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为考察稀土元素Y对NiAl-Al2O3抗氧化性能的影响,通过脉冲电流辅助烧结(PCAS)制备了NiAl-Al2O3和NiAl-Al2O3-Y块体材料,并在1000℃下测试了材料的恒温氧化和循环氧化性能。结果表明,稀土元素Y对NiAl-Al2O3的氧化产物没有影响。恒温氧化后,NiAl-Al2O3和NiAl-Al2O3-Y表面都形成一层α-Al2O3氧化膜。Y的添加改变了氧化膜的形貌并造成了屋脊状形貌的消失。此外,NiAl-Al2O3-Y的质量增加也明显较少。在热循环测试中,NiAl-Al2O3-Y的氧化膜中没有观察到NiAl-Al2O3中常见的裂纹和剥离现象,这是由于Y能够阻碍Al2O3的θα转化并减少空洞的形成所造成的。
In order to investigate the effect of rare earth element Y on the oxidation resistance of NiAl-Al2O3, NiAl-Al2O3 and NiAl-Al2O3-Y bulk materials were prepared by pulse current assisted sintering (PCAS) Cyclic oxidation performance. The results show that rare earth element Y has no effect on the oxidation products of NiAl-Al2O3. After thermostatic oxidation, a layer of α-Al2O3 oxide film was formed on the surface of NiAl-Al2O3 and NiAl-Al2O3-Y. The addition of Y changed the morphology of the oxide film and caused the disappearance of the roof-like morphology. In addition, the mass increase of NiAl-Al2O3-Y is also significantly less. In the thermal cycling test, the common cracks and delamination in NiAl-Al2O3 was not observed in the oxide film of NiAl-Al2O3-Y due to the fact that Y can hinder the θα transformation of Al2O3 and reduce the formation of voids.