Improved oxidation resistance of γ-TiAl intermetallics by sputtered Ni+CrAlYHfSiN composite coating
Improved oxidation resistance of γ-TiAl intermetallics by sputtered Ni+CrAlYHfSiN composite coating
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DOI：
10.1016/j.corsci.2021.109510
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发表时间：
2021-07
影响因子：
8.3
通讯作者：
Yingfei Yang;Qin Xiao;P. Ren;Wei Li;Shenglong Zhu;Fu-hui Wang
中科院分区：
文献类型：
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作者：
Yingfei Yang;Qin Xiao;P. Ren;Wei Li;Shenglong Zhu;Fu-hui Wang
采用磁控溅射技术在γ-TiAl合金上沉积NiCrAlYHfSi涂层和Ni+CrAlYHfSiN涂层。本工作主要研究裂纹对涂层抗氧化性能的影响，以及氮化物掺杂对裂纹的抑制作用。结果发现，随着氧化时间的延长，NiCrAlYHfSi涂层中的纵向裂纹增多。 NiCrAlYHfSi 涂层中的裂纹为 Ti 和 O 离子提供了快速扩散通道。 Ni+CrAlYHfSiN涂层在整个氧化过程中保持完整无裂纹。由于氮化物的“固定效应”，Ni+CrAlYHfSiN复合涂层有效抑制Ti扩散到表面破坏Al2O3氧化皮的完整性。
NiCrAlYHfSi coating and Ni+CrAlYHfSiN coating were deposited on γ-TiAl alloy by magnetron sputtering. This work mainly focuses on the influence of cracks on the oxidation resistance of coatings, and the suppression cracking effect by doping nitrides. It was found that longitudinal cracks in the NiCrAlYHfSi coating increase with oxidation time prolonged. Cracks in NiCrAlYHfSi coating provide quick-diffusion channels for Ti and O ions. The Ni+CrAlYHfSiN coating is intact crack free during the whole oxidation process. Owing to the “fix effect” of nitrides, the Ni+CrAlYHfSiN composite coating effectively inhibits Ti diffusing to the surface to destroy the integrity of Al2O3scale.