CN115109408A - Preparation method of polyamide imide based composite thrust bearing suitable for oil lubrication working condition - Google Patents
Preparation method of polyamide imide based composite thrust bearing suitable for oil lubrication working condition Download PDFInfo
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- 239000004962 Polyamide-imide Substances 0.000 title claims abstract description 36
- 229920002312 polyamide-imide Polymers 0.000 title claims abstract description 35
- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 238000005461 lubrication Methods 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003365 glass fiber Substances 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 239000011787 zinc oxide Substances 0.000 claims abstract description 15
- 238000001746 injection moulding Methods 0.000 claims abstract description 9
- 238000007580 dry-mixing Methods 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 6
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/201—Composition of the plastic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/208—Methods of manufacture, e.g. shaping, applying coatings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/02—Plastics; Synthetic resins, e.g. rubbers comprising fillers, fibres
- F16C2208/04—Glass fibres
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- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
- F16C2208/40—Imides, e.g. polyimide [PI], polyetherimide [PEI]
- F16C2208/42—Polyamideimide [PAI]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2220/00—Shaping
- F16C2220/02—Shaping by casting
- F16C2220/04—Shaping by casting by injection-moulding
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
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- Organic Chemistry (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a preparation method of a polyamide imide composite thrust bearing suitable for oil lubrication working conditions, wherein the thrust bearing has low friction and abrasion under boundary and mixed lubrication conditions. The preparation method comprises the steps of putting 69-94% of polyamide imide powder, 5-30% of ground glass fiber and 1-7% of zinc oxide nanoparticles in a high-speed stirrer for dry mixing, using a double-screw extruder for high-temperature melting and mixing, extruding and granulating, and carrying out injection molding on the granules by a high-pressure injection machine. The glass fiber in the composite system improves the wear resistance of the thrust bearing, and the zinc oxide promotes the formation of a lubricating characteristic boundary reaction film on the surface of the metal pair, thereby obviously prolonging the service life of a moving part and improving the reliability of the system. The polyamide imide-based composite thrust bearing has important application potential in the fields of high-torque transmission equipment, automobile engines, high-speed hydraulic systems and the like.
Description
Technical Field
The invention relates to a preparation method of a glass fiber and zinc oxide composite modified polyamide imide composite thrust bearing, which can be applied to the field of equipment such as automobile engines, high-torque reduction boxes, hydraulic transmission and the like. Belongs to the field of polymer composite materials.
Background
With the rapid development of related technologies in the fields of high-torque transmission equipment, automobile engines, high-speed hydraulic systems and the like, the service working condition of the sliding thrust bearing is more and more rigorous. Particularly, the friction interface between the sliding thrust bearing and the main shaft is often in a mixed lubrication or even boundary lubrication region due to extreme working conditions such as frequent start-stop, high speed and heavy load of modern equipment, and new challenges are provided for the reliability and the service life of the conventional mechanical parts, particularly the thrust bearing which plays a key bearing role in a transmission system. The polymer composite material has the advantages of small density, high specific strength, designable performance, self-lubrication, good corrosion resistance and the like, and is increasingly widely applied in the high-technology industrial field. The optimally designed polymer composite material-metal friction pair is used for replacing the conventional metal-metal friction, so that the service life of the motion mechanism can be effectively prolonged, the energy consumption of the system is reduced, and a new idea is provided for solving the material design and manufacture of the thrust bearing. The polyamide-imide as an engineering plastic with excellent performance has excellent mechanical properties, outstanding thermal stability, radiation resistance and other properties, and is widely applied to the fields of high-end equipment such as automobiles, aviation, aerospace, ships and the like. However, when the non-composite modified polyamide-imide material is used as a thrust bearing material, the bearing capacity is low, the self-lubricating and abrasion-resistant properties are poor, the use requirement under severe conditions is difficult to meet, and the tribological functional design is required.
The polyimide composite material applicable to thrust bearings in the prior patent is mainly designed by optimizing the dry friction working condition, wherein the material is not necessarily suitable for application under the oil lubrication working condition. The related patents are: 200510027062.2 nanometer Al 2 O 3 Preparation method of polyimide friction composite material sliding bearing and 2011103694720-a polyimide self-lubricating composite material.
