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多弧离子镀Cr2O3涂层对γ-TiAl抗氧化性能的影响

, PP. 266-268

Keywords: Cr2O3,多弧离子镀,氧化,γ-TiAl

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Abstract:

用多弧离子镀技术在γ-TiAl金属间化合物表面制备了Cr2O3涂层,用SEM/EDX线扫描分析等手段研究了该涂层在900℃下的循环氧化行为.结果表明,γ-TiAl表面沉积Cr2O3涂层后,明显提高了γ-TiAl的抗循环氧化能力;在氧化过程中TiAl/Cr2O3界面处的低氧压促进了Al的选择性氧化,在TiAl一侧生成了一层富Al氧化物,该层富Al氧化物较好地阻止了TiAl中Ti的外扩散,从而抑制了TiO2的生长.

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