Self-lubrication

Whereas the traditional dimethyl siloxane fluids provide very poor lubrication for steel on steel and other common metals, thin films on glass reduce handling damage, small amounts in plastic composites bleed to the surface for self-lubrication, and they provide a superior lubricant for mbber surfaces. 

About 88% of Hon powder production is used in the manufacture of P/M parts and friction materials. Detailed statistical data are available (16). About 86% of the copper and copper-base powder produced is used in the production of self-lubricating bearings and P/M parts. 

Lubricants. TeUurides of titanium, 2irconium, molybdenum, tungsten, and other refractory metals are heat- and vacuum-stable. This property makes them useful in soUd self-lubricating composites in the electronics, instmmentation, and aerospace fields (see Lubrication and lubricants). Organic teUurides are antioxidants in lubricating oUs and greases. 

Carbon-graphite 700 Good bearing and self-lubricating properties. Good resistance to chemicals, beat. 

Bearings The bearings will preferably have an arrangement for self-lubrication. 

Lubrication of compressor cylinders can be tailored to the application. The cylinders may be designed for normal hydrocarbon lubricants or can be modified for synthetic lubricants. The cylinder may also be designed for self lubrication, generally referred to as nonlubed. A compromise lubrication method that uses the nonlubed design but requires a small amount of lubricant is referred to as the mini-lube system. 

Self-lubricating grades are of particular value in some gear and bearing applications. One commercial nylon compound incorporates 0.20% molybdenum disulphide and 1 % of graphite whilst many other commercial compounds contain only one of these two lubricants. 

Development of Self-Lubricating. Piston-Seal Materials for High-Pressure, Oil-Free Air Compressors , Rept No PAS-75-21, Naval Ship R D Center, Annapolis (1975) 3) T. Toshiaki ... 

Molybdenum disulhde (M0S2), graphite, hexagonal boron nitride, and boric acid are examples of lamella materials commonly applied as solid lubricants. The self-lubricating nature of the materials results from the lamella crystalline structure that can shear easily to provide low friction. Some of these materials used to be added to oils and greases in powder forms to enhance their lubricity. Attention has been shifted in recent years to the production and use of nanosize particles of M0S2, WS2, and graphite to be dispersed in liquid lubricants, which yields substantial decreases in friction and wear. 

Engineering resins are polymers that have outstanding physical properties such as thermal stability, chemical resistance, self-lubrication, weather resistance, etc. Generally, they are thermoplastics. They are gaining in importance in automobile manufacture as metal replacements to provide lighter weight cars. 

Examples of internal lubricants are fatty acid derivatives, e.g., stearates (for PVC), waxes and polyethylene oligomers containing polar groups obtained by partial oxidation. Not all polymers require lubricants LDPE, nylon and PET are self-lubricating. 

Teflon has self-lubricating properties which are utilized in making nonstick frying pans and lightweight bearings. 

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