1050℃ ISOTHERMAL OXIDATION RESISTANCE OF TWO NiCrAlY COATINGS

J Chin Soc Corr Pro

2002, Vol. 22

Issue (6): 339-342 DOI:

Research Report

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1050℃ ISOTHERMAL OXIDATION RESISTANCE OF TWO NiCrAlY COATINGS

Yujuan Zhang;Xiaofeng Sun;Tao Jin

中国科学院金属研究所

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Abstract NiCrAlY coatings,respectively prepared by detonatio n spray (DS)and low-pressure plasma spray (LPPS),were deposited on a single crys tal Ni-base superalloy.Specimens were isothermally oxidized at 1050℃ for 300h.B y means of XRD,SEM and EDS,oxidation behaviors of the coatings were analyzed.The results showed that Al2O3 protective scale was formed on both DS NiCrAlY co ating and LPPS NiCrAlY coating.Their oxidation kinetics obeyed the parabolic law .Since DS coating entrapped the air,its internal oxide appeared earlier and much more than that of LPPS coating,which lead to a relatively rapid weight gain.The oxidation rate constant of DS NiCrAlY coating is about two times of that of LPP S coating.Some spallation occurred on the oxide scale of DS coating after oxidiz ed for 300 hours,while the oxide scale of LPPS coating kept almost intact except for a few microcracks on the protuberances.

Key words: DS LPPS NiCrAlY coating oxidation resistance

Received: 28 April 2002

ZTFLH:

TG174.44

Corresponding Authors: Yujuan Zhang E-mail: yjzhang@imr.ac.cn

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Yujuan Zhang; Xiaofeng Sun; Tao Jin. 1050℃ ISOTHERMAL OXIDATION RESISTANCE OF TWO NiCrAlY COATINGS. J Chin Soc Corr Pro, 2002, 22(6): 339-342 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I6/339

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