to 2500 m / sec is formed, and the high-speed frame is used to hold a spraying distance of 100 to 400 mm to spray the raw material powder for thermal spraying onto the base material to be sprayed. The method for forming a thermal spray coating according to the above section. 22. An inert gas is heated to 300 ° C. or higher to form a high-speed jet at a speed of 1000 m / sec or higher, and the high-speed jet is used to spray the sprayed raw material powder onto the base material to be sprayed. A method for forming a thermal spray coating according to any one of claims 14 to 20. 23. The surface of the material to be sprayed on which the thermal spray coating is applied is roughened to have a roughness of μmRz = 25 to 90, and then the surface is sprayed. The method of forming a sprayed coating according to the item. 24. The base material to be sprayed is an Al alloy, a Cu alloy,
The method for forming a thermal spray coating according to any one of claims 14 to 23, which is an equipment part made of cast iron or a steel-based alloy. 25. The method for forming a thermal spray coating according to claim 24, wherein the equipment component is a swash plate for an air compressor pump. 26. Formed by an atomization method, containing 45 to 95% by weight of Al and 5 to 40% by weight of Sn as components, and further containing 50% by weight or less of Si, 6% by weight or less of Mg and 5% by weight of Cu. % Or less, Zn 5% by weight or less, Mn 1% by weight or less, Fe 0.7% by weight or less, Cr 0.3%
A thermal spray raw material powder containing any one of 5% by weight or less. 27. The particle size range of the thermal spraying raw material powder is 10
27. The thermal spray raw material powder according to claim 26, characterized in that 28. A powder produced by the atomizing method (A), containing 50 to 90% by weight of Al and 10 to 40% by weight of Sn as components, and (B) 50 to 95% of Al as the component produced by the atomizing method. % By weight, 50% by weight or less of Si, M
A mixture of g of 6 wt% or less, Cu of 5 wt% or less, Zn of 5 wt% or less, Mn of 1 wt% or less, Fe of 0.7 wt% or less, and Cr of 0.35 wt% or less. The thermal spray raw material powder according to claim 26 or 27, which is a powder. 29. The mixed powder is the (A) powder 50.
˜70 wt%, and (B) powder 30 to 50 wt%,
29. The thermal spraying raw material powder according to claim 28, characterized in that 30. The particle size range of the (A) powder is 30 to 1.
50 μm, the particle size range of the (B) powder is 10 to 150 μm
30. The thermal spraying raw material powder according to claim 28 or 29, characterized in that it is m.