Based on the analysis of the service conditions of key bearing parts such as a sliding thrust bearing under the oil lubrication condition in high-torque transmission equipment, an automobile engine and a high-speed hydraulic system, the bearing capacity and the wear resistance of the polyamide imide-based composite thrust bearing can be effectively improved through reasonable material design and processing technology.
Disclosure of Invention
The invention aims to provide a preparation method of a polyamide imide composite thrust bearing suitable for an oil lubrication working condition, wherein the thrust bearing has excellent friction reduction and wear resistance, excellent dimensional stability and corrosion resistance under the oil lubrication working conditions of high speed and heavy load.
The object of the invention is achieved by the following measures:
according to the invention, the load-bearing capacity and the wear resistance of the composite material are improved by adding the reinforcing phase glass fiber into the polyamide-imide matrix, and the forming speed and the lubricating property of the metal dual surface boundary reaction film are improved by adding the nano zinc oxide particles, so that the stable boundary reaction film with excellent performance is quickly formed on a friction surface. In the using process, the composite material ensures the long-acting property and the stability of the polyamide imide composite material thrust bearing-metal friction pair through the synergistic action of the composite material and lubricating oil. The polyamide imide composite thrust bearing is manufactured by a reasonable extrusion injection molding process.
A preparation method of a polyamide imide based composite thrust bearing suitable for oil lubrication working conditions comprises the following steps:
(1) putting polyamide imide with the volume fraction of 69-94%, glass fiber with the volume fraction of 5-30% and zinc oxide particles with the volume fraction of 1-7% into a high-speed stirrer, and carrying out dry mixing; the polyamide imide is a thermoplastic polyamide imide powder material, and the particle size is 75-150 mu m; the glass fiber is chopped glass fiber, the diameter of a monofilament is 5-30 mu m, and the length of the monofilament is 50-300 mu m; the nano zinc oxide is nano particles, and the particle size is 20-300 nm;
(2) carrying out high-temperature melting and mixing on the mixture by adopting a double-screw extruder, and extruding and granulating; the processing parameters of the double-screw extruder are that the heating temperature of the 1-3 area is 320-360 ℃, the heating temperature of the 4-6 area is 360-370 ℃, the heating temperature of the 7-9 area is 370-380 ℃, and the rotation speed of the screw is 200-;
(3) carrying out injection molding on the uniformly melted and mixed extruded granules by a high-pressure injection machine; the temperature of the mold of the injection machine is 180-230 ℃, the temperature of the rear area of the injection tube is 300-320 ℃, the temperature of the middle area is 320-340 ℃, the temperature of the front area is 340-360 ℃, the temperature of the nozzle is 360-380 ℃, and the rotating speed of the screw is 50-100 r/min.
Compared with the prior art, the invention has the following advantages:
the invention considers the effects of different components and the synergistic effect among the components in the design of material structure and performance. The material of the invention consists of a polymer matrix, a reinforcing phase and a functional filler. The selected polyamide-imide matrix has excellent mechanical properties, outstanding thermal stability, radiation resistance, corrosion resistance and other properties; the selected glass fiber has the characteristics of strong heat resistance, good corrosion resistance, high mechanical strength, good wear resistance and the like. Under the boundary and mixed lubrication states, the glass fiber improves the wear resistance of the polyamide-imide matrix, and the zinc oxide promotes the friction chemical reaction in the friction process, so that a boundary reaction film with excellent lubrication performance is formed on the surface of the metal pair, the friction and the wear of the moving part are reduced, the service life of the moving part is obviously prolonged, and the reliability of the system is improved. The polyamide imide based composite thrust bearing provided by the invention is simple in preparation process, and has higher reliability and service life compared with the traditional metal material and polyamide imide composite material.
Drawings
FIG. 1 is a bar graph of the coefficient of friction of comparative example 1 and example 1;
FIG. 2 is a bar graph of the wear rates of comparative example 1 and example 1 materials.
Detailed Description
The present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the present invention, and all similar methods and similar variations using the present invention are intended to be included within the scope of the present invention.
Comparative example 1
A preparation method of a pure polyamide-imide thrust bearing; the polyamideimide powder was dried in an air-blast drying oven at 177 ℃ for 3 hours. And (3) injection molding the dried material by a high-pressure injection machine, wherein the mold temperature is 180 ℃, the injection tube rear region temperature is 310 ℃, the middle region temperature is 320 ℃, the front region temperature is 340 ℃, the nozzle temperature is 370 ℃, and the screw rotation speed is 50 r/min.
