Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature

被引：23

作者：

Texier, Damien ^{[1
]}

Ecochard, Maxime ^{[1
]}

Gheno, Thomas ^{[2
]}

Monceau, Daniel ^{[3
]}

Salem, Mehdi ^{[1
]}

Lours, Philippe ^{[1
]}

机构：

[1] Univ Toulouse, Inst Clement Ader ICA UMR CNRS 5312, CNRS, INSA,UPS,Mines Albi,ISAE SUPAERO, Campus Jarlard, F-81013 Albi 09, France

[2] Univ Paris Saclay, ONERA, DMAS, F-92322 Chatillon, France

[3] Univ Toulouse, CIRIMAT, CNRS, INPT,UPS,ENSIACET, 4 Allee Emile Monso BP-44362, F-31030 Toulouse 4, France

来源：

CORROSION SCIENCE | 2021年 / 184卷 / 184期

关键词：

Oxidation; MCrAlY coating; Isothermal oxidation; Ultrathin samples; Reservoir effect; Breakaway; BREAKAWAY OXIDATION; GROWTH-KINETICS; ISOTHERMAL OXIDATION; TRANSIENT-STAGE; BOND COATS; BEHAVIOR; MICROSTRUCTURE; ALLOYS; CORROSION; SCALES;

D O I：

10.1016/j.corsci.2021.109334

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The high temperature oxidation behavior of an APS processed ??? NiCoCrAlY coating was investigated at 1150 ?C. Ultrathin freestanding coating specimens ranging from 16 to 240 ?m in thickness were tested for short-term oxidation time (< 300 h). Intrinsic chemical failure (InCF) occurred after the full consumption of Al, and resulted in Cr2O3 growth and CrN precipitation at the Al2O3/alloy interface. Mass gain slowed down after InCF, even leading to a mass loss associated with the volatilization of Cr2O3. InCF occurred after [10?20] h and [20?100] h for the - 21 ?m and - 31 ?m-thick specimens, respectively. Severe metal recession was observed after InCF.

引用

页数：15

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