Boron Containing Solid and Superhard Composites Production Techniques and Properties

摘要

In this paper, the Boron containing solid and superhard composites preparation techniques and their properties are reviewed. A series of superhard composites were prepared by combining high energy ball milling, self-propagating high-temperature synthesis, chemical leaching, spark plasma sintering and heat treatment techniques. As-prepared composites microstructure and phase composition were characterized by means of optical microscopy, high resolution scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction techniques. Their mechanical properties such as microano hardness, indentation modulus, and volume wear dry sliding were evaluated as well. During SHS the large amount of relative soft and adverse phases were formed in bulk solid composites. These phases were removed from composite by chemical leaching. At final, the superhard composites with Vickers microhardness over 40 GPa were produced by spark plasma sintering and heat treatment in nitrogen environment.