In recent years, using plastics in sliding materials, for example, in oilless bearings, sliding parts, gears, clutches, and brakes, increases all the time. In particular, in the case of business machines, such as photocopying machines and printers, size and cost reductions are required, which determine the achievement of definite friction-and-wear characteristics. Specifically, in the case of bearings, a low coefficient of friction and a low wear rate are necessary. To achieve the required properties, the development of sliding plastic materials has been started on a wide scale by materials makers and plastic bearing makers. In the case of clutches and brakes, high coefficients of friction and heat resistance are necessary to make them more compact [1]. The meeting of respective requirements to respective machines makes it necessary to raise their tribological properties to an adequate level. In recent years, tribological properties of these machines started to be characterized not only by the coefficient of friction and the friction rate, but also by μ-v characteristics. This indicated the relationship between the coefficient of friction μ and the speed of sliding v. The requirements of such tribological properties as the elimination of friction vibration and noise generation appeared.
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