Effect of Si addition on hot-pressed ZrB2–SiC composite with polycarbosilane as a precursor
Effect of Si addition on hot-pressed ZrB2–SiC composite with polycarbosilane as a precursor
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DOI：
10.1016/j.matlet.2008.04.034
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发表时间：
2008-08
影响因子：
3
通讯作者：
Weiming Guo;Xiao-Jun Zhou;Guo‐Jun Zhang;Y. Kan;Yaogang Li;Pei-ling Wang
中科院分区：
文献类型：
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作者：
Weiming Guo;Xiao-Jun Zhou;Guo‐Jun Zhang;Y. Kan;Yaogang Li;Pei-ling Wang
我们之前报道过，在氩气气氛下，在 20 MPa 的压力下，在 2073 K 下热压 60 分钟，由聚碳硅烷涂覆的 ZrB2 粉末热解混合物制备 ZrB2-SiC 复合材料。本文将Si添加剂引入到相同加工条件下制备的ZrB2-SiC复合材料中，试图将聚碳硅烷热解引入的碳杂质转化为SiC。对复合材料的相组成、微观结构和力学性能进行了表征。分析表明Si添加剂可以与碳反应生成SiC。与我们之前发表的结果相比，Si粉的添加增强了复合材料的显微硬度，并且对断裂韧性没有显着影响。
We have previously reported the preparation of ZrB2–SiC composite from the pyrolyzed mixtures of polycarbosilane-coated ZrB2powders via hot pressing at 2073 K for 60 min under a pressure of 20 MPa in an argon atmosphere. In the present paper, Si additive was introduced into the ZrB2–SiC composite fabricated with the same processing conditions, in an attempt to convert carbon impurities introduced by the pyrolysis of polycarbosilane into SiC. The phase composition, microstructure and mechanical properties were characterized for the composite. Analysis showed that the Si additive could react with carbon to produce the SiC. In comparison with our previously published results, the addition of Si powder enhanced the micro-hardness of the composite, and did not have significant effect on fracture toughness.