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Short carbon fiber modified high friction composite and preparing method and application thereof

A short carbon fiber and composite material technology, applied in friction linings, mechanical equipment, etc., can solve problems such as poor toughness, low room temperature and high temperature strength, toughening and forming difficulties, etc., to achieve high conductivity, low friction coefficient, The effect of stabilizing the coefficient of friction

Active Publication Date: 2018-05-11
HUNAN SHIXIN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low room temperature and high temperature strength and poor toughness of the existing copper-based powder metallurgy brake pads, the present invention provides a short carbon fiber modified high-friction composite material and a preparation method thereof, that is, nano oxide particles and short carbon fibers are used The synergistically reinforced copper-based composite material uses the in-situ generation of nano-oxide particles in the copper matrix to greatly increase the room temperature and high-temperature strength of the copper matrix, and uses a large number of uniformly distributed nano-scale oxide particles to increase the hardness, thereby further improving the strength of the overall material. Abrasion resistance; further through resin coating-carbonized short carbon fibers, combined with high-energy ball milling, and a specific heat treatment process, the copper matrix with dispersed nano-oxide particles is toughened, which solves the problem of short carbon fibers dispersed in the matrix. Due to the problems of toughening and forming difficulties caused by both, a copper-based composite material with high strength, high toughness, high temperature resistance and good wear resistance has been obtained.

Method used

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  • Short carbon fiber modified high friction composite and preparing method and application thereof
  • Short carbon fiber modified high friction composite and preparing method and application thereof
  • Short carbon fiber modified high friction composite and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] The short carbon fiber modified high-friction composite material prepared in Example 1 comprises the following components in terms of mass percentage:

[0096] 2.0% short carbon fiber, 10% iron, 5% chromium, 3% silicon carbide, 3% zirconia, 2% granular graphite, 10% flake graphite, 8% iron-chromium alloy, 30% nano-alumina dispersion strengthened copper powder , Electrolytic copper powder 27%. The particle size of iron, chromium, silicon carbide, zirconia, and iron-chromium alloy is 100 microns, the particle size of granular graphite and flake graphite is 120 microns, the particle size of nano-alumina dispersed copper powder is 120 microns, and the electrolytic copper powder The particle size is 200 microns. The short carbon fibers have a diameter of 8 μm and a length of 2 mm. The difference from Comparative Example 2 and Comparative Example 3 is that the copper powder part is made of nano-alumina dispersion-strengthened copper powder, and the short carbon fibers are r...

Embodiment 2

[0102] The short carbon fiber modified high-friction composite material prepared in Example 2 comprises the following components in terms of mass percentage:

[0103] Short carbon fiber 2.0%, iron 10%, chromium 3%, silicon carbide 2%, granular graphite 2%, flake graphite 10%, iron-chromium alloy 9%, nanometer yttrium oxide dispersed copper powder 62%. The particle size of iron, chromium, silicon carbide and iron-chromium alloy is 100 microns, the particle size of granular graphite and flake graphite is 120 microns, and the particle size of nano-yttrium oxide dispersed copper powder is 100 microns. The short carbon fibers have a diameter of 8 μm and a length of 2 mm.

[0104] First, resin-coated-carbonized short carbon fibers are prepared. Dissolve the prepared phenolic resin in an organic solvent to obtain a phenolic resin alcohol saturated solution; then impregnate the short carbon fibers in an 80°C phenolic resin alcohol saturated solution for 2 hours; then dry at 120°C for...

Embodiment 3

[0109] The short carbon fiber modified high-friction composite material prepared in Example 3 comprises the following components in terms of mass percentage:

[0110] Short carbon fiber 1.5%, iron 10%, chromium 4%, silicon carbide 2%, zirconia 3.5%, granular graphite 2%, flake graphite 12%, iron-chromium alloy 6%, nano-alumina dispersed copper powder 25%, Electrolytic copper powder 34%. The particle size of iron, chromium, silicon carbide, zirconia, and iron-chromium alloy is 90 microns, the particle size of granular graphite and flake graphite is 120 microns, the particle size of nano-yttrium oxide dispersed copper powder is 100 microns, and the electrolytic copper powder The particle size is 150 microns. The short carbon fibers have a diameter of 8 μm and a length of 2 mm.

[0111] First, resin-coated-carbonized short carbon fibers are prepared. Dissolve the prepared phenolic resin in an organic solvent to obtain a phenolic resin alcohol saturated solution; then impregnat...

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Abstract

The invention relates to a short carbon fiber modified high friction composite and a preparing method and application thereof, and belongs to the technical field of friction materials. Raw materials used by the short carbon fiber modified high friction composite comprise 1wt.% to 3wt.% of resin coating-carbonization treatment short carbon fibers and larger than or equal to 15wt.% of nanometer oxide dispersion strengthened copper powder. In the nanometer oxide dispersion strengthened copper powder, nanometer oxide is generated in an in-situ manner. The preparing method comprises the steps thatthrough combination of internal oxidation and reduction, the nanometer oxide dispersion strengthened copper powder is prepared, meanwhile, the resin coating-carbonization treatment short carbon fibersand the nanometer oxide dispersion strengthened copper powder are processed through the proper ball milling annealing process to obtain composite pre-alloying copper powder; the powder is mixed withother components to be subject to pressing and sintering, and a finished product is obtained. The designed and prepared copper-base composite is excellent in mechanical property, high temperature resistance and wear resistance, and the preparing process is simple.

Description

technical field [0001] The invention relates to a copper-based composite material, in particular to a short carbon fiber modified high-friction composite material and its preparation method and application. Background technique [0002] The brake pads in the braking system of high-speed trains are one of the key components for the safe operation of high-speed trains. During the braking process of high-speed trains, the highest instantaneous temperature generated by the brake pads during braking can reach 600-1000°C. The friction and wear performance requirements of braking materials are very strict, and traditional cast iron and synthetic materials cannot meet the braking requirements of high-speed trains. [0003] The existing friction materials for high-speed train braking are mainly copper-based powder metallurgy materials. In order to ensure the strength of the material, various types of components are usually added, such as Cr, FeCr, Fe and other metals, as well as SiC...

Claims

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Application Information

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IPC IPC(8): C22C49/02C22C49/14C22C47/04C22C47/14F16D69/02C22C101/10C22C121/02
CPCC22C47/04C22C47/14C22C49/02C22C49/14F16D69/023
Inventor 肖鹏方华婵
Owner HUNAN SHIXIN NEW MATERIALS CO LTD
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