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000826837 1001_ $$0P:(DE-Juel1)145343$$aHejrani, E.$$b0$$eCorresponding author
000826837 245__ $$aIsothermal and cyclic oxidation behavior of free standing MCrAlY coatings manufactured by high-velocity atmospheric plasma spraying
000826837 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2017
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000826837 520__ $$aIn the present paper the high temperature oxidation behavior of a free standing NiCoCrAlY coating produced by high-velocity atmospheric plasma spraying (HV-APS) is investigated and compared with that produced by conventional low pressure plasma spraying (LPPS). Isothermal thermogravimetric experiments at 1000 and 1100 °C in synthetic air revealed a lower oxidation rate of the HV-APS than the LPPS coating. Both coatings formed oxide scales based on alpha alumina, however, in the LPPS coating incorporation of coarse mixed Y/Al-oxide pegs into the scale occurred, increasing the oxidation rate by providing short circuit paths for oxygen diffusion probably due to higher diffusivities in the mixed oxide and/or along the interfaces between mixed oxide and alumina. In the HV-APS coatings most of the yttrium was tied-up in sub-μm Y-containing oxide particles and only minor amounts of mixed Y/Al oxide precipitates were found in the alumina surface scale. Cyclic air oxidation tests at 1100 °C revealed a lower oxidation rate and better scale adherence for the HV-APS coating.The results thus show that HV-APS is a promising method for the processing of MCrAlY coatings. The specific yttrium distribution in form of fine oxide precipitates in the HV-APS material prevents the formation of deleterious Y-rich oxide pegs and promotes formation of a slowly growing, protective alumina scale with excellent adherence.
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000826837 7001_ $$0P:(DE-Juel1)129662$$aSebold, D.$$b1
000826837 7001_ $$0P:(DE-HGF)0$$aNowak, W. J.$$b2
000826837 7001_ $$0P:(DE-Juel1)129633$$aMauer, G.$$b3
000826837 7001_ $$0P:(DE-Juel1)129766$$aNaumenko, D.$$b4
000826837 7001_ $$0P:(DE-Juel1)129670$$aVassen, Robert$$b5$$ufzj
000826837 7001_ $$0P:(DE-Juel1)129782$$aQuadakkers, W. J.$$b6
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