采用金属钛粉和碳化硼为初始粉料, 利用SPS放电等离子烧结技术制备了致密的纳米结构TiB2/TiC复合材料. 并借助XRD、SEM考察了复合材料的相组成和显微结构, 利用压痕法和小样品力学性能测试方法(MSP)测定了室温显微硬度、断裂韧性和MSP强度. 研究结果表明: 利用一步法直接升温至1550℃并保温6 min制备的复合材料, 其晶粒尺寸大于1 μm, MSP强度为833 MPa. 而采用两步法升温至1550℃, 然后迅速降低保温温度至1450℃, 并保温6 min条件下使金属钛粉和碳化硼同步完成反应、烧结、致密化, 生成晶粒细小的TiB2/TiC复合材料, 晶粒尺寸大约为200 nm, 并且所制备的复合材料力学性能更好, MSP强度达到1095 MPa.
TiB2/TiC composites were in situ fabricated through spark plasma sintering (SPS) technique using Ti and B4C powders as starting materials. The phase constituent of the samples was analyzed by X-ray diffraction techniques and microstructures were observed by scanning electron microscope. The Vickers hardness, fracture toughness and MSP strength at room temperature was measured by indentation method and Modified Small Punch (MSP) test. The results showed that the TiB2/TiC composite fabricated by one-step sintering (sintering at 1550℃ for 6 min) has an average grain size greater than 1 μm with MSP strength of 844 MPa. While the TiB2/TiC composite with an average grain size of about 200 nm could be fabricated by two-step sintering (at higher sintering temperature of 1550℃ and lower holding temperature of 1450℃) and its MSP strength reached as high as 1095 MPa.
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