多弧离子镀Cr涂层对γ-TiAl合金高温氧化性能的影响

Effect of Multi-Arc Ion Plating Chromium Films on the High Temperature Oxidation Resistance of γ-TiAl Alloy

摘要:

采用多弧离子镀技术在γ-TiAl合金表面制备Cr涂层，用SEM/EDS和XRD 等手段研究了该涂层对γ-TiAl合金在高温下氧化性能的影响。结果表明，涂层在高温下可形成保护性氧化膜，氧化膜主要分为内外两层，其中外层氧化膜在650 ℃下主要为Cr2O3，在750 ℃下为TiO2，在950 ℃为Al2O3，内层氧化膜均为Ti-Al-Cr的混合氧化膜，Ti-Al-Cr的互扩散层可有效阻止氧向基体扩散，显著提高了γ-TiAl的抗高温氧化能力

Abstract:

Chromium coatings were deposited on γ-TiAl alloy by multi-arc ion plating (MAIP). The high temperature oxidation resistance of the coatings was tested by SEM, EDX and XRD. The results show that the coating at high temperature can form a protective oxide film. The oxide film is mainly divided into two layers. The outer part at 650 oC is Cr2O3, at 750 oC is TiO2 and at 950 oC is Al2O3. The inner oxide film is Ti-Al-Cr mixed oxide film. The Ti-Al-Cr diffusion layer can effectively prevent the diffusion of oxygen into the substrate, and thus significantly improve the γ-TiAl high-temperature oxidation resistance ability