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液硅渗透法制备SiBC改性C/CSiC复合材料

Keywords: 复合材料,C/C-SiC,B12(C,Si,B)3,浆料浸渗,液硅渗透

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Abstract:

为了降低液硅渗透法制备C/C-SiC复合材料中残留Si的含量,采用浆料浸渗结合液硅渗透工艺制备B12(C,Si,B)3改性C/C-SiC复合材料。通过分析不同比例B4C-Si体系在不同温度的反应产物,确定了B12(C,Si,B)3的生成条件。结果表明:B4C和Si在1300℃开始反应,生成少量B12(C,Si,B)3和SiC,且B12(C,Si,B)3的生成量随反应温度的升高而增加;当B4C和Si的摩尔比为3:1、反应温度为1500℃时,产物为B12(C,Si,B)3和SiC;液硅渗透法制备的C/C-SiC复合材料相组成为非晶态C、β-SiC和B12(C,Si,B)3,未见残留Si。

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