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热处理对含CSiCTaCC界面C/C复合材料力学性能的影响

, PP. 98-103

Keywords: C/C复合材料,C-SiC-TaC-C界面,热处理,界面微观结构,力学性能

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Abstract:

以准三维针刺炭纤维毡为预制体,采用化学气相渗透工艺在预制体中炭纤维/基体炭之间制备C-SiC-TaC-C复合界面,利用树脂浸渍-炭化工艺对材料进一步增密,获得含C-SiC-TaC-C界面的C/C复合材料。研究了1400~2500℃不同温度热处理前后复合材料的微观结构和力学性能。结果表明:热处理前,SiC-TaC界面为管状结构,复合材料的抗弯强度为241.6MPa,以脆性断裂为主;经1400~1800℃热处理后,TaC界面破坏呈颗粒状,复合材料的平均抗弯强度下降到238.9~226.1MPa,其断裂方式不变,但断裂位移由0.7mm增至1.0mm;经2000~2500℃热处理后,SiC、TaC界面均受到破坏,复合材料平均抗弯强度急剧下降至158.7~131.8MPa,断裂方式由脆性断裂转变为假塑性断裂。

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