Method for powder metallurgy preparation of self-lubricating bearing material

A self-lubricating bearing and powder metallurgy technology, applied in bearing components, shafts and bearings, mechanical equipment, etc., can solve the problems of low production efficiency, high price and high cost, reduce tool wear, low price and easy parameter control. Effect

Inactive Publication Date: 2013-12-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For iron-based self-lubricating bearings, there are few solid lubricants that can withstand high sintering temperatures without losing wetting properties, and there are certain deficiencies or shortcomings, such as easy oxidation in high temperature environments, low production efficiency, high cost, and high price And other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A self-lubricating bearing material is composed as follows by weight percentage:

[0028] FeS 2 5%, FeMn15%, Cu5%, C1%, the balance is iron powder;

[0029] Step 1: Weigh iron powder with an average particle size of 100 μm, iron sulfide powder of 100 μm, ferromanganese powder of 200 μm, and copper powder of 100 μm and mix them in a rolling ball mill for 8 hours;

[0030] Step 2: Anneal the mixed powder in a hydrogen furnace, the annealing process is: 700°C, 2h;

[0031] Step 3: Mix the annealed powder and 100 μm graphite powder on a rolling ball mill for 4 hours;

[0032] Step 4: Put the composite powder into the sleeve mold for pressing, the pressing pressure is 650MPa, and the pressure is maintained for 2 minutes;

[0033] Step 5: Put the compact in N 2 Sintering at 1100°C for 1 hour under a protective atmosphere to obtain bearing samples;

[0034] Step 6: Surface grinding, deburring, chamfering and other treatments are performed on the bearing sample to obtain a...

Embodiment 2

[0036] A self-lubricating bearing material is composed as follows by weight percentage:

[0037] FeS 2 15%, FeMn10%, Cu5%, Ni5%, C3%, the balance is iron powder;

[0038] Step 1: Weigh iron powder with an average particle size of 200 μm, iron sulfide powder with 200 μm, ferromanganese powder with 300 μm, copper powder with 100 μm, and nickel powder with 200 μm, put them into rolling ball mill and mix them for 2 hours;

[0039] Step 2: Anneal the mixed powder in a hydrogen furnace, the annealing process is: 900°C, 1h;

[0040] Step 3: Mix the annealed powder and 100 μm graphite powder on a rolling ball mill for 12 hours;

[0041] Step 4: Put the composite powder into the sleeve mold for pressing, the pressing pressure is 400MPa, and the pressure is maintained for 3 minutes;

[0042] Step 5: Put the compact in N 2 Sintering at 1200°C for 2 hours under a protective atmosphere to obtain bearing samples;

[0043] Step 6: Surface grinding, deburring, chamfering and other treatm...

Embodiment 3

[0045] A self-lubricating bearing material is composed as follows by weight percentage:

[0046] FeS 2 10%, FeMn20%, Mo4%, Ni3%, Cr1%, C2%, the balance is iron powder;

[0047] Step 1: Weigh iron powder with an average particle size of 100 μm, iron sulfide powder of 100 μm, ferromanganese powder of 100 μm, molybdenum powder of 200 μm, nickel powder of 200 μm, and chromium powder of 200 μm, and mix them on a rolling ball mill for 5 hours;

[0048] Step 2: Anneal the mixed powder in a hydrogen furnace, the annealing process is: 600°C, 3h;

[0049] Step 3: Mix the annealed powder and 300 μm graphite powder on a rolling ball mill for 6 hours;

[0050] Step 4: Put the composite powder into the sleeve mold for pressing, the pressing pressure is 550MPa, and the pressure is maintained for 2 minutes;

[0051] Step 5: Sinter the compact at 1000°C for 1.5h under an Ar protective atmosphere to obtain a bearing sample;

[0052] Step 6: Surface grinding, deburring, chamfering and other ...

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Abstract

The invention discloses a method for powder metallurgy preparation of a self-lubricating bearing material, belonging to the field of lubricating materials. According to the method, a traditional powder metallurgy method is adopted, and the method comprises the following steps of: mixing and annealing iron powder with an appropriate amount of iron sulfide, ferromanganese powder and alloy powder; mixing the annealed powder with an appropriate amount of graphite; pressing and sintering to obtain the self-lubricating bearing material. The raw materials are inexpensive, the process is simple, the parameters are easy to control, and the production process is safe and environment-friendly, so that the method is suitable for large-scale industrial production. In the annealing process, the mixed powder reacts to generate FeS and MnS, and good lubricating and antifriction effects are achieved; meanwhile, the existence of MnS can significantly improve the cutting performance of the bearing material and reduce the abrasion of a cutter. The self-lubricating bearing material prepared by the method disclosed by the invention can be widely applied to mechanical equipment for iron and steel, metallurgy, energy sources and the like, and is particularly suitable for occasions requiring oil-free lubrication.

Description

technical field [0001] The invention belongs to the field of lubricating materials and provides a powder metallurgy preparation method for self-lubricating bearing materials. Background technique [0002] Powder metallurgy self-lubricating bearings, also known as sintered metal oil-impregnated bearings, are an indispensable type of bearings in audio-visual equipment, micro and small motors, office machinery, electric tools, washing machines, electric fans, sewing machines, copiers, etc. It is to add the solid lubricant in the form of powder as a component to the metal matrix raw material, form a self-lubricating composite material through pressing and sintering, and use it as a bearing, bearing bush or liner. Because the material itself contains solid lubricant, the solid lubricant of the bearing forms a relatively stable lubricating film on the relative sliding surface due to thermal action and friction during the movement, and it is constantly replenished and provided by i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C33/02F16C33/12F16C33/14
Inventor 郭志猛郭雷辰杨芳陈存广石韬叶青芦博昕
Owner UNIV OF SCI & TECH BEIJING
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