Example 1
An implementation method of a polyamide imide based composite thrust bearing suitable for oil lubrication working conditions comprises the following steps: the volume components of the raw materials are 85 percent of polyamide-imide, 10 percent of glass fiber and 5 percent of zinc oxide. First, the polyamideimide was dried in an air-blast drying oven at 177 ℃ for 3 hours, and the zinc oxide and the glass fiber were dried at 100 ℃ for 3 hours. Placing the raw materials with the volume fractions in a high-speed stirrer, and performing primary dry mixing; the mixture is subjected to high-temperature melting and mixing by adopting a double-screw extruder, the extruder is heated in nine sections, the heating temperature is 320/340/350 ℃ in a region from a feed inlet to a discharge outlet, the heating temperature is 360/365/370 ℃ in a region from 4 to 6, the heating temperature is 370/375/380 ℃ in a region from 7 to 9, and the rotating speed of the screw is 200 r/min. And (3) carrying out injection molding on the uniformly melted and mixed extrusion material by a high-pressure injection machine, wherein the temperature of a mold is 180 ℃, the temperature of a rear region of an injection cylinder is 310 ℃, the temperature of a middle region is 320 ℃, the temperature of a front region is 340 ℃, the temperature of a nozzle is 370 ℃, and the rotating speed of a screw is 50 r/min.
Example 2
An implementation method of a polyamide imide composite thrust bearing suitable for an oil lubrication working condition comprises the following steps: the volume components of the raw materials are 70% of polyamide-imide, 23% of glass fiber and 7% of zinc oxide. First, the polyamideimide was dried in an air-blast drying oven at 177 ℃ for 3 hours, and the zinc oxide and the glass fiber were dried at 100 ℃ for 3 hours. Placing the raw materials with the volume fractions in a high-speed stirrer, and performing primary dry mixing; the mixture is subjected to high-temperature melting and mixing by adopting a double-screw extruder, the extruder is heated in nine sections, the heating temperature is 320/350/350 ℃ in a region from a feed inlet to a discharge outlet, the heating temperature is 360/365/365 ℃ in a region from 4 to 6, the heating temperature is 370/380/380 ℃ in a region from 7 to 9, and the rotating speed of the screw is 250 r/min. And (3) carrying out injection molding on the uniformly melted and mixed extrusion material by a high-pressure injection machine, wherein the temperature of a mold is 180 ℃, the temperature of a rear region of an injection cylinder is 310 ℃, the temperature of a middle region is 320 ℃, the temperature of a front region is 340 ℃, the temperature of a nozzle is 370 ℃, and the rotating speed of a screw is 50 r/min.
Example 3
An implementation method of a polyamide imide composite thrust bearing suitable for an oil lubrication working condition comprises the following steps: the volume components of the raw materials are 90% of polyamide-imide, 8% of glass fiber and 2% of zinc oxide. First, the polyamideimide was dried in an air-blast drying oven at 177 ℃ for 3 hours, and the zinc oxide and the glass fiber were dried at 100 ℃ for 3 hours. Placing the raw materials with the volume fractions in a high-speed stirrer, and performing primary dry mixing; the mixture is subjected to high-temperature melting and mixing by adopting a double-screw extruder, the extruder is heated by nine sections, the heating temperature from the feed inlet to the discharge outlet is 320/340/350 ℃ in a region of 1-3, the heating temperature from 4-6 is 360/365/370 ℃, the heating temperature from 7-9 is 370/375/380 ℃, and the rotation speed of the screws is 200 r/min. And (3) carrying out injection molding on the uniformly melted and mixed extrusion material by a high-pressure injection machine, wherein the temperature of a mold is 200 ℃, the temperature of a rear region of an injection cylinder is 320 ℃, the temperature of a middle region is 330 ℃, the temperature of a front region is 350 ℃, the temperature of a nozzle is 380 ℃, and the rotating speed of a screw is 80 r/min.
