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The microstructure of a silicon carbide±carbon solidsolution powder (SiC±C), obtained from a ®ne powder of silicon and thermal expansive graphite, is investigated by X-ray powder diffraction methods. The microstructure is characterized by Williamson±Hall analysis and the strain-®eld model suggested by van Berkum et al.

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The paper studies the structurization of aluminum oxide ceramics sintered with additions of a synthesized fine SiC-Fe 2 O 3 powder alloy. The fine-grained powder alloy particles promote the densification of the alumina matrix. The mechanical properties of the composites are examined. The material obtained is tested as a cutting tool.Keywords: solid solution of carbon in silicon carbide, aluminum oxide, iron oxide, sintered iron ore concentrate, stishovite, cutting tool.