A Comparison of Oxidation Behavior of Al Coatings Prepared by Magnetron Sputtering and Arc Ion Plating on gamma-TiAl

作者：Xu Yi; Miao Qiang^*; Liang Wenping; Wang Ling; Yu Xiushui; Ren Beilei; Yao Zhengjun

来源：Rare Metal Materials and Engineering, 2014, 43(11): 2652-2656.

• magnetron sputtering
• arc ion plating
• Al coating
• oxidation resistance

The micro-structure, the morphology and the oxidation resistance of Al coatings deposited using magnetron sputtering (MS) and arc ion plating (AIP) were investigated by means of SEM,EDS and XRD. A more compact and uniform Al coating with small grain size was deposited on gamma-TiAl by MS method. A protective surface structure consisting of an oxide scale, an Al-rich layer and an interdiffusion layer was formed after oxidation test. However, the Al coatings prepared by AIP showed a poorer oxidation resistance due to the existence of a large amount of pores in the coatings, which played a role of channels for oxygen transportation and induced seriously the internal oxidation and the coating degradation finally. The non-protective scales consisting of Al2O3 and TiO2 were formed after quasi-isothermal oxidation test at 900 degrees C for 173 h. The results indicate that the Al coatings deposited by MS exhibit a better oxidation resistance than those by AIP.

• 出版日期2014-11
• 单位南京大学