What are powder metallurgy friction materials?

Powder metallurgy friction materials are made by powder metallurgy methods with high friction coefficient and high wear resistance of metal and non-metal materials, also known as sintered friction materials. This material is usually composed of three parts: base metal (copper, iron or its alloys), lubrication components (lead, graphite, molybdenum disulfide, etc.), friction components (silica, asbestos, etc.). Its structure is characterized by the uniform distribution of various particles with special properties in a continuous metal matrix.

The metal matrix exerts good thermal conductivity and withstands mechanical stress, and the evenly distributed particles ensure the required friction properties. Compared with traditional asbestos resin or metal friction materials, its advantages are high friction coefficient, small change of friction coefficient with changes in temperature, pressure and speed, high temperature resistance, good seizure resistance, low wear, long life, etc. Powder metallurgy friction materials can be divided into two categories: copper-based and iron-based according to the composition of the matrix.

The iron-based ones have slightly higher hardness, strength, friction coefficient, allowable specific pressure and higher surface instantaneous temperature than the copper-based ones, while the copper-based ones have better thermal conductivity, corrosion resistance and less wear than the iron-based ones. In order to increase the strength of powder metallurgy friction materials, they are usually bonded to a steel backing and become a bimetallic structure. Copper-based friction materials are mostly used in clutches, especially in wet clutches.

Iron-based friction materials are mostly used in brakes. These two materials have been widely used in clutches or brakes for aircraft, tanks, automobiles, ships, tractors, construction machinery and machine tools, etc.

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Powder metallurgy products are mostly made of metal. Powder metallurgy is a process technology that produces metal or uses metal powder as raw material, through forming and sintering, to manufacture metal materials, composite materials and various types of products. The powder metallurgy products industry in a broad sense includes iron and stone tools, cemented carbide, magnetic materials and powder metallurgy products.

The powder metallurgy products industry in the narrow sense only refers to powder metallurgy products, including powder metallurgy parts, oil-impregnated bearings and metal injection molding products.

Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability, which is very suitable for mass production.

Powder metallurgy has a unique chemical composition and mechanical and physical properties, which cannot be obtained with traditional melting and casting methods. The use of powder metallurgy technology can be directly made into porous, semi-dense or fully dense materials and products, such as oil-impregnated bearings, gears, cams, guide rods, tools, etc., which is a less cutting-free process.

Powder metallurgy related enterprises are mainly suitable for the production and research of spare parts in the fields of automobile industry, equipment manufacturing industry, metal industry, aerospace, military industry, instrumentation, hardware tools, electronic household appliances, etc., production of related raw materials and auxiliary materials, and manufacturing of various powder preparation equipment and sintering equipment. Products include bearings, gears, carbide tools, molds, friction products and more.

Powder metallurgy has similarities with the production of ceramics, both belong to powder sintering technology, therefore, a series of new powder metallurgy technologies can also be used for the preparation of ceramic materials.

1. Powder metallurgy is the process technology of preparing retarded metal powder or using metal powder as raw material, forming and sintering, manufacturing metal materials, composite materials and various types of products;

2. The powder metallurgy method is similar to the production of ceramics, both of which belong to powder sintering technology, therefore, a series of new powder metallurgy technologies can also be used for the preparation of ceramic materials;

3. Due to the advantages of powder metallurgy technology, it has become the key to solving the problem of new materials and plays a pivotal role in the development of new materials.

1. Powder metallurgy is the process technology of preparing metal collapse powder or using metal powder as raw material, forming and sintering, manufacturing metal materials, composite materials and various types of products;

2. Powder metallurgy is similar to the production of ceramics, both of which belong to powder sintering technology, therefore, a series of new powder metallurgy technologies can also be used for the preparation of ceramic materials;

3. Due to the advantages of metallurgical technology, it has become the key to solving the problem of new materials and plays a pivotal role in the development of new materials.