Oxidation behaviour of electron beam physical vapour deposition β-NiAlHf coatings at 1100 °C in dry and humid atmospheres
作者： Kai Yan , Hong-Bo Guo , Hui Peng , Sheng-Kai Gong
DOI: 10.1007/S12598-015-0487-4
关键词:
摘要: NiAl intermetallic compounds attract increasing attention for high-temperature applications due to their combination of excellent properties, especially as metallic protective coatings on superalloys or bond coats in thermal barrier (TBCs). Oxidation behaviour the β-NiAlHf prepared by electron beam physical vapour deposition (EB-PVD) was investigated at 1100 °C short time and 100 h 20 % O2 + Ar 15 % H2O + Ar, respectively. The results mass changes reveal that addition minor reactive element Hf significantly improves cyclic oxidation resistance β-NiAl both dry humid atmospheres. During initial stage, water retards phase transformation from θ-Al2O3 α-Al2O3. Moreover, compared with case atmosphere, reduces surface roughness oxide scales formed EB-PVD after oxidation, which corresponds difference morphologies scales.
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