摘要
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404MPa,断裂韧性为4.10MPa·m1/2;TaC的引入,使TaC/Ti3SiC2复合材料抗氧化性能明显优于Ti3SiC2材料。
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 hotpressed 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 4.10MPa·m1/2,respectively.The addition of TaC makes TaC/Ti3SiC2 composites possess superior oxidation resistance than Ti3 SiC.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2014年第5期1258-1263,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金青年基金(51302206)
