Preparation and properties of TaC/Ti3SiC2 composites
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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404 MPa,断裂韧性为4.10 MPa·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。Abstract: 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·m1/2, respectively.The addition of TaC makes TaC/Ti3SiC2 composites possess superior oxidation resistance than Ti3SiC.
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Key words:
- TaC /
- Ti3SiC2 /
- composites /
- phase composition /
- microstructure /
- mechanical property /
- oxidation resistance
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