Effects of reactive element oxides on the isothermal oxidation of β-NiAl coatings fabricated by spark plasma sintering

SURFACE & COATINGS TECHNOLOGY

卷:357

Article

Chen, Wenfu¹  He, Limin²  Guo, Yi³  Shan, Xiao¹  Li, Jianghua⁴  Guo, Fangwei¹  Zhao, Xiaofeng¹  Ni, Na⁵  Xiao, Ping³ 

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[2] Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China

[3] Univ Manchester, Sch Mat, Grosvenor St, Manchester M1 7HS, Lancs, England

[4] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China

[5] Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai, Peoples R China

关键词: NiAl;    Coatings;    Reactive element oxide;    Oxidation;    Spallation;   

DOI  :  10.1016/j.surfcoat.2018.10.021

来源: Elsevier

【 摘 要 】

The CeO2, Y2O3 and HfO2 doped beta-NiAl coatings with controlled concentrations were fabricated on Hastelloy substrates using spark plasma sintering. The effects of reactive element oxide (REO) species and concentrations on the isothermal oxidation of the beta-NiAl coatings were investigated. It was found that the addition of Y2O3 and HfO2 improved the oxidation performance of beta-NiAl coatings, but CeO2 with high concentrations (0.5 at.%) had a detrimental effect. At low concentration (0.05 at.% and 0.1 at.%), HfO2 was less effective in improving the oxidation resistance of beta-NiAl compared with Y2O3 and CeO2, while HfO2 at higher concentration of 0.5 at.% was the most effective among the three. The effects of REO species and concentrations on the NiAl oxidation behavior were further discussed in related to the intrinsic properties of the REOs and the chemical compositions of the substrate.

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