Abstract
A study of the effect of temperature on the friction characteristics of transition metal carbides, borides and nitrides as well as of B 4C, SiC and AlN in the temperature range of 20–1400 °C was made in vacuum. Using X-ray and electron microscopy methods some features of the surface structure after friction were studied. During friction of refractory metal-like compounds significant changes were shown by X-ray studies to be caused both by the temperature and friction deformation. At the temperatures above 0.4 T melt the deformation factor has no significant effect on the fine structure change. Electron microscopy studies of microsections of the near-surface layers (thickness, 0.1 mm) showed that a fine-grain layer was formed on the surface. During vacuum heating the friction coefficient of the refractory metal-like compounds was shown to decrease at comparatively low temperatures whereas above 0.4 T melt it increased. In the case of B 4C, SiC and AlN the friction coefficient decreases continuously during heating.
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