No lubrication bearing shell material ( A)

No lubrication bearing materials mainly include polymer, carbon graphite and three types of special ceramics. ( 1) Polymer polymer is also called plastic, used as a mechanical engineering material of plastic known as engineering plastics. It was based on the synthetic resin as the main component, also contains a variety of plasticizer, stabilizer, antioxidant, antistatic agent, flame retardant agent, curing agent, strengthen material and filling material of organic high polymer material. Many different kinds of polymer, divided into two major categories of thermoplastic and thermosetting according to its characteristics. Thermoplastic polymers commonly used are: polyamide, polyacetal, polyethylene, polytetrafluoroethylene, polypropylene, polyurethane, etc. They are linear or branched structures of organic macromolecular compounds, can soften repeated heating and cooling to harden. Thermoplastic injection molding, extrusion, blow molding, calendering process methods, such as molding. Thermosetting polymers commonly used mainly phenolic resin, epoxy resin, etc. They add catalyst in machining process or curing agent curing, once curing is complete, it will be never melting solid materials. Thermosetting polymer molding, laminated molding, casting, etc. Commonly used plastic bearings, guide rail, piston ring, such as friction pair parts, such as water pump bearings, rolling mill bearing, the stern bearing, etc. , especially can make no lubrication bearing with plastic. Ptfe will sheet stamping into lip seal, bearing, piston rings and gaskets, etc. , and successfully applied to the belt conveyor, typewriter, sewing machines, record player turntable, pumps, textile machinery and agricultural machinery equipment. Polymer is qualitative light, insulation, antifriction, wear resistance, self-lubrication, corrosion resistance, molding process is simple, high production efficiency, etc. Compared to metal materials, their tribological performance is sensitive to environment temperature and humidity, related to the viscoelastic characteristics significantly, at the end of mechanical strength, modulus of elasticity is small, poor to adsorption of lubricating oil.