The injection molding thrust bearing samples of the embodiment 1 and the comparative example 1 are processed into sample blocks of 50mm multiplied by 10mm multiplied by 4 mm; the coupons of example 1 and comparative example 1 were each subjected to frictional wear performance analysis under oil immersion conditions on a ring-and-block frictional wear tester. The test conditions were: metal pair GCr15 test ring, initial surface roughness Ra: 0.2-0.4 mu m, synthetic base oil PAO4 as a lubricating medium, 30mm of friction radius, 300N of test load, 0.05m/s and 0.2m/s of sliding speed and 180min of friction and wear test time.
As can be seen from FIGS. 1 and 2, when the sliding speed was 0.05m/s, the friction coefficient of example 1 was 0.072 and the wear rate was 6.74X 10 -7 mm 3 The friction coefficient is reduced by 23 percent and the wear rate is reduced by 50 percent compared with the friction and wear performance of the comparative example 1 under the same conditions; when the sliding speed isAt 0.2m/s, the friction coefficient of example 1 was 0.033 and the wear rate was 1.2X 10 -7 mm 3 In Nm, the friction coefficient is reduced by 62% and the wear rate is reduced by 83% compared to the friction and wear performance of comparative example 1 under the same conditions.
Claims (6)
1. A preparation method of a polyamide imide based composite thrust bearing suitable for oil lubrication working conditions is characterized by comprising the following steps:
(1) putting polyamide imide with the volume fraction of 69-94%, glass fiber with the volume fraction of 5-30% and zinc oxide particles with the volume fraction of 1-7% into a high-speed stirrer, and carrying out dry mixing;
(2) carrying out high-temperature melting and mixing on the mixture by adopting a double-screw extruder, and extruding and granulating;
(3) and (3) carrying out injection molding on the uniformly melted and mixed extruded granules by a high-pressure injection machine.
2. The method according to claim 1, wherein the polyamideimide is a thermoplastic polyamideimide powder having a particle size of 75 to 150 μm.
3. The method according to claim 1, wherein the glass fiber is a ground glass fiber, and the filament has a diameter of 5 to 20 μm and a length of 50 to 200 μm.
4. The method according to claim 1, wherein the nano zinc oxide is a nanoparticle having a particle size of 20 to 300 nm.
5. The method for preparing the thermoplastic elastomer composition according to claim 1, wherein the twin-screw extruder has processing parameters of 350 to 360 ℃ for heating in a zone 1 to 3, 370 to 370 ℃ for heating in a zone 4 to 6, 370 to 380 ℃ for heating in a zone 7 to 9, and 200 to 250r/min for screw rotation.
6. The method according to claim 1, wherein the temperature of the mold of the injection machine is 180 to 230 ℃, the temperature of the rear region of the injection tube is 300 to 320 ℃, the temperature of the middle region is 320 to 340 ℃, the temperature of the front region is 340 to 360 ℃, the temperature of the nozzle is 360 to 380 ℃, and the rotation speed of the screw is 50 to 100 r/min.
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| CN202110539417.5A CN115109408A (en) | 2021-05-17 | 2021-05-17 | Preparation method of polyamide imide based composite thrust bearing suitable for oil lubrication working condition |
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| CN202110539417.5A CN115109408A (en) | 2021-05-17 | 2021-05-17 | Preparation method of polyamide imide based composite thrust bearing suitable for oil lubrication working condition |
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| CN202110539417.5A Pending CN115109408A (en) | 2021-05-17 | 2021-05-17 | Preparation method of polyamide imide based composite thrust bearing suitable for oil lubrication working condition |
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| CN (1) | CN115109408A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1727408A (en) * | 2005-07-22 | 2006-02-01 | 南京工业大学 | self-lubricating bearing material and preparation method thereof |
| CN1894518A (en) * | 2003-12-12 | 2007-01-10 | 卢克摩擦片和离合器两合公司 | Friction material |
| WO2015081363A2 (en) * | 2013-12-05 | 2015-06-11 | Miba Gleitlager Gmbh | Sliding bearing |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1894518A (en) * | 2003-12-12 | 2007-01-10 | 卢克摩擦片和离合器两合公司 | Friction material |
| CN1727408A (en) * | 2005-07-22 | 2006-02-01 | 南京工业大学 | self-lubricating bearing material and preparation method thereof |
| WO2015081363A2 (en) * | 2013-12-05 | 2015-06-11 | Miba Gleitlager Gmbh | Sliding bearing |
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Application publication date: 20220927 |