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利用放电等离子烧结技术(SPS)制备出相对密度、断裂韧性、弯曲强度分别为99.74%、19.73±0.4MPa·m1/2、1002±12MPa的40vol%Ti/Al2O3复合材料。SEM对复合材料表面形貌观察发现,Ti、Al2O3两相分布均匀,表面无明显气孔存在;断口的SEM和EDS表明,复合材料已形成网络导电结构;复合材料的HREM微观结构分析表明,Al2O3三角晶界处无其它杂质的偏聚,小颗粒的金属Ti富集在Al2O3的三角晶界结合处,界面结合紧密。
The 40vol% Ti / Al2O3 composites with relative density, fracture toughness and flexural strength of 99.74%, 19.73 ± 0.4MPa · m1 / 2 and 1002 ± 12MPa were prepared by spark plasma sintering (SPS) SEM observation of the surface morphology of the composites showed that the two phases of Ti and Al 2 O 3 were uniformly distributed and there was no obvious pores on the surface. The SEM and EDS of the fracture showed that the composites formed the network conductive structure. The HREM microstructure of the composites showed that Al2O3, There is no segregation of other impurities in the grain boundaries. Small particles of metal Ti are enriched in the junction of the triangular grain boundaries of Al2O3 and the interface is tightly bonded.