ZrO_2纤维加入量对莫来石-10vol.%SiC晶须复合材料机械性能和抗热震稳定性的影响  

The Effect of ZrO_2 Fiber on the Flexural Toughness and Thermal Shock Resistance of the Mullite-10%vol.SiC WhiskerCeramic

作　　者：彭子钧 安迪 罗旭东[1,2] 张国栋 谢志鹏[2] 

机构地区：[1]辽宁科技大学高温材料与镁资源工程学院,辽宁鞍山114051 [2]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《陶瓷学报》2017年第5期706-710,共5页Journal of Ceramics

基　　金：国家自然科学基金(51402143);辽宁省自然科学基金项目(2015020236);清华大学新型陶瓷与精细工艺国家重点实验室开放课题(KF201516)

摘　　要：为了提高莫来石复合材料的机械性能和抗热震稳定性,将ZrO_2纤维引入到莫来石-SiC晶须复合材料体系中,在N2气氛中常压烧结制备莫来石-SiC晶须复合材料。结果表明,ZrO_2纤维可以促进了莫来石复合材料的烧结,提高复合材料的断裂韧性和抗热震稳定性。ZrO_2纤维的加入量为15wt.%时,材料的断裂韧性和抗热震稳定性到峰值,其断裂韧性为5.73 MPa·m^(1/2),抗热震次数达到47次。过量加入ZrO_2纤维导致其促烧结能力降低会对莫来石-SiC晶须复合材料的机械性能和抗热震稳定性产生不利影响。In order to improve the mechanical property and the thermal shock resistance of the mullite composite, the ZrO_2 fiber was introduced into the system of the mullite-SiC whisker composite which was prepared with the method of pressureless sintering in nitrogen. The result shows that introduction of ZrO_2 fiber can promote the sintering of the mullite composite,and enhance the fracture toughness property and the thermal shock resistance of the mullite composite.When the addition of ZrO_2 fiber was 15 wt.%,the fracture toughness property of the composite that reached the highest,was 5.73 MPa·m^（1/2）,and the thermal shock resistance of the composite that was maximum value,attained 47 times.The poor sintering resulted from the overmuch addition of ZrO_2 fiber has a negative performance impact of the mechanical property and the thermal shock resistance of the mullite-SiC whisker composite.

关 键 词：莫来石-SiC晶须复合材料 ZrO2纤维 机械性能 抗热震性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]