Powder metallurgy materials refer to materials made from several metal powders or metal and non-metal powders through processes such as mixing, pressing, sintering, and necessary subsequent processing. This process, called powder metallurgy, is a method different from smelting and casting. Powder metallurgy materials have unique chemical composition and physical and mechanical properties that cannot be obtained by traditional melting and casting processes, such as controllable porosity, uniform material structure, and no macrosegregation (after solidification, there is no uneven chemical composition in different parts of the cross-section due to the macroscopic flow of the liquid alloy), and they can be formed in one step.Here Harber MIM make a brief introduction to antifriction and friction materials in powder metallurgy materials.
Powder metallurgy antifriction materials, also known as sintered antifriction materials. Made by immersing lubricating oil in the pores of the material or adding antifriction agents or solid lubricants to the material composition. The friction coefficient between material surfaces is small, and under the condition of limited lubricating oil, the service life is long and the reliability is high; Under dry friction conditions, relying on the lubricant contained in itself or on the surface layer, it has a self-lubricating effect. Widely used for manufacturing bearings, bearing bushes, or as end seals.
Powder metallurgy friction materials, also known as sintered friction materials. It consists of three parts: a base metal (copper, iron, or other alloys), a lubricating component (lead, graphite, molybdenum disulfide, etc.), and a friction component (silicon dioxide, asbestos, etc.). Its high friction coefficient can quickly absorb kinetic energy, braking and transmission speed is fast, and wear is small; High strength, high temperature resistance, good thermal conductivity; Good bite resistance, corrosion resistance, and little impact from grease and moisture. Mainly used in manufacturing clutches and brakes.
A powder metallurgical porous material made from spherical or irregularly shaped metal or alloy powder by molding and sintering; Powder metallurgy structural materials that can withstand loads such as tension, compression, and torsion, and can work under friction and wear conditions; Powder metallurgy tool and mold materials that can be used to manufacture cutting tools, molds, and blanks for parts are common powder metallurgy materials. Different powder metallurgy materials have different concepts and applications.
Currently, powder sintered metal has been widely used in automobiles. According to statistics, there are about 40 to 60 sintered parts per vehicle in Japan. The powder metal used in automobile manufacturing in the United States has reached 12.7 kg/vehicle in 1995, and its application range includes mechanical parts, sliding parts, friction parts, porous materials, magnetic materials, superhard tool materials, electrical materials, etc. It can be seen that powder metallurgy materials have been widely used.
