Powder metallurgy brake pads are generally divided into iron based and copper based

Powder metallurgy brake pads are generally divided into iron based and copper based

People in the powder metallurgy industry know that friction materials such as brake shoes or brake pads have obvious performance advantages and flexibility in product diversification after being produced by powder metallurgy technology. Powder metallurgy technology can change the composition of materials in a large range, and avoid the defects such as porosity, shrinkage cavity, dendritic segregation of material structure, crystal growth, etc. in traditional manufacturing processes, so as to improve the mechanical properties and friction and wear properties of parts.

The advantage of powder metallurgy brake shoe is that the friction coefficient of cast iron brake shoe is not affected by weather and climate, the friction coefficient of organic composite brake shoe does not change with train speed, and the wear resistance and thermal conductivity are good. The brake shoe has been used in high-speed trains in Sweden, Canada and other countries, high-power locomotives in France and TGV high-speed trains, and has achieved certain braking effects. However, the powder metallurgy brake shoe has serious wear on wheels, and its cost is higher than that of cast iron and organic composite brake shoe, so it is difficult to use in large quantities.

Powder metallurgy brake discs are divided into iron based and copper based brake discs. Iron based powder metallurgy brake discs have excellent friction properties and high mechanical strength under high temperature and high load. They can be used in the range of 400-1000 ℃, but wear is considerable at low speed. The thermal stability of iron base is higher than that of copper base. Its disadvantage is that it has affinity with duality (such as cast iron or steel), is easy to bond, has large friction coefficient fluctuation, and is easy to generate abnormal wear and noise.

The friction coefficient of copper based powder metallurgy sample is high at low speed, low at high speed, and the wear amount does not increase at high speed. Therefore, although the cost of copper based brake pads is relatively high, they are widely used due to their stable braking performance, small thermal shock to brake discs and good running in.