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Wet type copper base friction material and its preparation method

A friction material, copper-based technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of difficulty in adapting to high power, miniaturization of high-speed friction transmission and braking devices, low mechanical strength, and unsatisfactory thermophysical properties, etc. problems, to achieve good processability, high mechanical strength, and stable wet friction coefficient

Inactive Publication Date: 2008-04-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, wet friction materials for heavy-duty clutches and brakes are mostly prepared by powder metallurgy, which has low mechanical strength and unsatisfactory thermophysical properties, and it is difficult to meet the requirements of high-power, high-speed friction transmission and miniaturization of braking devices.

Method used

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  • Wet type copper base friction material and its preparation method
  • Wet type copper base friction material and its preparation method
  • Wet type copper base friction material and its preparation method

Examples

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preparation example Construction

[0035] In the present invention, the preparation process of the three-dimensional connected network-like dense silicon carbide ceramic skeleton can adopt the Chinese invention patent (invention name: a high-strength and dense foamed silicon carbide ceramic material and its preparation method, application number: 03134039.3, application date: 030922 ), the basic steps are as follows: (see the description of the patent application for details)

[0036] Using silicon carbide powder and high-yield carbon-rate resin as the basic raw materials and foam plastic as the template, the preparation process is as follows:

[0037] 1) Slurry preparation

[0038] Mix silicon carbide powder, high carbon yield resin, curing agent and ethanol in proportion, and the weight percentage between silicon carbide powder, high carbon yield resin and curing agent is 80wt.%~30wt.%: 19wt.%~50wt.% : 1wt.%~20wt.%, after mechanical stirring, ball milling time 0.5~2h, filter through 35~140 mesh sieves, obtai...

Embodiment 1

[0061] 1. The ribs are loose and porous three-dimensional connected network silicon carbide ceramic skeleton (the density of ribs is 80%)

[0062] The preparation of a three-dimensional connected network silicon carbide ceramic skeleton with loose and porous ribs is completed through the steps of slurry preparation→dipping→pyrolysis→filling the central hole of the carbon skeleton→siliconization;

[0063] 2. Add filler to the mesh of silicon carbide ceramic skeleton

[0064] Mix graphite with a particle size of 10 μm and iron with a particle size of 74 μm (the weight ratio of iron to graphite is 5 / 4), then add an appropriate amount of phenolic resin diluted with absolute ethanol, curing agent (p-toluenesulfonic acid), and mix again 1. After granulation, pass through 80-120 mesh (180-125 μm) sieves, and the under-sieves are dried and solidified at 100° C.; The acid addition accounts for 6wt.%-8wt.% of the resin weight, and the phenolic resin is diluted with absolute ethanol to ...

Embodiment 2

[0080] The difference from Example 1 is:

[0081] 1. Choose a dense three-dimensional connected network silicon carbide ceramic framework with ribs (the density of ribs is 99%)

[0082] The preparation of a three-dimensional interconnected network silicon carbide ceramic skeleton with dense ribs is completed through the steps of slurry preparation → dipping → hot pressing densification → pyrolysis → filling the central hole of the carbon skeleton → siliconizing;

[0083] 2. Add filler to the mesh of silicon carbide ceramic skeleton

[0084] Mix graphite with a particle size of 30 μm and iron with a particle size of 100 μm (the weight ratio of iron to graphite is 5 / 3) and a small amount of nickel powder with a particle size of 80 μm, and then add an appropriate amount of phenolic resin and curing agent diluted with absolute ethanol (for toluenesulfonic acid), mixed again, granulated and passed through an 80-mesh (180 μm) sieve, and the under-sieve was dried and solidified at 1...

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Abstract

The invention discloses a wet copper base friction material and preparing method, which is composed of three-dimensional, interconnect network carborundum ceramic skeleton, copper alloy and other inorganic fillers, wherein the bulk percentage of copper alloy is 60-70 vol. percent; the bulk percentage of network carborundum ceramic skeleton and inorganic filler is 40-30 vol. percent. The fusing high-temperature liquid alloy is squeezed in the three-dimensional network carborundum ceramic skeleton of inorganic filler under pressure, which possesses high dynamic strength. The invention can be applied in large power; high speed wet friction driving and braking device.

Description

technical field [0001] The invention relates to the improvement technology of copper-based friction materials, in particular to a wet-type copper-based friction material and a preparation method thereof. Background technique [0002] Friction materials must have sufficient mechanical strength and modulus, high heat resistance and thermal conductivity, high heat capacity, stable friction coefficient and low wear rate. [0003] So far, wet friction materials for heavy-duty clutches and brakes are mostly prepared by powder metallurgy, which has low mechanical strength and unsatisfactory thermophysical properties, and is difficult to meet the requirements of high-power, high-speed friction transmission and miniaturization of braking devices. For this reason, there is an urgent need to develop a new friction material and its preparation method to meet the needs of the development of high-power, high-speed clutches and brakes. Contents of the invention [0004] The purpose of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/14
Inventor 曹小明邢宏伟胡宛平田冲张劲松
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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