SiC粒度对ZrB_2-SiC超高温陶瓷力学性能的影响  

Influence of SiC Particle Size on Mechanical Properties of ZrB_2 -SiC Ultra-high Temperature Ceramics

作　　者：彭艾伊 李俊国[1] 沈强[1] 张联盟[1] 

机构地区：[1]武汉理工大学 材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《稀有金属材料与工程》2013年第S1期426-429,共4页Rare Metal Materials and Engineering

基　　金：武汉理工大学自主创新基金(125201009)

摘　　要：在添加相同含量SiC条件下,改变原料SiC的粒度制备了4种ZrB2-SiC复合材料。讨论了ZrB2-SiC复合材料中SiC粒度、材料微观结构与残余应力、材料力学性能三者间的关系。结果表明,样品的残余应力随SiC粒度增加先减小再增大,这可能是由于SiC原料不同程度氧化生成SiO2造成的。随着SiC粒度的增大,断裂韧性的变化趋势和残余应力相反,说明在本实验的SiC粒度范围内,残余应力对材料主要起到破坏作用。The relationship among SiC particle sizes, microstructure as well as residual stresses and the mechanical properties of the ZrB2 -SiC material was discussed. Four kinds of ZrB2-SiC composites were prepared using a mixture of ZrB2 and SiC powder in the same proportion. With the increasing of the SiC particle size, the residual stress firstly decreases and then increases. This phenomenon may caused by the different oxidation degree of the SiC. The change tendency of residual stresses and the fracture toughness is opposite to each other, which means the residual stress is negative to the fracture toughness of the materials.

关 键 词：ZRB2-SIC 粒度 残余应力 力学性能 

分 类 号：TQ174.1[化学工程—陶瓷工业]