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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
关键词
ZrB2基陶瓷
短纤维
断裂韧性
弯曲强度
ZrB2 based ceramic
short fiber
fracture toughness
flexure strength
