CN111647765A - Method for improving apparent mass of AlV55 alloy - Google Patents

Abstract

The invention provides a method for improving the apparent quality of AlV55 alloy. The method comprises the following steps: step 1: mixing vanadium pentoxide and aluminum particle raw materials according to a certain ratio; step 2: pouring the mixed material into a In the reactor, the magnesium ribbon is ignited to trigger the reaction to carry out aluminothermic reduction smelting; step 3: water and/or air cooling the reactor; step 4: inert gas is introduced into the reactor for purging; step 5: cooling After that, the finished AlV55 alloy is obtained by sandblasting and crushing. Using the method of the invention to prepare the AlV55 alloy can improve the apparent quality of the AlV55 alloy, so that the vanadium content in the finished product can be controlled at 59% to 59.5%, and the alloy yield can be increased to more than 70%.

Description

A method for improving the apparent quality of AlV55 alloy

technical field

The invention relates to the field of metallurgy, in particular to a method for improving the apparent quality of AlV55 alloy.

Background technique

As an important additive of titanium alloys, vanadium-aluminum alloys are often used to improve the properties of titanium alloys, making them more advantageous in terms of strength, toughness, formability, corrosion resistance, and high temperature resistance. , important materials for automobile chassis parts, golf clubs and medical equipment.

With the rapid development of my country's economy and the continuous improvement of people's consumption level, my country's national defense strength and aerospace strength have been significantly enhanced, and titanium alloys used in the civil industry and aerospace fields have experienced a substantial growth momentum. my country mainly uses AlV55 alloy to prepare Ti-6Al-4V alloy, so the market demand is very large, but the apparent quality (especially yield) of AlV55 alloy prepared by one-step method is generally not high, although unqualified products can be returned to the furnace as The coolant loses little in total vanadium, but production costs remain high.

Based on this, the prior art still needs to be improved.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the embodiment of the present invention proposes a method for improving the apparent quality of AlV55 alloy, which can effectively solve the problems of low apparent quality and high cost of AlV55 alloy prepared by one-step method.

According to the present invention, a method for improving the apparent quality of AlV55 alloy is provided, the method comprising the following steps:

Step 1: Mix the vanadium pentoxide and the aluminum pellets evenly according to a certain ratio;

Step 2: pour the mixed material into the reactor, ignite the magnesium belt to trigger the reaction, and carry out aluminothermic reduction smelting;

Step 3: water-cooling and/or air-cooling the reactor;

Step 4: Purge inert gas into the reactor;

Step 5: After cooling, the finished AlV55 alloy is obtained by sandblasting and crushing.

According to an embodiment of the present invention, in step 1, the weight ratio of vanadium pentoxide to aluminum particles is 1.12:1 to 1.9:1.

According to an embodiment of the present invention, the particle size of vanadium pentoxide is less than or equal to 120 mesh, and the particle size of metal Al is less than or equal to 80 mesh.

According to an embodiment of the present invention, a certain amount of coolant may be added to the raw material in step 1.

According to an embodiment of the present invention, in step 3, water cooling and/or air cooling of the reactor is started 3 to 5 minutes after the completion of the reaction, and water cooling and/or air cooling are terminated after the temperature of the reactor reaches 80 to 100 _°C . .

According to an embodiment of the present invention, in step 3, water cooling is performed through a cooling water pipe spirally arranged on the outer periphery of the reactor, and the ratio of the diameter of the cooling water pipe to the diameter of the reactor is 1:20 to 1:10, and the cooling water The flow velocity is 0.5～1m/s.

According to an embodiment of the present invention, in step 3, air cooling is performed by one or more cooling fans arranged near the reactor.

According to an embodiment of the present invention, in step 4, immediately after the reaction is completed, an inert gas is introduced into the top of the molten pool of the reactor for purging, and the inert gas is introduced for a period of 5-8 hours.

According to an embodiment of the present invention, in step 4, the flow rate of the inert gas is maintained at 1-5 m ³ /h.

According to an embodiment of the present invention, step 3 and step 4 are performed simultaneously.

Adopting the above-mentioned technical scheme, the present invention at least has the following beneficial effects:

On the basis of one-step aluminothermic reduction, the present invention reduces the intake of impurity elements by using high-purity raw materials, adopts water cooling and/or air cooling to control the phase change of the alloy, and adopts inert gas purging to prevent oxidation and nitridation of the alloy. Thereby, the apparent quality of the AlV55 alloy is improved, especially the yield of the AlV55 alloy is increased to more than 70%. In addition, the method of the invention has the advantages of simple process, low equipment requirements and low cost, can prepare AlV55 alloy whose vanadium content is controlled at 59%-59.6% with high yield, and has broad market application prospects.

