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Ni对C-B_4C-SiC复合材料显微结构与性能的影响

黄启忠 , 杨巧勤 , 杜海清 , 黄伯云 , 吕海波

金属学报

本文研究了烧结助剂Ｎｉ对Ｃ－Ｂ_４Ｃ－ＳｉＣ复合材料显微结构与性能的影响．Ｘ射线衍射表明Ｎｉ在烧结温度下与ＳｉＣ，Ｂ_４Ｃ人发生反应在晶界生成Ｎｉ_（４．６）Ｓｉ_２Ｂ，并产生液相，有效地促进了Ｃ－Ｂ_４Ｃ－ＳｉＣ复合材料的烧结，抑制了晶粒的长大，使复合材料密度与强度大幅度地增加，电阻率下降；同时Ｎｉ_（４．６）Ｓｉ_２Ｂ在氧化时生成致密的２ＮｉＯ·Ｂ_２Ｏ_３，包裹了易氧化的Ｂ_４Ｃ和Ｃ，有效地防止了复合材料的氧化，从而大大提高了制品的抗氧化性能．

关键词: 烧结助剂Ｎｉ , C-B_4C-SiC composite , microstructure , property

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

金属学报(英文版)

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.

关键词: :Si additive , null , null

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