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000858383 1001_ $$0P:(DE-Juel1)139042$$aJalowicka, A.$$b0
000858383 245__ $$aAlumina Formation and Microstructural Changes of Aluminized CoNiCrAlY Coating During High Temperature Exposure in the Temperature Range 925–1075°C
000858383 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2018
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000858383 520__ $$aMCrAlY (M = Ni, Co) coatings are commonly used on gas-turbine components as oxidation resistant overlay coatings and bondcoats for thermal barrier systems. In the present work the microstructural features and oxidation behavior of an aluminized Co-base MCrAlY-coating on a Ni-based superalloy have been investigated in the temperature range 925–1075 °C. Microstructural studies of the oxidized coatings by SEM/EBSD were complemented with numerical thermodynamic calculations using the software package ThermoCalc. In the as-received condition the outer part of the coating consisted mostly of β-(Ni,Co)Al. Formation of σ-CoCr was observed at the interface between the β-layer and the inner initial CoNiCrAlY. During high-temperature air exposure alumina based surface scales were formed but the oxidation induced Al depletion of the aluminized coating did not result in formation of the γ’-(Ni3Al) phase. Rather, the subscale formation of Co/Cr-rich phases was observed and a direct transformation of β- into γ-Ni phase after longer times. It is expected that these subscale microstructural changes thus affect the alumina formation and growth as well as the critical aluminum depletion in a different manner as in the case of corresponding β-NiAl coatings, although a direct comparison between various coating systems was not possible on the basis of the present results.
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000858383 7001_ $$0P:(DE-Juel1)129766$$aNaumenko, D.$$b1$$eCorresponding author
000858383 7001_ $$0P:(DE-HGF)0$$aErnsberger, M.$$b2
000858383 7001_ $$0P:(DE-HGF)0$$aHerzog, R.$$b3
000858383 7001_ $$0P:(DE-Juel1)129782$$aQuadakkers, W. J.$$b4
000858383 773__ $$0PERI:(DE-600)2035150-1$$a10.1080/09603409.2017.1392114$$gVol. 35, no. 1-3, p. 66 - 77$$n1-3$$p66 - 77$$tMaterials at high temperatures$$v35$$x1878-6413$$y2018
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