Oxidation Behavior of Pt–Ir Modified Aluminized Coatings on Ni-base Single Crystal Superalloy TMS-82+
Oxidation Behavior of Pt–Ir Modified Aluminized Coatings on Ni-base Single Crystal Superalloy TMS-82+
复制标题
DOI：
10.1007/s11085-007-9056-z
复制
发表时间：
2007-05
影响因子：
2.2
通讯作者：
A. Suzuki;Ying Wu;A. Yamaguchi;H. Murakami;C. Rae
中科院分区：
文献类型：
--
作者：
A. Suzuki;Ying Wu;A. Yamaguchi;H. Murakami;C. Rae
研究了磁控溅射法制备的铂-Ir改性渗铝涂层的抗氧化性能。循环氧化试验表明，与铂、铂80at%Ir和Ir改性铝化物涂层相比，Pt-30at%Ir和Pt-50at%Ir改性铝化物涂层的质量变化较小。经循环氧化后的横截面分析表明，在铂改性铝化物涂层表面形成的TGO层厚度几乎是铂-30at%Ir和铂-50at%Ir涂层的两倍。另外，经过循环氧化处理后的铂-30at%Ir和铂-50at%Ir涂层的表面比铂改性涂层光滑得多，而后者的表面起皱严重。然而，当涂层中Ir含量超过80at%时，循环氧化过程中会形成内部空洞。结果表明，在铂改性渗铝涂层中添加30~50at%Ir对提高涂层的抗氧化性最为有效。
The oxidation resistance of Pt–Ir modified aluminized coatings, prepared by magnetron sputtering, was investigated. Cyclic oxidation tests revealed that Pt–30 at%Ir and Pt–50 at%Ir modified aluminide coatings demonstrated a smaller mass change compared with Pt, Pt–80 at%Ir and Ir modified aluminide coatings. Cross-sectional analyses following cyclic oxidation tests showed that the TGO layer formed on the Pt modified aluminide coating surface is almost twice as thick as those on the Pt–30 at%Ir and Pt–50 at%Ir coatings. In addition, the Pt–30 at%Ir and Pt–50 at%Ir samples had a much smoother surface than the Pt modified coatings after cyclic oxidation, and the latter suffered from severe surface rumpling. However, when the Ir content exceeded 80 at% in Pt–Ir modified coatings, internal voids formed during cyclic oxidation. These results show that the addition of 30–50 at%Ir to Pt-modified aluminized coatings is most effective in enhancing oxidation resistance.