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三维碳化硅/碳化硅陶瓷基编织体复合材料

徐永东; 成来飞; 张立同   

  1. 西北工业大学凝固技术国家重点实验室, 西安 710072
  • 收稿日期:2000-04-10 修回日期:2000-05-08 出版日期:2001-03-20 网络出版日期:2001-03-20

Three Dimensional Textile SiC/SiC Composites by Chemical Vapor Infiltration

XU Yong-Dong; CHENG Lai-Fei; ZHANG Li-Tong

  

  1. State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xian 710072; China
  • Received:2000-04-10 Revised:2000-05-08 Published:2001-03-20 Online:2001-03-20

摘要: 采用化学气相浸渗法(CVI),制备出三维Hi-NicalonSiC/SiC陶瓷基编织体复合材料.经30h CVI致密化处理后,复合材料的密度达到 259·cm-3,所研制的三维 SiC/SiC复合材料不仅具有较高的强度,而且表现出优异的韧性和类似金属材料非灾难性的断裂特征.复合材料的主要力学性能指标为:弯曲强度 860MPa,断裂位移 1.2mm,断裂韧性41.5MPa·m1/2,断裂功28.1kJ·m-2,冲击韧性36.0kJ·m-2

关键词: 化学气相浸渗法, 三维SiC/SiC复合材料, 力学性能, 显微结构

Abstract: Three dimensional textile SiC/SiC composites were fabricated by chemical vapor infiltration, and
their mechanical properties and microstructure were investigated. The density of the composites was 2.5g·cm-3 after the
preform was infiltrated for 30 hours. The present composite materials exhibited excellent mechanical properties and metal-like failure behavior.
The flexural strength and displacement were 860MPa and 1.2mm, respectively. Fracture toughness and work of fracture were 41.5MPa·m1/2 and
28.1kJ·m-2, respectively. The dynamic toughness was determined by using Charpy impact method and its value was 36.0kJ·m-2.

Key words: chemical vapor infiltration, 3D SiC/SiC composites, mechanical properties, microstructure

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