Reinforced organic ceramic friction material and preparation method thereof

Abstract

The invention relates to a reinforced organic ceramic friction material which is prepared from 25.6-27% of polysulfonamide, 5.6-9% of potassium titanate whiskers, 9-12.6% of aramid fiber, 5-7% of copper fiber, 3.4-4% of ceramic fiber, 4-4.6% of zirconite, 3.4-4% of vermiculite, 15-16.4% of graphite, 2.2-3% of carbon black, 2.2-3% of antimony trisulfide, 2.2-3% of magnesium oxide, 1.2-2% of mica, 3.6-4% of nitrile rubber powder and 8-10% of nitrile rubber modified phenolic resin. During preparation, a preparation method comprises the steps: firstly grinding polysulfonamide, the potassium titanate whiskers, the aramid fiber, the copper fiber and the ceramic fiber to form powder; then, grinding zirconite, vermiculite, graphite, carbon black, antimony trisulfide, magnesium oxide and mica to form particles; and finally, mixing the nitrile rubber powder and the nitrile rubber modified phenolic resin with the powder and the particles, and carrying out hot pressing on the mixture to obtain the reinforced organic ceramic friction material. The reinforced organic ceramic friction material is stable in friction performance, low in wear rate, long in service life and free of noise.

Description

technical field [0001] The invention relates to the technical field of automobile braking, in particular to an organic ceramic friction material and a preparation method thereof. Background technique [0002] Automobile friction material is the key material in automobile brakes, clutches and friction transmission devices. It converts the kinetic energy of automobile movement into heat energy and other forms of energy, so that the automobile slows down or stops. Its main function is friction. It is a multi-component composite material that requires structural performance. Therefore, its performance is directly related to the reliability and stability of the system operation. With the development of the automobile industry in various developed countries and the improvement of environmental protection awareness in modern society, the operation of friction materials The conditions are becoming more and more stringent, and its performance requirements are getting higher and highe...

AI Technical Summary

Problems solved by technology

[0003] (1) Semi-metallic friction material: the friction coefficient declines less, and the wear resistance is good, but its disadvantages are: ①Steel fiber is easy to rust, and it is easy to stick or damage the pair after corrosion, and the strength of the product after corrosion decreases and wears Increase; ②The thermal conductivity is high, and it is easy to cause air resistance in the braking system at high temperature, causing the friction layer to separate from the steel plate: ③The hardness is high, which will damage the dual material, resulting in chatter and low-frequency braking noise: ④High density

[0004] (2) Glass fiber friction material: low cost, easy to form, simple process, good friction and mechanical properties, but glass fiber is brittle, easy to break during mixing and loses a large reinforcement; smooth surface, small specific surface area, It is not easy to adsorb resin and filler, which will cause the glass fiber to separate from the resin matrix and filler and make the components mixed unevenly; the high hardness will cause the friction coefficient of the friction material to be unstable, the wear will be large, and the pair material will be worn. Irritant to human skin

[0007] The existing environment-friendly brake friction materials are all friction materials made of other materials instead of asbestos, such as a low-wear environment-friendly composite ceramic-based friction material described in Chinese patent 200910104550.7, which uses aramid fiber, ceramic fiber and no modification High-quality nitrile rubber replaces asbestos, but the price is too high, it is difficult to mix with other fillers, it is easy to agglomerate, and the factors that affect the environment are not fully considered

[0008] Due to the problems of noise, vibration, high wear rate and short service life of semi-metallic friction materials and asbestos-free organic friction material brake pads mainly used in automobile braking systems, the alternative carbon / carbon composite friction materials have excellent performance. However, its cost is high, and it is usually only used on aircraft, while ceramic materials have the advantages of small specific gravity, high melting point, high hardness, good chemical stability and corrosion resistance, and have been widely used in friction materials. A hot area of ​​materials research