Effect of Pt-doping on the oxidation behaviors of the γ'-Ni3Al and β-NiAl phases in the NiSiAlY alloy. (15th May 2022)

• Record Type: Journal Article
• Authors: Yu, Miao; Sun, Qinshuo; Wang, Qiong; Li, Xiaojing; Zhou, Dapeng; Pu, Jibin; Chen, Beibei; Li, Changsheng
• Is Part Of: Corrosion science. Volume 200(2022)
• Publication Date: 2022-05-15
• Subjects: NiSiAlY alloy -- Pt effects -- γ'-Ni3Al phase -- β-NiAl phase -- Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110224
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The oxidation behaviors of the NiSiAlY+xPt (x = 0, 1, 5 and 10 wt%) alloys were investigated at 900 ℃, with the focus on the Pt effect, phase and oxidation stage. The doped Pt improved the oxidation resistance but caused different oxidation behaviors in β-NiAl and γ'-Ni3 Al phases. During the initial oxidation process, the Pt-doped NiSiAlY alloys showed a faster increase in mass gain, which was mainly contributed by the β-NiAl phase. However, at the stable oxidation stage, the undoped NiSiAlY alloy had the highest oxide growth rate, it was dominated by the oxidation behavior of the γ'-Ni3 Al phase. Highlights: The NiSiAlY+xPt (x = 0, 1, 5 and 10 wt%) alloys were prepared by arc melting. The oxidation behaviors of the tested alloys were investigated, focusing on the phases, oxidation stages and Pt effects. For theγ'-Ni3Al phase, the doped Pt suppressed the formation of NiO and pores. For the β-NiAl phase, Pt improved the adhesion of oxide scales.