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纤维表面涂层对SiC(f)/SiC复相陶瓷力学性能和界面结构的影响

施鹰1; 荒木弘2; 杨文2; 野田哲二2   

  1. 1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海 200050; 2. 日本科学技术厅金属材料技术研究所; 日本305-0047
  • 收稿日期:2000-10-13 修回日期:2001-01-10 出版日期:2001-09-20 网络出版日期:2001-09-20

Influence of Fiber Pre-coating on Mechanical Properties and Interfacial Structures of SiC(f)/SiC Composites

SHI Ying1; ARAKI Hiroshi2; YANG Wen2; NODA Tetsuji 2   

  1. 1.State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China; 2. National Research Institute for Metals; Science and Technology Agency 305-0047. Japan
  • Received:2000-10-13 Revised:2001-01-10 Published:2001-09-20 Online:2001-09-20

摘要: 报道了化学气相浸渍(CVI)工艺制备的SiC(f)/SiC复相陶瓷中纤维表面涂层对复合材料力学性能和显微结构的影响.SEM观察表明:C或 BN表面涂层改变了SiC(f)/SiC复相陶瓷中纤维与基体间的强界面结合,使断裂过程中的界面解离和纤维拔出大大增加,与此同时材料的断裂韧性和断裂功明显提高.说明C或BN纤维表面涂层能够大大地改善SiC(f)/SiC复相陶瓷的脆性断裂行为模式.高分辨电镜的观察证实在CVI过程初期,纤维表面首先发生石墨界面相的沉积.该界面相具有明显的层状晶格条纹,而纤维表面C涂层为无定型态.

关键词: SiC(f)/SiC, 复相陶瓷, 力学性能, 界面结构

Abstract: High performance SiC(f)/SiC composites were fabricated by chemical vapor infiltration (CVI) processing. The effects of pre-coating of SiC fiber on the mechanical properties
and microstructures of SiC(f)/SiC composites were investigated. It was found that the introduction of C or BN pre-coating on SiC fiber surface could promote the pull-out
of fiber and interfacial debonding in the course of fracture markedly, coupled by great increases of fracture toughness and work of fracture. SEM micrographs indicated
that strong interfacial bonding between fiber and matrix was changed, suggesting that the brittle fracture mode of SiC(f)/SiC composite without any pre-coating was
improved. HREM observation showed that in the initial period of CVI processing, graphite interphase with obvious layered configuration with better crystallization degree was first deposited
on the surface of fiber, whereas the C pre-coating on SiC fiber was amorphous.

Key words: SiC(f)/SiC, composites, mechanical properties, interfacial structure

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