Method for producing low temperature cured ceramic friction plate

Abstract

The invention discloses a method for producing friction plates of low temperature solidified ceramics, which is characterized in that the friction plates are produced by the following raw materials based on the weight percentage: 15-25% of high temperature resistance adhesives, 20-35% of reinforcing agents, 5-15% of friction adding agents, 10-25% of anti-friction and 20-30% of filling agents. The method has the advantages of no metal or little metal, low density, no pollution, low cost and long service life, etc. As ceramic fibers and ceramic powders are adopted, the high temperature resistance, dispersivity, adsorptivity, wearing resistance and stability are good and the density and price are low, thus ensuring balanced friction coefficient, little fading, no damage to coupling, low brake noise and light weight. The overall performance can reach the level of the same international products.

Description

technical field [0001] The invention relates to a production method of an automobile brake pad, in particular to a production method of a low-temperature solidified ceramic friction pad. Background technique [0002] Automobile brake pads are important parts to control the driving and safety of automobiles, and their high temperature resistance and wear resistance directly affect their performance. The brake pads currently used are mostly composed of adhesives, reinforcing agents, friction increasing agents, friction reducing agents, and fillers, which are weighed in proportion, stirred evenly, and hot-pressed. The adhesive used is mainly a composite material made of phenolic resin and rubber; the reinforcing agent used mainly includes carbon fiber, glass fiber, steel fiber, ceramic fiber, and some artificial organic fiber and natural organic fiber. For example, aramid fiber, sisal hemp, cellulose fiber, wood fiber, etc., asbestos fiber is rarely used because of its carcino...

AI Technical Summary

Problems solved by technology

At present, the problem of the automobile brake pads made of the above materials is: the fatal weakness of the adhesive made of phenolic resin and rubber is that it is not resistant to high temperature. Moderately decompose at ℃ to generate aromatic oily liquid, and decompose into CO and CO at 400℃ 2 Gas, during continuous braking and high-speed emergency braking, the surface temperature of the friction pair rises sharply, sometimes reaching 800-1000°C, while the adhesive begins to soften, gasify, and carbonize above 300°C, causing performance thermal decline, friction The coefficient drops sharply, and the braking force decreases. In severe cases, it will cause brake failure and cause an accident

At present, there have been some studies on high-temperature-resistant adhesives, such as high-temperature-resistant modified resins, whose decomposition temperature is about 400°C-500°C; cashew nut oil-modified phenolic resin and nitrile rubber powder can change the inorganic The interface condition of fiber particles can improve the wear resistance and mechanical properties; the single performance of the reinforcing agent used can not meet the requirements. For example, the disadvantage of steel fiber is that it will rust in hot and humid environment, and it is easy to damage the pair, making it Noise is generated, so steel fibers should be added as little as possible; although carbon fibers have the advantages of low density, high strength, good thermal stability and wear resistance, they are expensive and have high production costs, so it is not appropriate to add more or not; organic Fiber and hybrid fiber have poor high temperature resistance, so it is not possible to add more or not. A single reinforcing agent has incomplete friction performance and various defects. Using multiple reinforcing agents can complement each other and play a hybrid effect. This problem has become a problem. The focus of current research; the addition of the friction-increasing agent, anti-friction agent and filler also has a greater impact on the performance of the brake pad, and its coordination performance is also obvious. If the ratio of solution is unreasonable, the performance of the brake pad Braking performance will also have large fluctuations

In order to solve these problems, relevant scientific and technological departments and personnel from all over the world have also proposed many improvement schemes, which can be roughly divided into two categories: one is to improve the heat resistance by modifying the resin, this method Although it has achieved certain results, it can increase the decomposition temperature of the resin, but it still cannot completely solve the problem of thermal decay; the other is to use high-temperature sintered ceramic materials that can withstand high temperatures, carbon-silicon-based powder metallurgy materials, etc. to replace resin-based composite materials , which can solve the problem of thermal decay, but these new materials have not been widely used due to their complex process, high cost, and unsatisfactory performance; there are also many studies on various materials for automobile brake pads, but they have become a kind of The stereotype ratio has yet to be studied

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