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Ceramic/metallic double continuous phase composite material brake pad and preparation method thereof

A dual continuous phase and composite material technology, applied in friction linings, mechanical equipment, etc., can solve problems such as short life, high cost, and low performance of brake pads, and achieve considerable economic and social benefits

Active Publication Date: 2011-06-22
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

[0006] The purpose of the present invention is to provide a ceramic / metal bicontinuous phase composite brake pad for high-speed train braking and its preparation method, which solves the problems of low performance, short life and high cost of brake pads in the prior art

Method used

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  • Ceramic/metallic double continuous phase composite material brake pad and preparation method thereof
  • Ceramic/metallic double continuous phase composite material brake pad and preparation method thereof
  • Ceramic/metallic double continuous phase composite material brake pad and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] (2) Preparation and filling of friction components

[0044] Fe powder (35~300 mesh, 30~10%wt); SiO 2 Powder (35-200 mesh, 45-10%wt); Cr powder (35-300 mesh, 10-20%wt); Ni powder (100-300 mesh, 5-20%wt); Mo powder (100-300 mesh, 5-15%wt); natural graphite powder (35-300 mesh, 0-25%wt) etc. are weighed in proportion and mixed, and 5-15%wt of binder (water glass, silica sol, etc.) is added ; Mix evenly and then dry; use mechanical means to pulverize and granulate through a 30-200 mesh sieve to obtain friction component particles; use mechanical vibration or suction to fill the friction component particles into the mesh of foam ceramics.

[0045] (3) Connection between silicon carbide foam ceramics and steel back

[0046] The silicon carbide foam ceramics filled with friction components in the mesh and the steel back are connected together by clamping or screw fixing.

[0047] (4) Preheating of silicon carbide foam ceramic skeleton steel back and melting of copper alloy ...

Embodiment 1

[0058] First prepare silicon carbide foam ceramics according to the method provided by the patent application number 03134039.3, wherein the size of the silicon carbide foam ceramic mesh is 0.8mm.

[0059] The composition of the friction components is shown in Table 1, and they were mixed evenly and then dried; mechanically pulverized and granulated through a 100-mesh sieve to obtain friction component particles. The oscillating method is used to fill the friction component particles into the meshes of the foam ceramics.

[0060] Table 1 Composition of surface wipe component mixed particles

[0061] make up

No

ceramic foam

Mesh size

(mm)

ceramic foam

Volume fraction

(%)

silica

Micropowder g

(120~180 mesh)

Atomized iron powder g

(120~180 mesh)

Chromium powder g

300 mesh

Nickel powder g

300 mesh

Molybdenum powder g

300 mesh

Partial silicon

Sodium acid

ml

l...

Embodiment 2

[0065] The difference from Example 1 is:

[0066] Firstly, silicon carbide foam ceramics were prepared respectively according to the method provided by the patent application number 03134039.3, wherein the mesh size of the silicon carbide foam ceramics was 0.4mm.

[0067] The composition of the friction components is shown in Table 2. Mix them uniformly and then dry them; grind them mechanically, pass through a 120-mesh sieve and granulate to obtain the friction component particles. The oscillating method is used to fill the friction component particles into the meshes of the foam ceramics.

[0068] Table 2 Composition of friction components mixed particles

[0069] make up

No

ceramic foam

Mesh size

(mm)

ceramic foam

Volume fraction

(%)

silica

Micropowder g

(120~180 mesh)

Atomized iron powder g

(120~180 mesh)

Chromium powder g

300 mesh

Nickel powder g

300 mesh

Molybdenum powder ...

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Abstract

The invention relates to the field of friction materials for braking of high-speed trains, in particular to a ceramic / metallic double continuous phase composite material brake pad and a preparation method thereof. The brake pad comprises the following components in percentage by weight: 15 to 40 percent of foam silicon carbide ceramics, 10 to 30 percent of friction element and 75 to 30 percent ofmetal. The method comprises the following steps of: preparing the silicon carbide foam ceramics having a three-dimensional network structure by employing a technology combining polymer pyrolysis withcontrollable infiltration reaction sintering; selecting a proper friction element and filling in mesh holes of the foam ceramics; and injecting melt copper alloy into a framework of the foam ceramicsby utilizing an extrusion casting method to obtain the ceramic / metallic double continuous phase composite material brake pad. The composite material brake pad can be paired with a 28CrMoV forged steel brake disc, has the characteristics of proper and stable friction coefficient, low wear rate, high heat resistance, high thermal or mechanical damage resistance, good process performance, low manufacturing cost, long service life and the like, completely meets the brake requirement of a high-speed train at a speed of 200 to 300km / h, and has good competitive advantage on the brake requirement of a high-speed train at the speed of 350km / h.

Description

technical field [0001] The invention relates to the field of friction materials for braking high-speed trains, in particular to a three-phase composite ceramic / metal double continuous-phase composite material brake sheet of silicon carbide foam ceramics, friction components and copper alloy and a preparation method thereof. Background technique [0002] High-speed trains with a speed of 200km / h or more generally use disc brakes. When other braking methods of high-speed trains fail, disc brakes are the only guarantee for the train to stop safely. Therefore, the disc brake is a key component of high-speed trains and an important guarantee for safe operation, and the research on its key material——advanced brake materials has naturally become an important task in the research of brake devices. It is also for this reason that France, Germany and Japan all regard disc brake friction materials as key technologies to tackle key problems when developing high-speed railways. At prese...

Claims

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Application Information

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IPC IPC(8): F16D69/02
Inventor 张劲松曹小明张宇南田冲杨振明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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