SiC晶须含量对ZrC陶瓷性能与组织的影响  

Effect of SiC Whisker Content on the Properties and Microstructure of the ZrC Matrix Ultrahigh Temperature Ceramics

作　　者：李金平[1] 李玲玲[1] 王智博[1] 柳青[1] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150080

出　　处：《稀有金属材料与工程》2013年第S1期238-240,共3页Rare Metal Materials and Engineering

基　　金：重点实验室开放基金资助(HIT.KLOF.2009034);哈工大科技创新基金资助(HIT.NSRIF.2008.38)

摘　　要：以微米ZrC颗粒、SiC晶须为原料(SiC晶须体积含量分别为5%,10%,15%,20%),采用热压烧结工艺制备SiC晶须增韧ZrC基超高温陶瓷,研究了SiC晶须含量对ZrC基超高温陶瓷力学性能与组织的影响。结果表明:随着SiC晶须含量的增加,材料的致密度、抗弯强度和断裂韧性逐渐提高;当SiC晶须体积含量为20%时,致密度、抗弯强度和断裂韧性同时达到最大值,分别为99.24%,626.17MPa,5.03MPa·m1/2。SEM表明,试样微观组织均匀,强韧化机制主要是细晶强化和晶须拔出。The micron ZrC particles and SiC whiskers(volume ratio of SiC whisker is 5, 10, 15 and 20%) were used as the raw materials and the ZrC matrix ultrahigh temperature ceramic composite materials toughened by SiC whiskers were prepared by hot pressing. The effect of the SiC whisker content on the mechanical properties and microstructure of the ZrC matrix ultrahigh temperature ceramics has been studied. The results show that the relative density, bending strength and fracture toughness of the ZrC matrix ultrahigh temperature ceramic composite materials increase gradually with the SiC whisker content. When the content of SiC whisker is 20%, the relative density, bending strength and fracture toughness all reach the maximum value which is 99.24%, 626.17 MPa, 5.03 MPa·m 1/2 , respectively. SEM microscopic analysis shows the microstructure of the specimens is homogeneous. The reinforcing and toughening mechanism of ZrC-SiCw ultrahigh temperature ceramics is mainly fine-grain strengthening and whisker pullout.

关 键 词：热压烧结 超高温陶瓷 ZrC-SiCw 晶须增韧 

分 类 号：TQ174.1[化学工程—陶瓷工业]