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探讨了利用双层辉光等离子渗金属技术(DGPSAT)溅射NiCrMoNb合金化层对TiAl金属间化合物静止空气中高温氧化抗力的影响。结果表明,不处理的TiAl由于TiO2为主的氧化层的剥落抗氧化性能较差,而TiAl-NiCrMoNb合金层由于形成了致密、晶粒细小的富Al2O3层而使TiAl抗氧化性能大大提高。合金层与基体之间存在互扩散,Ni,Cr,Mo,Nb的界面富集导致界面化学性质的很大改变。
The effect of NiCrMoNb alloying layer on the high temperature oxidation resistance in still air of TiAl intermetallics was investigated by using DGPSAT sputtering. The results show that the untreated TiAl has poor anti-oxidation properties due to flaking of the TiO2-based oxide layer, while the TiAl-NiCrMoNb alloy layer greatly improves the oxidation resistance of TiAl due to the formation of a dense, fine-grained Al2O3-rich layer. Interdiffusion exists between the alloy layer and the substrate, and the interface enrichment of Ni, Cr, Mo, Nb leads to a great change of interface chemical properties.