| 摘要 |
The disclosed material comprises different zones of a maximium size comprised between 60 and 500 microns, wherein at least two substances have different hardness and friction coefficients, the harder the substance having the higher friction coefficient. Preferably, they are comprised of grians of hard material with a high friction coefficient, said grains being bound to each other by a binder material which fills the major part of the intergranular voids, the remainder of said voids being the porosities. Conveniently, if the lubricant contains an additive of the borate or sulfide type, the hard material is a passivatable steel containing one or varoius of the following elements; Cr, Mo, V, W, Si and the less hard material is a lightly allied steel. |
