艾云龙,刘长虹,李玲艳,何文,陈同彩

• 1:南昌航空大学材料科学与工程学院

摘要(Abstract)：

通过热压烧结制备SiC(W)-ZrO2-MoSi2复相陶瓷,利用X射线衍射仪、图像分析仪、透射电镜对复相陶瓷试样组织结构进行了研究,探讨了SiC(W)-ZrO2协同作用对MoSi2陶瓷性能的影响。结果表明:纳米ZrO2颗粒的加入对材料的细化作用较SiC晶须明显,复相协同作用细化效果更好。SiC(W)-ZrO2协同作用的综合机制有利于提高复相陶瓷的抗弯强度和断裂韧性,ZrO2量的增加对提高复相陶瓷断裂韧性的作用更明显;ZrO2粒子钉扎位错,导致可动位错绕过,强化材料基体。弥散分布的SiC晶须阻碍位错运动,使位错缠结、交割,阻碍晶界迁移;粒子周围出现孪晶以及SiC晶须引起的层错,阻碍其晶粒长大。

关键词(KeyWords)： SiC(W)-ZrO2;MoSi2复相陶瓷;组织;力学性能;位错

Abstract:

Keywords:

基金项目(Foundation): 航空基础科学基金项目(04G56008);; 江西省自然科学基金项目(2009GZC0107)

作者(Author): 艾云龙,刘长虹,李玲艳,何文,陈同彩

DOI: 10.13289/j.issn.1009-6264.2010.08.001

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