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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:3021  下载量:602
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.
 
3 评论数 1

用户suocheng0105:该文利用了碳纤维作为碳源,制备了复合陶瓷,其中碳化硼的加入不仅起到了颗粒增强作用,而且促进了液硅的渗入

2017-05-02 22:46:42
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