摘要
（TiB2＋TiC）/Ni3Al composites were prepared by mechanical alloying of elemental powders and subsequently spark plasma sintering.Microstructure of（TiB2＋TiC）/Ni3Al composite sintered at 950°C was finer than that of composite sintered at 1050°C.The influence of grain size on cyclic oxidation behavior was investigated.Cyclic oxidation results showed that the composite sintered at 950°C had smaller mass gains than the composite sintered at 1050°C.XRD and EDS results indicate that finer grain size is beneficial for increasing the oxidation resistance by improving the formation of a continuous TiO2 outer layer and a continuous Al2O3 inner layer on the surface of the composites sintered at 950°C.
采用放电等离子烧结法制备(TiB2+TiC)/Ni3Al复合材料。在950°C下烧结的(TiB2+TiC)/Ni3Al复合材料的组织比在1050°C下烧结的(TiB2+TiC)/Ni3Al复合材料的组织更细小。对烧结温度分别为950°C和1050°C的复合材料在900°C下进行循环氧化性能测试。结果表明,在950°C下烧结的复合材料的循环氧化质量损失要小于在1050°C下烧结的复合材料的。晶粒细化有助于在氧化过程汇总的选择性氧化,使得连续的TiO2和Al2O3氧化膜得以在复合材料表面形成,从而提高复合材料的抗氧化性能。
基金
Project(QC2010110)supported by Heilongjiang Province Natural Science Foundation,China
