Copper-free ceramic friction material with little falling ash and preparation method thereof

A friction material and ceramic technology, applied in the direction of friction linings, brake parts, mechanical equipment, etc., can solve the problems of not finding alternative materials, rusting, damage to the pair, etc., to achieve superior performance, simple process, low braking noise Effect

Inactive Publication Date: 2010-09-08
HUNAN BOYUN AUTOMOBILE BRAKE MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Friction materials that do not contain heavy metals such as copper or antimony will be necessary in the future to achieve the same performance requirements as existing friction materials, but for copper-based friction materials, no substitut

Method used

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  • Copper-free ceramic friction material with little falling ash and preparation method thereof
  • Copper-free ceramic friction material with little falling ash and preparation method thereof
  • Copper-free ceramic friction material with little falling ash and preparation method thereof

Examples

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preparation example Construction

[0044] The method for preparing copper-free and less-falling-dust ceramic automobile friction material provided by the present invention comprises the following steps:

[0045] (1) Batching: weigh each component material according to the above proportioning ratio;

[0046] (2) Mixing: Put the weighed materials into a high-speed mixer, and the mixing time is 2 to 3 minutes to obtain a powdery mixture;

[0047] (3) Molding: Weigh the mixture according to the brake pad model, pour it into the hot pressing mold, the pressing pressure is 180-300kgf / cm2, the hot-pressing temperature is 160-190°C, exhaust 3-8 times, and the holding time depends on the brake pad Depending on the thickness, generally 55 ~ 65s / mm;

[0048] (4) Heat treatment: heat the brake pad from room temperature to 160°C in 2 hours, keep it warm for 4 hours, then heat it up to 200°C in 1 hour, keep it warm for 4 hours, and then cool it to room temperature with the furnace;

[0049] (5) Carry out flat grinding, cha...

example 1

[0051] Example 1: Taking the front wheel brake pad of Honda Accord as an example

[0052]The raw materials and formulations used are shown in Table 1, and the Honda Accord front wheel brake pads were pressed and tested with example friction materials 1-7 and comparative friction materials 8-9, among which, steel fiber and foamed iron powder were used in 1-7, and 8 Copper fibers are used in -9. The process is as follows: the raw materials are evenly mixed, weighed and poured into the mold for molding, the temperature is 155°C; the pressure is 13MPa; the holding time is 8 minutes, and the gas is released 4 times; the temperature is raised to 160°C in the heat treatment box, and the heat preservation is 4 hours. Then raise the temperature to 200°C within 1 hour, keep the temperature for 4 hours, and then cool to room temperature with the furnace.

[0053] Table 1 Friction material formula list

[0054]

[0055] A - phenolic resin; B - nitrile rubber; C - magnesium oxide; D -...

Embodiment 2

[0066] Embodiment 2: Taking the front wheel brake pad of Buick LaCrosse as an example

[0067] In terms of mass percentage, the formula for copper-free and less dust falling is as follows: 8% nitrile modified phenolic resin, 6% nitrile rubber powder, 4% aramid fiber, 10% steel fiber, 5% carbon fiber, and 10% foam iron powder , 3% alumina fiber, 24% magnesium oxide, 8% artificial graphite, 3% mica, 4% molybdenum disulfide, 5% barite, 3% aluminum powder, 2% ferrous disulfide, 2% composite filler, Organic friction powder 2%. Mix the above-mentioned raw materials evenly, weigh them and pour them into a mold for compression molding at a temperature of 165; Heat up to 220 within 1 hour, keep the temperature for 4 hours, and then cool to room temperature with the furnace. After machining, surface treatment, painting, and packaging, the copper-free and less dust-falling friction disc is produced.

[0068] After testing, the effective friction coefficient is between 0.38-0.44, the t...

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Abstract

The invention discloses a copper-free ceramic friction material with little falling ash and a preparation method thereof. The copper-free ceramic friction material with little falling ash is prepared by mixing, shaping and thermally processing the following raw materials in percentage by weight: 5 to 14 percent of adhesive, 20 to 45 percent of reinforcing material, 10 to 40 percent of ceramic material, 10 to 18 percent of lubricant and the balance of filler, wherein nitrile rubber modified phenolic resin and nitrile rubber powder are used as the adhesive; the reinforcing material is one or a mixture of more of aramid fiber, carbon fiber, steel fiber, foam iron powder and aluminum oxide fiber; the ceramic material is one or a combination of more of molybdenum disulfide, magnesium oxide andferrous disulphide; the lubricant is the mixture of graphite and mica; and the filler is the mixture of composite filler, barite, friction powder and aluminum powder. The material has high friction performance, low brake noise and high heat fading resistance, and particularly shows high performance in aspects of wear resistance, long life and great reduction in the falling ash of a wheel hub; therefore, the material can meet both the requirement of a modern automobile braking system on operating conditions and the requirement on economy and environment friendliness when an automobile is used.

Description

technical field [0001] The invention relates to a friction material, in particular to a copper-free and low-dust ceramic friction material used in braking systems of vehicles or engineering machinery, which has excellent friction performance and mechanical strength at high temperatures. Background technique [0002] Non-asbestos-based friction materials have become the mainstream, and a variety of alternative fibers are widely used. For example, in order to improve the strength, ensure the friction coefficient and improve the quality, a large number of metal fibers, such as steel fibers and copper fibers, are used. Today's non-asbestos-based friction materials generally contain 0-20% copper fibers or copper powder. Copper is used to increase the strength, improve the coefficient of friction, and further maintain the coefficient of friction at 400°C to improve the coefficient of thermal conductivity. Unlike steel fibers, copper is less likely to damage the counterpart, i.e. ...

Claims

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Application Information

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IPC IPC(8): C04B26/10F16D65/02F16D69/02C04B14/38C04B16/06
Inventor 刘美玲刘伯威刘咏蒋辉珍
Owner HUNAN BOYUN AUTOMOBILE BRAKE MATERIALS
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