Isothermal Oxidation Behavior of Plasma Sprayed MCrAlY Coatings

Seo, Do Won; Ogawa, Kōichi

doi:10.5772/32731

Cited by 4 publications

(4 citation statements)

References 25 publications

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“…SEM micrographs and EDS analysis of A and B points (marked with arrows in these micrographs) from the YSZ/TGO interface of the coatings of 600D60 and conventional YSZ after oxidation at 1000°C for 200 h are shown in Figure 14 [44,46]. This detrimental oxide (spinel-type) has been reported in the literature [44,47]. The formation mechanism of this compound is according to the The formation of Ni, Cr-rich spinel oxides such as Ni(Cr, Al) 2 O 4 and NiCr 2 O 4 in the TGO layer protrusions results in the rapid localized volume increase that leads to the micro-cracks formation in the YSZ/ TGO interface [48].…”

Section: Isothermal Oxidationsupporting

confidence: 53%

“…The mixed oxides in A points of the TGO layer of the conventional YSZ coating (Figure 14(b)) can be considered as spinel of Ni(Cr, Al) 2 O 4 due to the presence of 12 at.-% Al, 26 at.-% Cr, 10 at.-% Ni [44,46]. This detrimental oxide (spinel-type) has been reported in the literature [44,47]. The formation mechanism of this compound is according to the following reactions: …”

Section: Resultsmentioning

confidence: 90%

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Characterization and oxidation behaviour of nanostructured La ₂ (Zr _0.7 Ce _0.3 ) ₂ O ₇ /YSZ coatings prepared by calcined precursor precipitate plasma spraying

Taleghani

Valefi

Ehsani

2020

Surface Engineering

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In this study, La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 nanostructured coatings were applied by plasma spraying of the nanostructured agglomerates. Initial nanostructured precursor, precursors calcined at 400°C, 600°C and 900°C with La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 compound were used to apply top coat layer of the coatings. XRD results and microstructural observations indicated that a uniform distribution of LC phase in LZ matrix was obtained in the coatings applied by the precursors calcined at 400°C, 600°C and 900°C. The coatings were composed of vertical cracks. The isothermal oxidation results showed that TGO layer in the coating applied by the precursor calcined at 600°C (coating 600D60) was composed of Al 2 O 3 protective compound. While, TGO layer in the conventional YSZ coating contained both compounds of protective Al 2 O 3 and Ni(Cr, Al) 2 O 4 detrimental spinel. The coating 600D60 had better isothermal oxidation resistance compared to the conventional YSZ. But, its thermal cycling resistance was approximately equal to the conventional YSZ.

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Section: Isothermal Oxidationsupporting

confidence: 53%

Section: Resultsmentioning

confidence: 90%

Characterization and oxidation behaviour of nanostructured La ₂ (Zr _0.7 Ce _0.3 ) ₂ O ₇ /YSZ coatings prepared by calcined precursor precipitate plasma spraying

Taleghani

Valefi

Ehsani

2020

Surface Engineering

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“…3. TBC structure, produced by APS technique, has high porosity, oxide content and such other failures, owing to manufacture conditions which has been adopted by other researchers [25][26][27].…”

Section: As-deposited Coating Characterizationmentioning

confidence: 99%

Effect of shot peening on the oxidation behavior of thermal barrier coatings

Karaoğlanlı

Döleker

Demirel

et al. 2015

Applied Surface Science

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“…Hence, 'hot corrosion' has been called 'deposit-induced accelerated oxidation' [1]. MCrAlY-type coatings (where M denotes Ni, Co or NiCo) have been widely used as overlay coatings individually or as bond coatings in thermal barrier coatings for the oxidation and hot corrosion resistance of hot-section components of gas turbine engines [3][4][5][6]. The good protection afforded by MCrAlY-type coatings should be definitely attributed to the formation of dense and adherent alumina and/or chromia scales [7].…”

Section: Introductionmentioning

confidence: 99%

Behaviour and Mechanisms of Alkali Metal Sulphate-Induced Cyclic Hot Corrosion in Relation to Gradients and Preoxidised MCrAlY-Type Coatings

Gong

Sun

et al. 2022

Coatings

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In this study, two modified MCrAlY-type coatings were prepared by the same arc ion plating process. ‘Gradient annealing’ and ‘gradient annealing plus preoxidation’ were adopted as post-treatments for the two coatings. A two-layer scale of a mixed oxide layer and a pure alumina layer with the alumina next to the substrate was formed on the latter coating. A cyclic hot corrosion test was carried out on them with a conventional MCrAlY-type coating as a reference. The kinetics and evolution of the microstructure showed them to have greater hot corrosion resistance at 900 °C. The preformed inner alumina scale by preoxidation retarded the occurrence of internal oxidation–sulphidation to some extent. Additionally, the internal sulphidation–oxidation model is elucidated and extended.

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Isothermal Oxidation Behavior of Plasma Sprayed MCrAlY Coatings

Cited by 4 publications

References 25 publications

Characterization and oxidation behaviour of nanostructured La ₂ (Zr _0.7 Ce _0.3 ) ₂ O ₇ /YSZ coatings prepared by calcined precursor precipitate plasma spraying

Characterization and oxidation behaviour of nanostructured La ₂ (Zr _0.7 Ce _0.3 ) ₂ O ₇ /YSZ coatings prepared by calcined precursor precipitate plasma spraying

Effect of shot peening on the oxidation behavior of thermal barrier coatings

Behaviour and Mechanisms of Alkali Metal Sulphate-Induced Cyclic Hot Corrosion in Relation to Gradients and Preoxidised MCrAlY-Type Coatings

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Isothermal Oxidation Behavior of Plasma Sprayed MCrAlY Coatings

Cited by 4 publications

References 25 publications

Characterization and oxidation behaviour of nanostructured La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 /YSZ coatings prepared by calcined precursor precipitate plasma spraying

Characterization and oxidation behaviour of nanostructured La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 /YSZ coatings prepared by calcined precursor precipitate plasma spraying

Effect of shot peening on the oxidation behavior of thermal barrier coatings

Behaviour and Mechanisms of Alkali Metal Sulphate-Induced Cyclic Hot Corrosion in Relation to Gradients and Preoxidised MCrAlY-Type Coatings

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Product

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Characterization and oxidation behaviour of nanostructured La ₂ (Zr _0.7 Ce _0.3 ) ₂ O ₇ /YSZ coatings prepared by calcined precursor precipitate plasma spraying

Characterization and oxidation behaviour of nanostructured La ₂ (Zr _0.7 Ce _0.3 ) ₂ O ₇ /YSZ coatings prepared by calcined precursor precipitate plasma spraying