金属间化合物NiAl的氧化行为与硼含量的关系

CORRELATION BETWEEN OXIDATION BEHAVIOUR AND BORON CONTENT IN Ni_3Al

本文研究了含硼量为0-2.22at.-％的Ni_3Al在750-1150℃和3-100h条件下的氧化行为。结果表明,不同硼含量的Ni_3Al合金在不同温度下的氧化动力学曲线基本都符合抛物线规律。硼含量在0.52-1.37at。-％时抗氧化性能最好。研究了氧化膜的形态与结构。0-1.37at.-％B的Ni_3Al合金,表面形成以Al_2O_3为主的氧化膜,并含有少量NiO和NiAl_2O_4,含有2.22at.-％B的Ni_3Al合金,表面生成复杂的硼氧化物,破坏Al_2O_3膜的完整性,抗氧化性最差。但无硼合金中,NiAl_2O_4的含量最高,并在试样冷却过程中几乎全部剥离。

The effect of boron content (0 to 2.22 at.-%) on isothermal oxida-tion behaviour of Ni_3Al at 750 to 1150℃ for 3 to 100h has been studied. Theresults show that the isothermal oxidation kinetics of Ni_3Al with various B contentsat different temperatures obeys the parabolic law. The compounds with 0.52 to1.37 at.%B show the best oxidation resistance. The morphology and microstructureof the scales have also been investigated.