Surface Characterization of Nickel-Base Superalloy Powder
The chemical composition and thickness of the oxide layer on the nickel-base superalloy powder significantly determined the quality of the powder metallurgy nickel-base superalloy and subsequent mechanical properties. To investigate the oxidation behavior of the nickel-base superalloy powders, the surface layer of as-atomized superalloy powder was systematically characterized by means of X-ray photoelectron spectroscopy and Auger electron spectroscopy. The results show that the oxygen in nickel-base superalloy powders is mainly present as thin surface oxide layer with a thickness of about 7 nm. The heterogeneous oxide, including TiO2, Cr2O3, and Al2O3, hydroxide Ni(OH)2 and absorptive H2O are observed at the surface layer of the superalloy powders.
KeywordsPowder metallurgy Superalloy Oxidation
This work was financially supported by National key R&D program of China (Grant No. 2017YFB0305801). In addition, the author would appreciate Dr. Liu Chen for his kindly help.
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