(1. 昆明理工大学 材料与冶金工程学院，昆明 650093 中国)
(2. Forschungszentrum Juelich, IEF-2, Juelich, 52425, Deutschland)
摘 要: 采用电镀和渗铝方法制备镍基合金的铂改性铝化物粘结层，并对涂层表面进行1 µm表面抛光处理,研究1 100 ℃空气循环高温氧化生成的氧化铝层的表面形态和断面结构。结果表明，抛光处理可有效地抑制低铂含量涂层的表面脊背和凸起形成，压制高铂含量涂层的生长层起伏。同时，量化研究表明，样品经抛光处理后，氧化铝生长层的均平方根起伏系数(RMS)在氧化至1 000 h时约为1.5，线性长度起伏(L/L0)在氧化前后基本保持恒定，而表面起伏波长随时间呈增大趋势。抛光处理后涂层的氧化铝粘结性能较好，并具有较低的氧化铝生长速率。
关键字: 铂；铝化物粘结层；高温氧化；抛光处理
（1. Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology,
Kunming 650093, China;
2. Forschungszentrum Juelich, IEF-2, Juelich, 52425, Deutschland）
Abstract:Platinum modified aluminide bond coats on nickel base superalloy CMSX-4 were fabricated by electroplating and Al diffusion saturation technology. And the alumina surface morphology and cross-section microstructure of polished samples were studied after cyclic oxidation in air at 1 100 ℃. The results show that the oxides ridges and protrusions on low Pt content coatings are suppressed by surface polished treatment. And the thermally grown oxide (TGO) undulation of high Pt content coatings is also inhibited. Root-mean-square roughness (RMS) is about 1.5 after 1 000 h cyclic oxidation and linear roughness (L/L0) is rapidly diminishing through quantitative studied for polished Pt-modified aluminide compared with as-aluminized bond coats. However, the wavelength of TGO undulations shows a little increasing trend. From further study, the polishing treatment bond coats show better TGO adherence and lower alumina growth rate.
Key words: platinum; aluminide bond coats; high temperature oxidation; polishing treatment
