TaC/Ti3SiC2复合材料的制备与性能

采用反应热压烧结法制备了TaC/Ti₃SiC₂复合材料,借助XRD、SEM、能谱仪以及热重分析等,研究了TaC含量对TaC/Ti₃SiC₂复合材料的相组成、显微结构、力学性能和抗氧化性的影响。结果表明: 采用反应热压烧结法可以制备出致密的TaC/Ti₃SiC₂复合材料,该复合材料的主晶相为Ti₃SiC₂和TaTiC₂,还含有少量的TiC;随着TaC含量的增加,TaC/Ti₃SiC₂复合材料的弯曲强度和断裂韧性呈现先增大后降低的变化趋势,当TaC含量为30wt%时,二者均达到最大值,此时弯曲强度为404 MPa,断裂韧性为4.10 MPa·m^1/2;TaC的引入,使TaC/Ti₃SiC₂复合材料抗氧化性能明显优于Ti₃SiC₂材料。

Preparation and properties of TaC/Ti3SiC2 composites

TaC/Ti₃SiC₂ composites were prepared by reactive hot-pressed sintering.Effects of TaC content on the phase composition, microstructure, mechanical properties and oxidation resistance of TaC/Ti₃SiC₂ composites were investigated by means of X-ray diffraction analysis, scanning electronic microscopy, energy disperse spectroscopy and thermogravimetry.The results show that dense TaC/Ti₃SiC₂ composites can be prepared by reactive hot-pressed sintering.The main phases are Ti₃SiC₂ and TaTiC₂, minor phase is TiC.The bending strength and fracture toughness of TaC/Ti₃SiC₂ composites increase firstly and then decrease with TaC content increasing, and reach the maximum value when the content of TaC is 30wt%.The bending strength and fracture toughness of the composite are 404 MPa and 4.10 MPa·m^1/2, respectively.The addition of TaC makes TaC/Ti₃SiC₂ composites possess superior oxidation resistance than Ti₃SiC.