2. Carbon graphite materials graphite is made from carbon elements of a kind of nonmetal materials. It is carbon element in one of three isomers, the six FangJing department, each level by the hexagonal ring structure, parallel planes and level, in order of overlap crystal structure.
According to the source into graphite natural graphite and artificial graphite two kinds. Artificial graphite is made from carbon quality material by more than 2500 ℃ high temperature graphitization processing and into.
Carbon graphite general electric conductivity, good heat resistance, abrasion resistance, self-lubricity, have high temperature stability, good chemical corrosion ability, thermal conductivity than high polymer, linear expansion coefficient little. In the air and at ambient temperature and chromium plated surface friction factor and wear rate is very low. But in very low humidity will convey the loss. Coating wear-resisting coating can improve carbon graphite wear resistance.
Graphite not only can make solid lubricant, can join the resin, metal, ceramic and so on materials, increase the material of reducing friction sex, still can directly as oxidizer use, such as making paper, wood processing, textile, food and other avoid oil places of the bearing, the high temperature sliding bearing, sealing ring, rings, blade, etc.
Mechanical engineering with carbon graphite materials "class" representative symbol for M, four series: carbon graphite materials, electrical-controlled graphite materials, resin carbon composite materials and metals graphite materials.
3. Ceramic materials
Ceramic is natural or man-made inorganic non-metallic minerals compounds for raw material, through crushing, forming and high temperature sintering and become, the inorganic non-metallic by countless small crystal and glass phase composition of nonmetal materials. With inorganic non-metallic natural mineral, such as clay, feldspar, quartz as raw material is made of traditional ceramics; With man-made compounds for raw materials is made of special ceramics. Mechanical engineering used in alumina ceramic general, magnesium oxide, zro2, lamps, oxide, and silicon carbide, carbonization boron, si3n4, boron nitride compounds for raw materials and artificial made of special ceramics.
The performance of the ceramic decided in the very great degree in their microscopic structure, including the grain size and distribution, glass phase composition and content, the nature of the impurities, content and distribution. And microstructure and raw materials, components and the manufacturing process that decision. The common characteristic is ceramic hardness and high compressive strength, high temperature resistant, wear-resisting, oxidation and corrosion resistance, very brittle, not impact resistance and no ductility.
Ceramic is a relatively new no lubrication bearing bearing material, especially SiC and Si3N4, their strength, heat resistance and corrosion resistance are all very good, tribological properties are also very good.




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