Method for preparing brake block by calcium carbonate crystal whisker

Abstract

The invention relates to a method for preparing a brake sheet through adopting calcium carbonate crystal whisker, belonging to the friction material field, wherein the following raw materials of corresponding part by weight are adopted: 5 to 15 portions of adhesive which adopts phenol formaldehyde resin, 20 to 30 portions of reinforcing material which is obtained through mixing steel fiber or ceramic fiber with one or several of aramid fiber, mineral fiber and glass fiber, 1 to 15 portions of grinding agent which comprises one or combination of several of aluminum sesquioxide, ferric oxide, magnesium oxide and friction powder, 5 to 15 portions of lubricant which comprises one or combination of several of graphite, molybdenum disulfide and mica, 5 to 15 portions of stabilizer calcium carbonate crystal whisker, and 30 to 50 portions of filler which comprises one or combination of several of barium sulfate, potassium titanate and magnesium oxide. The brake sheet, which is made through the method, can effectively increase porosity and improve the high-temperature resistance of material, thereby lowering the decomposition rate of organic material at a high temperature; meanwhile, the brake sheet can slow down the gaseous escape speed on a friction surface during fading, thereby reducing fading rate and the change rate of friction coefficient at high speed to less than 10 percent.

Description

technical field [0001] The invention relates to a method in which calcium carbonate whiskers are used for preparing brake pads in the field of friction materials. Background technique [0002] At present, the friction materials for automobiles in my country are dominated by semi-metals, which account for more than 70% of the total output. However, semi-metal friction materials have high product density, are easy to rust and scratch, and are prone to low-frequency noise during use. The disadvantage is that it can no longer meet people's higher and higher requirements for friction material products. Its upgraded product, ceramic-based friction material, overcomes the shortcomings of semi-metallic formula, has a stable friction coefficient, good braking comfort during use, and long service life, which has become the development trend of friction materials. In addition to binders, reinforcing fibers, and fillers, the basic composition of brake pads also has a very important clas...

AI Technical Summary

Problems solved by technology

Although the thermal ablation process can improve the recession to a certain extent, it cannot solve this problem, and the ablation is easy to cause other problems, such as: the shear force is reduced, easy to peel off; the uniformity of ablation; and Product consistency, etc.