碳短纤维-ZrB_2陶瓷基复合材料的制备与性能研究  

Fabrication and Properties of Short Carbon Fiber-ZrB_2 Ceramic Matrix Composites

作　　者：杨飞宇[1] 杜善义[1] 孟松鹤[1] 

机构地区：[1]哈尔滨工业大学复合材料与结构研究所,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2007年第A01期700-703,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50602010);新世纪优秀人才计划基金(NCET-05-0345)

摘　　要：对ZrB2-SiC(ZS)材料和碳短纤维/ZrB2-SiC(ZSC)材料的断裂韧性、室温至900℃弯曲强度进行了测试和研究。结果表明:短纤维的加入可以显著提高材料的断裂韧性、从4.25MPa·m1/2提高到6.56MPa·m1/2,纤维拔出和脱粘以及裂纹的桥接和偏转是材料断裂韧性提高的原因;ZS和ZSC材料弯曲强度从室温到900℃经历了不同的过程,但都是两种因素共同作用的结果,即温度升高,晶界软化所带来的对裂纹的愈合作用与温度升高所带来的界面结合强度下降的作用。The fracture toughness and flexure strength from room temperature to 900℃ of zirconium diboride-silicon carbide （ZS） composites and zirconium diboride-silicon carbide with the addition of short carbon fiber （ZSC） were examined and analyzed. Results show that short fiber can greatly improve the fracture toughness of ZS from 4.25 MPa.m^1/2 to 6.56 MPa-m^1/2, which is attributed to fiber pull-out, debonding, and crack bridging and deflection. The flexure strength of ZS and ZSC experience different courses from room temperature to 900℃, which is the result of the competition between healing effect of grain-boundary softening and decreasing interface strength with increasing of the temperature.

关 键 词：ZrB2基陶瓷 短纤维 断裂韧性 弯曲强度 

分 类 号：TQ174.758.2[化学工程—陶瓷工业]