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李建平,成来飞,叶昉,程赞粼,刘永胜,张铭霞.BN纤维束增强氮化物复合材料的制备与性能[J].稀有金属材料与工程(英文),2018,47(9):2901~2908.[Li Jianping,Cheng Laifei,Ye Fang,Cheng Zanlin,Liu Yongsheng and Zhang Mingxia.Preparation and Properties of BN Fiber Reinforced Nitride Mini-composites[J].Rare Metal Materials and Engineering,2018,47(9):2901~2908.]
Preparation and Properties of BN Fiber Reinforced Nitride Mini-composites
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Received:March 21, 2018  Revised:May 18, 2018
DOI:
Key words: Chemical vapor infiltration  BN fiber  Nitride ceramic matrix composites  Mechanical property  Dielectric property
Foundation item:国家自然科学基金资助(项目号51472201,51602258)
Author NameAffiliation
Li Jianping,Cheng Laifei,Ye Fang,Cheng Zanlin,Liu Yongsheng and Zhang Mingxia  
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Abstract:
      BNf/BN, BNf/SiBN and BNf/Si3N4 mini-composites were fabricated by Low pressure chemical vapor deposition/infiltration (LPCVD/CVI) process. The microstructure, tensile property and dielectric property of BN fiber bundle and these three mini-composites were investigated. Results indicated that BN fiber composed of h-BN with low crystallinity, phase structure of which unchanged after heat treatment at 650 oC and 800 oC. Amounts of micro pores with size of 50-500nm exist on the surface of BN fiber. Mean tensile strength of BN fiber bundle heat treated at 800 oC is 94 MPa. Average tensile strength of BNf/BN, BNf/SiBN and BNf/Si3N4 mini-composites were 68.8 MPa, 30.6 MPa and 26.2 MPa, respectively. Three mini-composites all exhibited brittle fracture behavior, owing to the modulus mismatch between fiber and matrix and strong interphase bond strength. Cracks cannot be effectively deflected and fibers cannot bear the load effectively. Real part of dielectric constant and dielectric loss were lower than 3 and 0.04, respectively, indicating good Electromagnetic wave transmitting property. BNf/BN possessed the best comprehensive performance.