Manufacturing method of wear-resistant alloy coating of automobile brake disc

Abstract

The invention discloses a manufacturing method of a wear-resistant alloy coating of an automobile brake disc. The manufacturing method of the wear-resistant alloy coating of the automobile brake disccomprises the following raw materials: 25%-70% of tungsten carbide, 15%-70% of chromium carbide and a brake disc base material, and hypersonic flame is utilized. Through axially feeding powder to theflame, spraying particles can be heated to a molten or semi-molten state and accelerated to be up to 300-500 m/s, so that the compact high-quality coating with high bonding strength is obtained. The hypersonic flame speed is very high, but the temperature is relatively low and is about 3000 DEG C. For WC-Co series hard alloys, decomposition of WC in the spraying process can be effectively inhibited, and the coating is high in bonding strength and compact. The wear resistance is excellent, greatly exceeds that of a plasma spraying layer, is equivalent to that of an explosion spraying layer, andalso exceeds that of an electroplated hard chromium layer and a spray melting layer. The surface hardness is increased and can reach HV900-1200. The temperature resistance can reach 600-900 DEG C, the emission of brake dust is reduced by 90%, and the effect of no rusting can be achieved forever.

Description

technical field [0001] The invention belongs to the technical field of brake discs, in particular to a method for manufacturing a wear-resistant alloy coating of an automobile brake disc. Background technique [0002] The brake disc is the brake disc, which is a metal disc made of alloy steel and fixed on the wheel to rotate with the wheel. When the vehicle is running, when the brakes are applied, the brake calipers clamp the brake disc to slow down or stop the vehicle. Generally, there are round holes on the brake disc, and its function is to reduce weight and increase friction. There are many kinds of brake discs, which are characterized by thin walls, and the discs and the center are formed by sand cores. Different types of brake discs have differences in disc diameter, disc thickness and the size of the gap between the two discs, and the thickness and height of the disc hubs are also different. [0003] Although the gray cast iron material is very suitable for the man...

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Problems solved by technology

[0003] Although the gray cast iron material is very suitable for the manufacture of brake discs, the gray cast iron material has a low hardness of about 200HV, limited wear resistance, and the coefficient of friction only remains stable up to about 400°C

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