反应烧结SiC制备SiC/B_4C复合材料的研究  

Studies on the SiC/B_4C Composite Fabricated by Reaction Bonded SiC

作　　者：张翠萍[1] 茹红强[1] 岳新艳[1] 王伟[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110004

出　　处：《稀有金属材料与工程》2011年第S1期536-539,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50872018);国家教育部基本科研业务费培育种子基金(N100402004);辽宁省科技项目博士启动基金(20101041)

摘　　要：基于反应烧结SiC制备出相对密度较高的SiC/B4C复合材料,并探讨原料中C含量对SiC/B4C复合材料物相、显微结构、体积密度、力学性能的影响。结果表明,SiC/B4C复合材料的相组成为B4C、SiC、Si、B13C2和B12.97Si0.03C2。SiC/B4C复合材料的显微组织为:SiC相和B4C相均匀分布,游离Si填充在B4C相和SiC相的空隙处,且形成了连续相。随着原料中C含量的增加,复合材料的力学性能整体呈现先增加后降低的趋势。原料中C最佳添加量为10%(质量分数),对应SiC/B4C复合材料的维氏硬度、抗弯强度和断裂韧性分别为24.4GPa、361.3MPa和4.41MPa·m1/2,复合材料开口气孔率和体积密度分别为0.19%和2.58g/cm3。SiC/B4C composite was fabricated based on reaction bonded SiC method. The influence of carbon content on the phase composition, microstructure, density and mechanical properties was studied. The results show that the composite consists of B4C, SiC, Si, B13C2 and B12.97Si0.03C2 phases. The microstructure analysis show that: the SiC and B4C phases distribute in the composite uniformly, while free Si fills in the continuous gaps between B4C and SiC phases. The mechanical properties of SiC/B4C composites are improved initially and then deteriorated with the increase in C contents whose optimal amount is 10%. The optimum open porosity, bulk density, Viker-hardness, bending strength and fracture toughness of the obtained SiC/B4C ceramic composite are 0.19%, 2.58 g/cm3, 24.4 GPa, 361.3 MPa and 4.41 MPa·m1/2, respectively.

关 键 词：SiC/B4C复合材料 反应烧结SiC 真空渗Si 显微组织 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]