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,2020,49(2):650~654.[Ren Quanxing,Feng Dong,Ru Hongqiang,Zhao shiwei,Liu baoyou,Wang Wei,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.]
催化剂对B4C-SiC-Si复合材料组织与性能的影响
投稿时间:2019-04-02  修订日期:2019-04-28
中文关键词:  催化剂  凝胶注模  B4C-SiC-Si复合材料  显微组织  力学性能
基金项目: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)
中文摘要:
      采用环境友好型间苯二酚甲醛水基凝胶体系,应用凝胶注模成形法制备B4C/C坯体,结合反应渗Si烧结工艺制备B4C-SiC-Si复合材料。重点考察Na2CO3、NaOH、KOH、Na2SiO3和NaHCO3五种不同碱性催化剂对B4C-SiC-Si复合材料组织与力学性能的影响。结果表明:催化剂主要影响复合材料的组织均匀性及游离Si的尺寸。添加五种不同催化剂时复合材料主要由BxC、B12(B,C,Si)3、SiC和Si组成,以NaOH、KOH或NaHCO3为催化剂时,复合材料中游离Si的分布较均匀、尺寸较小;以NaOH作为催化剂时,B4C-SiC-Si复合材料的综合力学性能最佳,其硬度、抗折强度和断裂韧性分别达到16.9 GPa、296 MPa和4.15 MPa.m1/2
Effect of Catalysts on Microstructure and Properties of B4C-SiC-Si Composites
英文关键词:Catalyst  Gel-casting  B4C-SiC-Si composites  microstructure  mechanical properties
英文摘要:
      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.
作者单位E-mail
任全兴 东北大学 材料各向异性与织构教育部重点实验室 1083082246@qq.com 
冯东 东北大学 材料各向异性与织构教育部重点实验室  
茹红强 东北大学 材料各向异性与织构教育部重点实验室 ruhq@smm.new.edu.cn 
赵世伟 东北大学 材料各向异性与织构教育部重点实验室  
刘宝友 东北大学 材料各向异性与织构教育部重点实验室  
王伟 东北大学 材料各向异性与织构教育部重点实验室  
张翠萍 东北大学 材料各向异性与织构教育部重点实验室  
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