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任全兴,冯东,茹红强,赵世伟,刘宝友,王伟,张翠萍.催化剂对B4C-SiC-Si复合材料组织与性能的影响[J].稀有金属材料与工程(英文),2020,49(2):650~654.[Ren Quanxing,Feng Dong,Ru Hongqiang,Zhao shiwei,Liu baoyou,Wang Wei and Zhang Cuiping.Effect of Catalysts on Microstructure and Properties of B4C-SiC-Si Composites[J].Rare Metal Materials and Engineering,2020,49(2):650~654.]
Effect of Catalysts on Microstructure and Properties of B4C-SiC-Si Composites
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Received:April 02, 2019  Revised:April 28, 2019
DOI:
Key words: Catalyst  Gel-casting  B4C-SiC-Si composites  microstructure  mechanical properties
Foundation item:国家自然科学基金(51772048);国家重点研发计划(2017YFB0310300);装备预先研究项目(4142210905,41422010903)
Author NameAffiliation
Ren Quanxing,Feng Dong,Ru Hongqiang,Zhao shiwei,Liu baoyou,Wang Wei and Zhang Cuiping  
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Abstract:
      The B4C/C preforms were prepared by the gel-casting and the B4C-SiC-Si composites were fabricated based on liquid silicon infiltration process. The effects of different catalysts (Na2CO3, NaOH, KOH, Na2SiO3 and NaHCO3)on the microstructure and mechanical properties of B4C-SiC-Si composites were investigated. The results showed that the catalyst mainly affected the microstructural uniformity of composites and the size of residual Si. The composites were mainly composed of B4C, B12(B,C,Si)3, SiC and Si. When NaOH, KOH or NaHCO3as catalyst, the distribution of residual Si was uniform. With the NaOH as catalyst, the mechanical properties of B4C-SiC-Si composites were the best:the hardness, flexural strength and fracture toughness were 16.9 GPa, 296 MPa and 4.15 MPa.m1/2, respectively.