Description of drawings

FIG. 1 shows a process flow diagram of the method for improving the apparent quality of AlV55 alloy according to the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings.

The present invention provides a method for improving the apparent quality of AlV55 alloy, as shown in Figure 1, the method comprises the following steps:

Step 1: Mix vanadium pentoxide (V ₂ O ₅ ) and aluminum particles (Al) raw materials uniformly according to a certain ratio;

Step 2: pour the mixed material into the reactor, ignite the magnesium belt to trigger the reaction, and carry out aluminothermic reduction smelting;

Step 3: After the reaction is completed, water cooling and/or air cooling are performed on the reactor;

Step 4: after the completion of the reaction, inert gas is introduced into the reactor for purging;

Step 5: After cooling, the finished AlV55 alloy is obtained by sandblasting and crushing.

Wherein, in step 1, vanadium pentoxide with a purity of not less than 99%, Si ≤ 0.15%, Fe ≤ 0.07% and aluminum particles with a purity of not less than 99% are used, and the use of high-purity raw materials is conducive to controlling the concentration of impurity elements in the alloy. The quality of the AlV55 alloy meets the standard requirements. In step 1, the weight ratio of vanadium pentoxide and aluminum particles is 1.12:1 to 1.9:1, and excessive aluminum particles are used to form vanadium-aluminum alloys through fusion of aluminum particles and metal vanadium during the reduction reaction process. . In step 1, preferably, the particle size of vanadium pentoxide is less than or equal to 160 mesh, and the particle size of metal Al is less than or equal to 120 mesh; more preferably, the particle size of vanadium pentoxide is less than or equal to 120 mesh, and the particle size of metal Al is less than or equal to 80 mesh, so as to ensure that the raw materials are mixed Evenly, all materials are fully contacted, and the reaction is fully carried out.

Among them, in step 1, a certain amount of coolant can be added to reduce the unit charge heat of the aluminothermic reaction, so as to avoid serious splashing caused by too violent reaction, which helps to improve safety. Preferably, AlV55 defective products can be used as the coolant, which helps to reduce costs on the one hand and avoids the introduction of impurities on the other hand. However, the present invention is not limited thereto, and other conventional coolants in the art, such as lime or fluorite, can also be used.

Among them, in step 1, vanadium pentoxide and aluminum particles are weighed according to a certain ratio and then loaded into the material tank and mixed evenly. In this way, there is basically no loss of material during the mixing process, and the amount of material added can be accurately controlled. During the mixing process, the materials collide with each other to make the materials mix more evenly.

Wherein, in step 2, the mixed material is poured into the reactor, and after the magnesium ribbon is ignited to trigger the reaction, the mixed material reacts as follows in the reactor: 3V ₂ O ₅ +10Al=6V+5Ql ₂ O ₃ . In a specific embodiment, after the mixed material is poured into the reactor and flattened, the magnesium ribbon can be inserted into the material, and the reaction can be triggered by igniting the magnesium ribbon. Although in the above embodiment, the reaction is initiated by igniting the magnesium ribbon, the present invention is not limited to this, and other conventional methods in the art can be used to initiate the reaction, for example, the reaction is initiated by electric ignition of titanium wire.

Wherein, in step 3, water cooling and/or air cooling of the reactor is started 3 to 5 minutes after the completion of the reaction, so as to avoid the formation of a brittle phase in the alloy phase and ensure complete separation of the slag and gold. Specifically, the outer periphery of the reactor can be provided with a cooling water pipe in a spiral shape, the water inlet is located on the lower side, which is connected with the cooling water switch, and the water outlet is located on the upper side, which is connected with the cooling water discharge pipe, so that when water cooling is required, When the cooling water switch is turned on, the water enters the cooling water pipe from the water inlet on the lower side, surrounds the outer periphery of the reactor, and finally flows out from the water outlet on the upper side, thereby cooling the reactor. For effective water cooling, the ratio of the diameter of the cooling water pipe to the diameter of the reactor should be 1:20 to 1:10. For example, the diameter of the reactor is usually about 1 m, and the diameter of the cooling water pipe can be set to 5-10 cm at this time. The cooling water flow rate can be 0.5 to 1 m/s in order to effectively cool the reactor. One or more cooling fans may be provided near the reactor to facilitate air cooling of the reactor. For example, one cooling fan may be provided on opposite sides of the reactor, or two or more fans may be provided at intervals around the reactor, so as to further improve the cooling efficiency. In actual operation, one or more of the cooling fans can be selectively turned on for cooling as required. The water-cooling and/or air-cooling operation can be terminated after the reactor reaches 80-100 _°C , because it is basically impossible for the phase to change at this time, and only natural cooling is required, and there is no need to continue water-cooling and/or air-cooling. Continuing to do so would unnecessarily increase costs.

