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低残硅含量反应烧结碳化硼/碳化硅复合陶瓷制备与性能研究

发表时间：2016-09-30 浏览量：3501 下载量：749

全部作者：	宋索成，鲍崇高，王可可
作者单位：	西安交通大学材料科学与工程学院
摘要：	为提高复合陶瓷机械性能，将短碳纤维引入B4C/SiC复合陶瓷中。由于碳纤维自搭建的互相贯穿结构有利于渗硅更加充分，当碳纤维体积分数不高于30%时，碳纤维反应完全，残硅量降至4.5%（体积分数），强度为473 MPa；当碳纤维体积分数为40%，残余碳纤维部分硅化，丧失一定性能，起到部分增韧作用，其断裂韧性达到5.8 MPa•m1/2；组织中出现两种核壳结构：原碳化硅（α-SiC）-次生碳化硅（β-SiC）， B4C-硼（B）、碳（C）、硅（Si）三元相；B4C主要以颗粒增强、促进渗硅、降低残硅含量等方式提高复合陶瓷机械性能。
关键词：	无机非金属材料；反应烧结；碳纤维；低残硅量；核壳结构；机械性能
Title：	The Fabrication and Properties Reinforcement of Reaction Bonded Boron Carbide/Silicon Carbide Composite Ceramic With Low Residual Silicon
Author：	SONG Suocheng, BAO Chonggao, WANG Keke
Organization：	Material Science and Engineering School, Xi’an Jiaotong University
Abstract：	In order to improve the mechanical properties of the composite ceramic, short carbon fiber was introduced into the composite ceramic. The porous self-supporting interpenetrating network structure proved beneficial for the silicon infiltration process. When the volume fraction of carbon fiber is less than 30%, carbon fiber has a complete reaction. The volume of residual silicon of the composite decreased to 4.5% (volume fraction) and flexural strength is 473 MPa. When the volume fraction of carbon fiber is 40%, carbon fiber has a partial reaction and performance reduction. The fracture toughness is 5.8 MPa•m1/2; There are two kinds of core-rim structures: α-SiC and β-SiC, B4C and B, C, Si ternary phase; By reinforcing particle, promoting silicon infiltration and reducing residual silicon content, B4C improves the mechanical properties of the composite.
Key words：	inorganic non-metallic materials; reaction bonded;carbon fiber; low residual silicon content; core-rim structure; mechanical properties
发表期数：	2016年9月第18期
引用格式：	宋索成，鲍崇高，王可可. 低残硅含量反应烧结碳化硼/碳化硅复合陶瓷制备与性能研究[J]. 中国科技论文在线精品论文，2016，9（18）：1879-1885.