Metal-based self-lubricating composite material and preparation method thereof

A composite material and metal technology, applied in the field of metal-based self-lubricating composite materials and their preparation, can solve problems such as weak interfacial bonding force and graphite segregation, and achieve uniform distribution, good mechanical properties and friction properties, and reduce costs.

Inactive Publication Date: 2010-10-27
DALIAN HONGRUN COMPOSITE BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the weak interfacial bonding force and graphite segregation problems of existing copper-based gra

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Pre-sinter a layer of spherical bronze powder on the steel substrate. The composition is 6% copper-coated graphite powder and 94% lead-free bronze powder. After mixing evenly by mechanical high-speed stirring, it is coated on the surface of the substrate with a thickness of 5mm.

[0020] (2) Sintering and molding in a sintering furnace with decomposed ammonia gas as a protective atmosphere, at a temperature of 700-850°C, keeping it warm for 1 hour, and then performing rolling treatment.

[0021] (3) Refire in a sintering furnace with decomposed ammonia gas as a protective atmosphere, keep it warm at a temperature of 700-850°C for 1 hour, and then level it and shape it after cooling.

Embodiment 2

[0023] Select 8% copper-coated graphite powder and 92% lead-free bronze powder for use, and the preparation method is the same as in Example 1.

Embodiment 3

[0025] Select 8% copper-coated graphite powder, 91% lead-free bronze powder and 1% nano silicon dioxide, and the preparation method is the same as that in Example 1.

[0026] The friction and wear properties of the products prepared by the above formula and process are shown in Table 1, and the mechanical properties are shown in Table 2.

[0027] Table 1 Friction and wear performance parameters

[0028] Experimental conditions

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PUM

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Abstract

The invention discloses a metal-based self-lubricating composite material, comprising the following components by weight percent: 4-10 percent of copper-plated graphite powder and 90-96 percent of bronze powder, wherein the proportion of copper and graphite in the copper-plated graphite powder is 30-50 percent of copper and 50-70 percent of graphite. A preparation method of the metal-based self-lubricating composite material comprises the steps that: a layer of spherical bronze powder is pre-sintered on a steel matrix, mixing the copper-plated graphite powder and the bronze powder according to the proportion, the mixture is stirred and then is uniformly coated on the surface of the matrix, hydrogen is taken as protective atmosphere, pre-sintering and forming are carried out, then re-sintering is carried out after rolling treatment, and the temperature schedule for the pre-sintering and re-sintering is as follows: the temperature is kept for 0.5-1 hour at the temperature of 700-850 DEG C. The high-strength and wear-resistant metal-based self-lubricating composite material has even distribution, good interface bonding, and the whole material integrates the good mechanical performance and wear resistance. Simultaneously, the use of the composite material can save a great amount of non-ferrous metal material, reduce the cost; and in addition, the composite material does not contain lead, is green and environment-friendly and can be used for manufacturing self-lubricating sliding bearings and chute boards.

Description

technical field [0001] The invention relates to the field of self-lubricating composite materials, in particular to a metal-based self-lubricating composite material and a preparation method thereof. Background technique [0002] Stone mill has many excellent properties such as high electrical conductivity, thermal conductivity, lubricity, high temperature strength and high melting point (non-melting at normal pressure, direct sublimation at 3500 ° C), so it is widely used, especially composite materials made with metals, This is a hot topic of current research. Due to its good anti-friction and anti-seizure properties, it can be used as new materials and conductive materials for various bearings and sliding parts, such as copper-graphite composite materials, aluminum-silicon-copper-graphite composite materials, etc. [0003] Taking copper-graphite composite material as an example, copper-graphite composite material has good electrical conductivity, thermal conductivity and...

Claims

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Application Information

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IPC IPC(8): C22C9/00C22C1/10B22F7/04
Inventor 刘利利王述仁于日鸿
Owner DALIAN HONGRUN COMPOSITE BEARING
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