It should be noted here that whether the reaction is completed is judged by the presence or absence of splashing, the aluminothermic reaction is generally very violent, and there is splashing phenomenon, and the reaction time is usually a few minutes. End Time.

Wherein, in step 4, immediately after the reaction is completed, an inert gas is introduced into the melt of the reactor through a spray gun for purging, which helps to prevent air from entering the liquid alloy and causing oxidation and nitridation of the alloy. The inert gas introduced can be argon, helium, neon and the like. During the reaction, since a large amount of smoke and dust generated by the reaction can prevent the air from entering the liquid alloy, there is no need to introduce an inert gas during the reaction process. Therefore, inert gas should be introduced in time after the reaction is completed. The air outlet of the spray gun can be set at a distance of 5 to 10 cm from the liquid level of the melt, so as to effectively purge the melt. In addition, in order to further improve the effect of purging, rotary purging can be performed.

Wherein, in step 4, the inert gas is introduced for a period of 5-8 hours to ensure that the alloy is not oxidized and nitrided by air pollution. After the reaction is completed, the resulting liquid alloy begins to cool slowly. After cooling for 5 to 8 hours, the alloy on the outside has basically solidified. At this time, there is basically no risk of oxidation and nitridation, and the inert gas can be stopped. Reduce costs while avoiding waste. If the cooling time is insufficient and the inert gas flow is stopped prematurely, there is a greater risk of oxidation and nitridation of the alloy.

Wherein, in step 4, the flow rate of the inert gas is maintained at 1-5 m ³ /h to ensure that the alloy is not oxidized and nitrided by air pollution. There is an optimal range for the inert gas flow rate to be introduced. It should not be too small or too large. If it is too small, it will not prevent the oxidation and nitridation of the alloy. If it is too large, it will cause unnecessary waste and increase the cost.

It should be noted here that: the above steps 3 and 4 may be performed simultaneously, or step 3 may be performed first, followed by step 4, or step 4 may be performed first, and then step 3 may be performed.

Among them, in step 5, after the reaction is completed, cool down for 24 hours, take out the alloy cake from the reactor, and remove the corundum slag on the alloy cake. All sprayed off to minimize the loss of the alloy itself. Sand blasting can be iron sand and/or aluminum sand. The sandblasted alloy cake is then crushed to obtain the finished AlV55 alloy package. The vanadium content in the AlV55 alloy is controlled at 59% to 59.6%. At this time, the crystal phase of the alloy is more of a solid solution structure, and the brittle phase is relatively small. When the alloy is broken, less fine powder can be produced.

Specific examples of the present invention are given below.

Example 1

Weigh 150kg of high-purity V ₂ O ₅ (grain size: 120 mesh to 160 mesh) and 132.3 kg of high-purity metal Al (grain size: 80 mesh to 120 mesh), put them into a material tank, mix them evenly, and pour them into the reactor to ignite magnesium. With a trigger reaction, after the reaction is completed, 3 minutes are passed into cooling water, the diameter of the cooling water pipe is 10cm, the flow rate is 0.5m/s, and argon gas is blown into the protection at the same time, the gas flow rate is 5m ³ /h, the blowing time is 5h, and the reaction is opened after 24h The AlV55 alloy with a V content of 59.4% and a yield of 70.3% was obtained after sandblasting.

Example 2

Weigh 100kg of high-purity V ₂ O ₅ (grain size: ≤120 mesh) and 87.7kg of high-purity metal Al (grain size: 80 mesh to 120 mesh), put them into a material tank and mix them evenly, then pour them into the reactor, and ignite the magnesium belt to trigger Reaction, after the reaction is completed, 4min is passed into cooling water, the diameter of the cooling water pipe is 8cm, the flow rate is 0.8m/s, and argon is blown into the protection simultaneously, the gas flow is 3m ³ /h, the blowing time is 7h, and the reactor is opened after 24h, After sandblasting, AlV55 alloy with V content of 59.2% and yield of 70.7% was obtained.

Example 3

Weigh 200kg of high-purity V ₂ O ₅ (grain size: 120 mesh to 160 mesh) and 176 kg of high-purity metal Al (grain size: ≤80 mesh), put them into a material tank and mix them evenly, pour them into the reactor, and ignite the magnesium belt to trigger the reaction , 5min after the completion of the reaction into cooling water, the diameter of the cooling water pipe is 5cm, and the flow rate is 1m/s. Argon was blown for protection, the gas flow was 1 m ³ /h, the blowing time was 8 h, and the reactor was opened after 24 h. After sandblasting, AlV55 alloy with V content of 59.5% and yield of 71.3% was obtained.

