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采用放电等离子烧结(SPS)制备碳化钽(TaC)颗粒增强钛基复合材料,通过X射线衍射仪、扫描电镜和电子探针分析了复合材料的微观组织和力学性能。结果表明:SPS制备方法在温度高于800℃烧结可得到致密TaC/Ti复合材料;TaC显著提高钛的硬度和强度,加入5%TaC复合材料的维氏硬度高于500 MPa,抗弯强度高于600 MPa;烧结过程中发生固相扩散反应,TaC与金属钛反应被消耗,析出分布均匀的(Ti,Ta)C1-x碳化物,分解出的Ta固溶于钛金属基体;第二相强化与固溶强化2种强化机制的共同作用使复合材料强度、硬度大幅度提高。
Tantalum carbide (TaC) particles reinforced titanium matrix composites were prepared by spark plasma sintering (SPS). The microstructure and mechanical properties of the composites were analyzed by X-ray diffraction, scanning electron microscopy and electron probe. The results show that the compactness of TaC / Ti composites can be obtained by sintering at higher temperature than 800 ℃. The hardness and strength of TaC are obviously increased. The Vickers hardness of 5% TaC composites is higher than 500 MPa and the flexural strength is high (Ti, Ta) C1-x carbides are precipitated and the decomposed Ta solid solution is dissolved in the titanium metal matrix. The second phase Intensification and solid solution strengthening two kinds of strengthening mechanism of the joint action of the composite material strength, hardness increased dramatically.