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Double hot-rolling composite friction material and its production

A composite friction material and double hot pressing technology, applied in the field of composite friction materials, can solve the problems of low bonding strength and low porosity, and achieve the effects of increasing porosity, increasing roughness and reducing friction noise.

Inactive Publication Date: 2007-11-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The above method uses one-time hot pressing to produce composite friction materials, and the friction brake pads produced have low bonding strength, less porosity, smooth friction surface, and are prone to friction brake noise.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Taking the Jetta front wheel brake pad as an example, the height after pressing is 12 mm.

[0033] The basic formula of the first hot-pressed hybrid fiber composite friction material (by mass percentage): 15% cashew oil modified phenolic resin; 5% clear rubber; 15% steel fiber; 5% vermiculite; 2% Kevlar fiber; 5% cotton, 8% silicon oxide; 10% talc; 5% molybdenum disulfide; 20% barium sulfate; 10% calcium hydroxide.

[0034] Mix the above materials evenly, weigh them and pour them into a standard mold (length 300mm×width 60mm), at 150°C; pressure 16Mpa; holding time 3 minutes and deflate twice; Composite friction material; put the pressed material into a constant temperature box for post-treatment at 160°C for 4 hours.

[0035] Under dry conditions, leave it for more than 24 hours; then crush it, and use a sieve of 5-10 mesh (2-2.8mm sieve hole) to sieve.

[0036] In terms of mass fraction, the formula used for the second hot-pressed composite friction ma...

Embodiment 2

[0038] Embodiment 2: Taking the Jetta front wheel brake pad as an example, the height after pressing is 12mm.

[0039]The basic formula of the first hot-pressed semi-metallic fiber composite friction material (by mass percentage): cashew nut oil modified phenolic resin 20%; nitrile rubber 5%; steel fiber 28%; copper scrap 2%; aluminum oxide 8% 2% cast stone powder; 3% molybdenum disulfide; 7% graphite; 15% barium sulfate; 5% magnesium oxide, 5% kaolin. In fact, the first thermocompression forming composite friction material can be selected from waste materials prepared from the above formula.

[0040] Mix the above materials evenly, weigh them and pour them into a standard mold (length 300mm×width 60mm), at 165°C; pressure 20Mpa; holding time 3 minutes and deflate 2 times; Composite friction material; put the pressed material into a constant temperature box at a temperature of 160Co for 4 hours of post-treatment.

[0041] Under dry conditions, let it stand for more than 24 h...

Embodiment 3

[0045] The basic formula of the first heat-pressed non-metal fiber composite friction material (by mass percentage): cashew nut oil modified phenolic resin 25%; nitrile rubber 5%; vermiculite 8%; sepiolite 10%; Kevlar fiber 2 %; aluminum oxide 10%; molybdenum disulfide 5%; talcum powder 10%; barium sulfate 15%; magnesium oxide 5%, kaolin 5%. Mix the above materials evenly, weigh them and pour them into a standard mold (length 300mm×width 60mm), use 140Co; pressure 12Mpa; hold time for 3 minutes and deflate twice; press out a composite mold with length 300mm×width 60mm×thickness 6mm Friction material; put the pressed material into a constant temperature box at a temperature of 160Co for 4 hours of post-treatment. The metal fiber-free composite friction material for the first hot pressing can also be the waste material of the first hot pressing forming composite friction material.

[0046] Under dry conditions, it is placed for more than 24 hours; then it is pulverized and scre...

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Abstract

A bi-hot pressing composite friction material and its production are disclosed. The process is carried out by the first hot-press forming, crushing for composite friction material, sifting, mixing composite friction material 40-70 wt% and high-temperature-resisting modified resin 15-35 wt% with reinforced fiber 5-15 wt%, rubber powder 5-15 wt% and residual lubrication material, putting them into mould, hot-press forming at 140-165 degree and 12-20 Mpa and keeping temperature to obtain final product. It has stable friction coefficient, less wear rate and friction noise, better surface toughness and higher gas-pocket coefficient.

Description

technical field [0001] The invention relates to a composite friction material, in particular to a double hot-press type composite friction material and a preparation method thereof. Background technique [0002] Composite friction materials are composed of materials with different physical and chemical properties and a high-molecular polymer matrix with low strength and good toughness. Because polymer materials usually cannot withstand high stress and high temperature, in order to improve the yield strength of polymer materials, thermosetting resins with network structure are used, generally various modified phenolic resins. At the same time, in order to achieve the ideal braking effect and comprehensive mechanical properties, it is necessary to add various fibers, lubricating materials, abrasives and fillers, and the polymer matrix material is almost only used as a medium for transmitting or dispersing loads. Therefore, the strength of the composite friction material mainl...

Claims

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Application Information

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IPC IPC(8): C08J5/14C08L101/00C08K7/06
Inventor 陈东谢小鹏
Owner SOUTH CHINA UNIV OF TECH
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