Example 4

Weigh 100kg of high-purity V ₂ O ₅ (grain size: ≤ 120 mesh) and 87.7 kg of high-purity metal Al (grain size: ≤ 120 mesh), put it into a material tank and mix it evenly, pour it into the reactor, ignite the magnesium belt to trigger the reaction, After the reaction was completed, ⁴ minutes were passed into cooling water, the diameter of the cooling water pipe was 8cm, the flow rate was 0.8m/s, and argon was blown into the protection at the same time. After the treatment, an AlV55 alloy with a V content of 59.3% and a yield of 70.8% was obtained.

Example 5

Weigh 100kg of high-purity V ₂ O ₅ (grain size: ≤ 120 mesh) and 52.6 kg of high-purity metal Al (grain size: ≤ 120 mesh), put it into a material tank and mix it evenly, pour it into the reactor, ignite the magnesium belt to trigger the reaction, After the reaction was completed, ⁴ minutes were passed into cooling water, the diameter of the cooling water pipe was 8cm, the flow rate was 0.8m/s, and argon was blown into the protection at the same time. After the treatment, an AlV55 alloy with a V content of 59.5% and a yield of 70.6% was obtained.

It can be seen from the above examples that the preparation of AlV55 alloy by the method of the present invention can improve the apparent quality of the AlV55 alloy, the V content can be controlled at 59% to 59.5%, and the yield of the AlV55 alloy can be increased to more than 70%. It should be noted here that the term "alloy yield" in the present invention is defined as: alloy yield=weight of packaged finished product/weight of alloy cake×100%.

The above are exemplary embodiments disclosed in the present invention, and the order disclosed in the above embodiments of the present invention is only for description, and does not represent the advantages or disadvantages of the embodiments. However, it should be noted that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope of the disclosure (including the claims) of the embodiments of the present invention is limited to these examples. Various changes and modifications are made. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements disclosed in the embodiments of the present invention may be described or claimed in the singular, unless explicitly limited to the singular, the plural may also be construed.

Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope (including the claims) disclosed by the embodiments of the present invention is limited to these examples; under the idea of the embodiments of the present invention , technical features in the above embodiments or different embodiments may also be combined, and there are many other variations of the different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention should be included within the protection scope of the embodiments of the present invention.

Claims (10)

1. A method for improving the apparent mass of an AlV55 alloy, which is characterized by comprising the following steps:

step 1: mixing vanadium pentoxide and aluminum particle raw materials uniformly according to a certain proportion;

step 2: pouring the mixed materials into a reactor, igniting a magnesium strip to trigger reaction, and carrying out aluminothermic reduction smelting;

and step 3: carrying out water cooling and/or air cooling on the reactor;

and 4, step 4: introducing inert gas into the reactor for purging;

and 5: and after cooling, performing sand blasting and crushing treatment to obtain an AlV55 alloy finished product.

2. The method for improving the apparent mass of the AlV55 alloy according to claim 1, wherein in step 1, the weight ratio of vanadium pentoxide to aluminum particles is 1.12: 1-1.9: 1.

3. The method for improving the apparent mass of the AlV55 alloy according to claim 1, wherein the particle size of vanadium pentoxide is less than or equal to 120 meshes, and the particle size of metallic Al is less than or equal to 80 meshes.

4. The method for improving the apparent mass of the AlV55 alloy according to claim 1, wherein a coolant is added to the raw materials in step 1.

5. The method for improving the apparent mass of the AlV55 alloy according to claim 1, wherein in step 3, the water cooling and/or air cooling of the reactor is started 3-5 min after the reaction is completed, and the water cooling and/or air cooling is finished after the temperature of the reactor reaches 80-100 ℃.

6. The method for improving the apparent mass of the AlV55 alloy according to claim 1, wherein in step 3, the water cooling is performed through cooling water pipes spirally arranged on the periphery of the reactor, and the diameter ratio of the cooling water pipes to the reactor is 1: 20-1: 10, the flow rate of the cooling water is 0.5 to 1 m/s.

7. The method for improving the apparent mass of the AlV55 alloy according to claim 1, wherein in step 3, the air cooling is performed by one or more cooling fans disposed near the reactor.

8. The method for improving the apparent mass of the AlV55 alloy according to claim 1, wherein in step 4, the inert gas is introduced into the upper part of the molten pool of the reactor for purging immediately after the reaction is finished, and the inert gas introduction time is 5-8 h.

9. The method for improving the apparent mass of the AlV55 alloy according to claim 1, wherein in step 4, the inert gas flow is kept at 1-5 m³/h。

10. The method for improving the apparent mass of the AlV55 alloy according to claim 1, wherein step 3 and step 4 are performed simultaneously.

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