Oxidation protection of NiCoCrAlY coatings on γ-TiAl

• 作 者: 王启民 郭明虎 柯培玲 宫骏 孙超 闻立时
• 机 构: Division of Surface Engineering of Materials, Institute of Metal Research, Chinese Academy of Scien
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2005年02期
• 关键词: TiAl overlay dense nominal intermetallic inward gains modulus continuity stabili

The effect of NiCoCrAlY overlay coatings on the oxidation resistance of γ-TiAl was studied at 900 ℃ in static air. To hinder the interdiffusion of the elements, the Al/Al_2O_3 layer was added between the coating and the alloy. The results show that the TiAl alloy exhibits poor oxidation resistance. NiCoCrAlY coating can not effectively protect the γ-TiAl substrate from high temperature oxidation because of the serious interdiffusion between the coating and the substrates. With Al/Al_2O_3 diffusion barrier, the NiCoCrAlY coating exhibits excellent oxidation protection on γ-TiAl alloy.

The effect of NiCoCrAlY overlay coatings on the oxidation resistance of γ-TiAl was studied at 900 ° C in static air. The results show that the TiAl alloy exhibits poor oxidation resistance of the γ-TiAl substrate from high temperature oxidation because of the serious interdiffusion between the coating and the substrates. With Al / Al 2 O 3 diffusion barrier, the NiCoCrAlY coating exhibits excellent oxidation protection on γ -TiAl alloy.