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Metal self-lubricating composite material

A composite material and self-lubricating layer technology, which is applied in the field of bimetallic self-lubricating composite materials and its preparation, can solve the problems of wear-resistant materials such as reduced hardness, large sliding friction resistance, and reduced mechanical properties, so as to reduce stress Effects of concentration, increase of contact area, and increase of surface area

Inactive Publication Date: 2002-09-04
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the sliding parts made of it, when the graphite content is low, under the conditions of dry friction and high temperature, the sliding friction resistance is large, the temperature rises, the wear is severe, and even the shaft is stuck, etc., even under the condition of water vapor or water lubrication When the graphite content is high, the anti-friction performance and temperature rise are greatly improved, but the mechanical properties are greatly reduced, and even the wear resistance is also affected by the decrease in material hardness and other properties. certain adverse effects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: 1) According to weight percent composition, it is composed of copper-plated graphite powder 6.5%, lead oxide powder: 4%, tin powder: 6%, and the balance of tin bronze powder is weighed and the materials are mixed and evenly spread on the copper-plated steel back , thickness 0.5 ~ 10mm, in hydrogen atmosphere, sintering at 700 ~ 800 ℃, heat preservation 30 ~ 60min, cooling. 2) Pass hydrogen protection, carry out the second sintering, the sintering temperature is 700-800 ℃, keep warm for 30-60min, and cool down.

[0014] Use result:

[0015] Sliding bearings made of this material can be used in dry friction or in water vapor, water, gas, and at high temperatures of -200-400°C. The performance reaches or exceeds that of similar imported materials. The test on steam turbines fully meets the practical requirements.

Embodiment 2

[0017] The self-lubricating layer is composed of 8% by weight of copper-plated graphite powder, 3% of lead oxide powder, 9% of tin powder, and the balance of tin bronze powder. The preparation method is the same as in Example 1.

Embodiment 3

[0019] The self-lubricating layer is composed of 10% by weight of copper-plated graphite powder, 6% of lead oxide powder, 4% of tin powder, and the balance of tin bronze powder. The preparation method is the same as in Example 1.

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PUM

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Abstract

The present invention discloses a metal self-lubricaitng compound material and its preparation method. Its preparation process includes the following steps: uniformly mixing tin bronze, copper-platedgraphite, tin powder and lead oxide powder according to a certain proportion, then sintering a layer of self-lubricating layer on the copper-plated steel back. The said material is applicable to high-load long-life use in aqueous vapour, water and gas at -200-400 deg.C, and mainly is used for making bearing material in the dry friction or the low-viscosity fluid of chemical solution, etc.

Description

[0001] Field [0002] The invention describes a bimetal self-lubricating composite material with low friction, high wear resistance and high mechanical strength, which is suitable for high load, long life, water vapor, water, gas and high temperature of -200~400 ℃ and its its preparation method. This type of material is mainly used for dry friction or bearing materials used in low-viscosity fluids such as chemical solutions. Background technique [0003] Graphite-copper matrix composites produced by powder metallurgy are important bearing materials because of their excellent anti-friction and wear resistance, high temperature resistance, oxidation resistance and corrosion resistance. However, due to the sliding parts made of it, when the graphite content is low, under the conditions of dry friction and high temperature, the sliding friction resistance is large, the temperature rises, the wear is severe, and even the shaft is stuck, etc., even under the condition of water vapo...

Claims

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Application Information

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IPC IPC(8): B22F7/04C22C1/05C22C1/10C22C9/00
Inventor 宁莉萍简令奇王齐华杨生荣王宏刚张国强薛群基
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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