椴木经高温炭化转变为木炭,经熔融硅反应性渗入后,生成具有椴木微观结构的多孔SiC陶瓷.借助TGA(采用Rigaku Thermal型热分析仪)研究了椴木的热分解行为,用XRD和SEM研究了椴木木炭和多孔SiC陶瓷的物相组成和微观结构,还探讨了Si向木炭中渗入-反应动力学和多孔SiC的基本性能.结果显示,木炭为无定形的非晶碳材料,多孔SiC由主晶相β-SiC和少量未反应C组成的;多孔SiC具有椴木的管胞结构,与木炭相比,力学性能得到显著改善;碳纤维向SiC纤维的转化及其对裂纹萌生、扩展的抑制作用和偏转作用是提高力学性能的主要机制.
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