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——    Modern powder metallurgy technology, technology, materials, forming the performance
11-21

① powder metallurgy friction-reducing material. Also known as sintering friction-reducing materials. By immersing oil in the pores of the material or by adding friction reducing agents or solid lubricants to the material components. The surface friction coefficient is small, in the limited lubricating oil conditions, long life, high reliability; in dry friction conditions, relying on their own or the surface contains the lubricant, which has a self-lubricating effect. Widely used in the manufacture of bearings, bearing bushings or seal for the end.

② powder metallurgy porous materials. Also known as porous sintered material. By the spherical or irregular shape of the metal or alloy powder by molding, sintering made. Materials within the channel criss-cross, through each other, generally 30% to 60% of the volume of porosity, pore diameter of 1 to 100 microns. Through the performance and thermal conductivity, good conductivity, high temperature, low temperature, thermal shock resistance, dielectric corrosion. Used in the manufacture of filters, porous electrodes, fire extinguishing devices, antifreeze devices.

③ powder metallurgy structural materials. Also known as sintered structural materials. Can withstand tension, compression, distortion and other loads, and can work under the conditions of friction and wear. Due to the existence of residual porosity inside the material, its ductility and impact value than the same chemical composition of the casting and forging low, so that its scope of application is limited.

④ powder metallurgy friction materials. Also known as sintered friction material. (Such as lead, graphite, molybdenum disulfide), friction component (silicon dioxide, asbestos, etc.), which is composed of the base metal (copper, iron or other alloy) and lubricating components. High friction coefficient, can quickly absorb kinetic energy, braking, transmission speed, wear small; high strength, high temperature, good thermal conductivity; good bite resistance, corrosion resistance, by oil, moisture. Mainly used in the manufacture of clutches and brakes.

⑤ powder metallurgy tooling materials. Including carbide, powder metallurgy high-speed steel. The latter organization uniform, small grain size, no segregation, casting high-speed steel toughness and wear resistance, heat treatment deformation is small, long service life. Can be used to manufacture cutting tools, molds and parts of the blank.

⑥ powder metallurgy electromagnetic materials. Including electrical materials and magnetic materials. Silver, platinum and other precious metal powder metallurgy materials and silver, copper as the base to add tungsten, nickel, iron, tungsten carbide, graphite, etc. made of powder metallurgy materials; used as a power head material for gold, silver, platinum and other precious metal powder metallurgy materials; Electrode of tungsten copper, tungsten and nickel and other powder metallurgy materials; used as a brush with metal - graphite powder metallurgy materials; for electric heating alloys and thermocouple molybdenum, tantalum, tungsten and other powder metallurgy materials.

Magnetic materials are divided into soft magnetic materials and hard magnetic materials. Soft magnetic materials are magnetic powder, magnetic core, soft ferrite, moments ferrite, pressure ferrite, microwave ferrite, ferrite and powder silicon steel; hard magnetic materials are hard ferrite, rare earth cobalt Hard magnetic, magnetic recording materials, fine powder hard magnetic, magnetic plastic. Used in the manufacture of a variety of conversion, transfer, storage of energy and information of magnetic devices.

⑦ high-temperature powder metallurgy materials. Including powder metallurgy superalloys, refractory metals and alloys, cermets, dispersion strengthening and fiber strengthening materials. For the manufacture of high-temperature use of the turbine disk, nozzles, blades and other high temperature components.