加入TaC对Ti_3SiC_2陶瓷材料性能的影响

Effect of Addition of TaC on Properties of Ti_3SiC_2 Ceramics

采用反应热压烧结法制备了含有20%TaC(质量分数,下同)的TaC/Ti3SiC2材料,并对其相组成、力学性能和抗氧化性能进行了研究。结果表明:(1)随着热压温度的升高,试样的致密度、弯曲强度和断裂韧度有所提高;(2)20%TaC/Ti3SiC2材料抗氧化性能优于纯Ti3SiC2材料和20%SiC/Ti3SiC2材料;(3)20%TaC/Ti3SiC2材料形成的氧化层分为两层,外层氧化物主要为TiO2,内层氧化物主要为TiO2、SiO2及TiO2与Ta2O5的共熔物。

The material of 20%（mass fraction, same below） TaC/Ti3SiC2 was prepared by reactive hot pressing method. The phase constituent, mechanical properties and oxidation resistance were investigated. The results showed that：（1） The densification, flexural strength and fracture toughness of 20%TaC/Ti3SiC2 increase with the increase of hot pressing temperature; （2） The oxidation resistance of 20% TaC/Ti3SiC2 is much higher than that of monolithic Ti3SiC2 and 20% SiC/Ti3SiC2 composites; （3） The oxidized layers of TaC/Ti3SiC2 are composed of two layers. The outer layer is TiO2. And the inner layer is the mixture of TiO2, SiO2 and the eutectoid of TiO2 and Ta2O5.