(1. 昆明理工大學(xué) 材料與冶金工程學(xué)院，昆明 650093 中國(guó))
(2. Forschungszentrum Juelich, IEF-2, Juelich, 52425, Deutschland)
摘 要: 采用電鍍和滲鋁方法制備鎳基合金的鉑改性鋁化物粘結(jié)層，并對(duì)涂層表面進(jìn)行1 µm表面拋光處理,研究1 100 ℃空氣循環(huán)高溫氧化生成的氧化鋁層的表面形態(tài)和斷面結(jié)構(gòu)。結(jié)果表明，拋光處理可有效地抑制低鉑含量涂層的表面脊背和凸起形成，壓制高鉑含量涂層的生長(zhǎng)層起伏。同時(shí)，量化研究表明，樣品經(jīng)拋光處理后，氧化鋁生長(zhǎng)層的均平方根起伏系數(shù)(RMS)在氧化至1 000 h時(shí)約為1.5，線性長(zhǎng)度起伏(L/L0)在氧化前后基本保持恒定，而表面起伏波長(zhǎng)隨時(shí)間呈增大趨勢(shì)。拋光處理后涂層的氧化鋁粘結(jié)性能較好，并具有較低的氧化鋁生長(zhǎng)速率。
關(guān)鍵字: 鉑；鋁化物粘結(jié)層；高溫氧化；拋光處理
（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
