RECYCLING OF LIGHT WEIGHT B_4C BASED COMPOSITES

摘要

Recycling of light weight B_4C based composites by thermal processing use is the object of present work. At firs, for recycling the next compounds, formed during heat treatment at temperatures over 1150°C in oxidize surrounding, have influence on the aging time and as result, on spontaneous disintegration of composite. At second, for recycling after heat treatment at temperature under 1500°C this high wear resistant but brittle material don't have metallic binder phase and the chemical structure consists only from refractory ceramic compounds. From these starting materials after spontaneous disintegration, disintegration and attrition milling or/and mixing with new added binder metal content (Al, Cu, C) were received the new light weight composites. For manufacturing the SHS process with subsequent high pressure and heat treatment was used. The testing results show, that this light weight composite has lowest friction coefficient and highest dray sliding wear resistant in system of steel-composite with comparison of light weight on base of coarse grained boron carbide composite.