Understanding the initial stage oxidation and microstructural evolution of detonation sprayed NiCoCrAlY bond coat using in-situ high-temperature X-ray diffraction

被引：12

作者：

Kala, Vikrant ^{[1
]}

Santhy, K. ^{[2
]}

Sivakumar, G. ^{[3
]}

Rajasekaran, B. ^{[1
]}

机构：

[1] Natl Inst Technol, Dept Met & Mat Engn, Karnataka NITK, Surathkal 575025, India

[2] Indus Univ, Inst Technol & Engn, Dept Mat & Met Engn, Ahmadabad 382115, India

[3] Int Adv Res Ctr Powder Met & New Mat, Hyderabad 500005, India

来源：

CORROSION SCIENCE | 2022年 / 207卷

关键词：

Nickel (A); Superalloys (A); SEM (B); XRD (B); Rietveld refinement (B); And selective oxidation (C); THERMAL BARRIER COATINGS; ISOTHERMAL OXIDATION; CORROSION-RESISTANCE; BEHAVIOR; DEPOSITION; GROWTH; HVOF; ALLOYS; PHASE;

D O I：

10.1016/j.corsci.2022.110521

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study focuses on in-situ high-temperature X-ray diffraction (HT-XRD) investigation to understand the oxidation, microstructural evolution, and recrystallization of the NiCoCrAlY bond coat. HT-XRD analysis was carried out at a constant temperature of 1423 K for 3 h in a 10(-4) Pa vacuum. The formation of alpha-Al2O3, Cr2O3, Co3O4, and NiCr2O4 oxides and microstructural evolution, such as homogenization of phases (gamma and beta) during in-situ HT-XRD, has been analyzed with FE-SEM (EDS), Density Functional Theory calculations and Rietveld refinement's support. beta-(Ni,Co)Al phase depletion (by 77%) was found at 1423 K during the HT-XRD; however, no TGO formation was noticed.

引用

页数：13

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