Preparation method of friction material for vehicle brake disc

Abstract

The invention discloses a preparation method of a friction material for a vehicle brake disc, which is characterized in that: the friction material comprises the following components: 23-27 parts by weight of a thermosetting resin, 6-8 parts by weight of a resin curing agent, 10-12 parts by weight of an alumina fiber, 4-6 parts by weight of a potassium titanate whisker, 2-4 parts by weight of an attapulgite, 5-7 parts by weight of a chromite powder, 6-8 parts by weight of a calcium silicate ceramic powder, 8-10 parts by weight of barium sulfate, 2-4 parts by weight of colloidal molybdenum disulfide, 3-5 parts by weight of a talc, and 8-10 parts by weight of a flake graphite; the preparation method comprises the following steps: 1) weighting the raw materials according to the above weight ratio, firstly mixing the attapulgite, the chromite powder, the calcium silicate ceramic powder, the barium sulfate, and the talc, and then adding the colloidal molybdenum disulfide into the mixture and finally adding the graphite into the mixture, so as to obtain a mixture material; 2) mixing the resin curing agent, the thermosetting resin, the alumina fiber, and the potassium titanate whisker, and then adding the mixture material obtained by the step 1) into the mixture, so as to obtain a friction material mixture; 3) pressing the friction material mixture into a green body, and compression molding the green body.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a method for preparing friction materials for automobile brake pads. Background technique [0002] With the rapid development of the automobile industry, the number of automobiles is also constantly expanding. Automobile brake pads, as a key component of the automobile braking system, need to meet the requirements of safe and reliable braking, smooth and noiseless operation. At present, there are three types of domestic vehicle friction materials: 1) Asbestos-based: Its manufacturing cost is low and the process is simple; it is mainly used for agricultural vehicles and construction machinery. Its disadvantages: asbestos is harmful to the human body, pollutes the environment, suffers from severe heat decay at high temperature, poor braking performance, and low safety factor. This kind of product has been decreasing year by year and is an obsolete product. 2) Semi-metal base: I...

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Problems solved by technology

Its disadvantages: asbestos is harmful to the human body, pollutes the environment, suffers from severe heat decay at high temperature, poor braking performance, and small safety factor. This kind of product has been decreasing year by year and is an obsolete product.

Its disadvantages: high hardness of the product, noise during braking, especially low-speed braking or morning effect, easy to generate noise, easy to rust on the surface of the product, and corrode the counterpart at the same time, high thermal conductivity, when the friction temperature is higher than 300 ℃ At the same time, it is easy to decompose the adhesive between the friction material and the steel sheet. On the other hand, the high friction heat is quickly transmitted to the hydraulic mechanism of the brake, resulting in the aging of the hydraulic "O" seal ring and the air resistance of the brake fluid, resulting in brake failure.

Disadvantages: Noise and dust problems have not been solved, easy to rust

[0003] However, domestic ceramic-based friction material brake pads are still immature, and their product performance cannot meet the needs of use.

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