THE EFFECT OF SILICON ADDITIVE ON THE STRUCTURE AND PROPERTIES OF C-B

金属学报(英文版), 1996, 9(3): 206-210.

THE EFFECT OF SILICON ADDITIVE ON THE STRUCTURE AND PROPERTIES OF C-B_4C-SiC COMPOSITE

HUANG Qizhong , YANG Qzaoqin and WU Lijun(Powder Metallurgy Research institute , Central Sonth University of Technology , Changsha 410083 , China Materials Research and Test Center , Hnnan University , Changsha 410082 , ChinaLab. of Atomic Imaging of Solids , Institute of Metal Research , Chinese Academy of Sciences , Shenyang110015 , ChinaState Key Laboratory for Corrosion and Protection , Institute of Corrosion and Protection of Metals , Chinese Academy of Sciences , Shenyang 110015 , China)Manuscript received 4 August 1995 , in revised form 6 April 1996

Keywords： :Si additive , null , null

A Preliminary study of the effect of silicon additive on the structure and properites of C-B_4C-SiC composite was conducted. A liquid Phase has formed and the liquid Si reacts with C to form SiC at the grain boundary when sintering, which accelerates the sintering process and retards the grain growth. Consequently, the density and strength of the composite increase markedly. And the increase in the density increases the oxidation resistance and decreases the specific resistance of the composite. Furthermore,the C-B_4 C-SiC composite has good heat-shock resistance. The phenomena may be dueto the strengthening and toughening of microcracks.

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THE EFFECT OF SILICON ADDITIVE ON THE STRUCTURE AND PROPERTIES OF C-B_4C-SiC COMPOSITE

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