Low-fading-rate NAO friction material and preparation method thereof

A friction material and decay rate technology, which is applied in the field of low decay rate NAO friction materials and its preparation, can solve the problems of poor high temperature resistance of organic fibers, inability to effectively and quickly dissipate heat, and poor thermal conductivity. Solve the effect of thermal recession and moderate hardness

Active Publication Date: 2013-04-24
珠海华莱汽车零部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the friction material made of NAO, due to the reduction of its metal content, the thermal conductivity becomes poor, the heat cannot be effectively and quickly dissipated, and ...

Method used

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  • Low-fading-rate NAO friction material and preparation method thereof
  • Low-fading-rate NAO friction material and preparation method thereof

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preparation example Construction

[0017] The preparation method involved in the present invention comprises the following steps:

[0018] (1) Mixing: Weigh all the raw materials according to the weight of the formula, put all the raw materials into a high-speed mixer, and stir for 2 to 5 minutes to make a friction material mixture;

[0019] (2) Pre-compression molding: put the mixed material into the pre-forming mold, using 400-500kg / cm 2 Press forming into a cold billet, and then put the cold billet into the mold for pressing;

[0020] (3) Hot pressing: Put the mixture into the mold, the mold temperature is controlled at 150±5°C, the pressing pressure is 30±2MPa, and the heat preservation and pressure holding time is 30s / mm. One time of air, the residence time of each exhaust is 5s, after that, the mold is opened and exhausted 3 to 5 times every 10s;

[0021] (4) Heat treatment: From room temperature to 140°C, heat at a constant rate for 1 to 2 hours, keep warm for 2 to 4 hours, from 140°C to 160°C, heat at...

Embodiment 1

[0026] Example 1: 5 parts of resin, 4 parts of friction powder, 2 parts of nitrile rubber powder, 3 parts of tire powder, 1 part of aramid fiber, 14 parts of silicate mineral fiber, 7 parts of brass fiber, 27 parts of barite , 3 parts of zirconium silicate, 1 part of brown corundum, 6 parts of fluoride, 5 parts of red vermiculite, 1 part of sulfur, 1 part of calcium oxide, 10 parts of artificial graphite, 5 parts of natural flake graphite and 5 parts of calcined petroleum coke, according to The material prepared by the above preparation method by mixing, pressing and heat treatment was tested for friction and wear, and the test results are shown in Table 2.

Embodiment 2

[0027] Example 2: 3 parts of resin, 6 parts of friction powder, 1 part of nitrile rubber powder, 5 parts of tire powder, 1 part of aramid fiber, 13 parts of silicate mineral fiber, 6 parts of brass fiber, 28 parts of barite , 2 parts of zirconium silicate, 2 parts of brown corundum, 5 parts of fluoride, 4 parts of red vermiculite, 1 part of sulfur, 2 parts of calcium oxide, 9 parts of artificial graphite, 4 parts of natural flake graphite and 6 parts of calcined petroleum coke, according to The material prepared by the above preparation method by mixing, pressing and heat treatment was tested for friction and wear, and the test results are shown in Table 2.

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Abstract

The invention discloses a low-fading-rate NAO friction material and a preparation method thereof. The low-fading-rate NAO friction material has the characteristics of low cost, stable friction factor, low fading rate at high temperature, favorable restorability, low wear rate, high inner shear strength, small specific gravity and moderate hardness. The low-fading-rate NAO friction material disclosed by the invention is prepared from the following raw materials in parts by weight: 3-8 parts of resin, 2-6 parts of friction powder, 1-3 parts of butadiene-acrylonitrile rubber powder, 2-5 parts of tire powder, 20-22 parts of fiber and 63-68 parts of filler. The preparation method comprises the following steps: (1) mixing: weighing all raw materials according to the formula, putting into a high-speed mixer, and stirring for 2 minutes; (2) pre-pressure forming: putting the mixture into a cold-press mold, and carrying out pressure forming to obtain a cold blank; (3) hot pressing: putting the cold blank into a mold, and pressing; and (4) heat treatment: carrying out heat treatment in an oven, heating to 200 DEG C from room temperature, and baking for 4-16 hours.

Description

technical field [0001] A low decay rate NAO friction material and a preparation method thereof. Background technique [0002] With the development of high-speed and heavy-duty vehicles, trains, and airplanes, people's requirements for safety, comfort, and cleanliness continue to increase, and their awareness of physical health and environmental protection has increased. The dynamic performance requirements are more stringent, and the selection of materials is more stringent. Due to the excellent performance and low cost of asbestos, early friction materials mainly used asbestos as a reinforcing material, but more and more data prove that asbestos is extremely harmful to humans and is recognized as a carcinogen. Asbestos dust during use causes serious pollution to the environment. The mandatory national standard GB12676-1999 also stipulates that brake friction linings in my country should not contain asbestos since October 1, 2003. With the development of friction material...

Claims

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Application Information

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IPC IPC(8): C09K3/14C08L101/00C08L9/02C08K13/04C08K7/10C08K7/06B29C43/00B29B7/00
Inventor 杨鸿太李康曾文天朱海振
Owner 珠海华莱汽车零部件有限公司
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