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| 001 | 826837 | ||
| 005 | 20240711092258.0 | ||
| 024 | 7 | _ | |a 10.1016/j.surfcoat.2017.01.081 |2 doi |
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| 082 | _ | _ | |a 620 |
| 100 | 1 | _ | |a Hejrani, E. |0 P:(DE-Juel1)145343 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Isothermal and cyclic oxidation behavior of free standing MCrAlY coatings manufactured by high-velocity atmospheric plasma spraying |
| 260 | _ | _ | |a Amsterdam [u.a.] |c 2017 |b Elsevier Science |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a In 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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| 700 | 1 | _ | |a Mauer, G. |0 P:(DE-Juel1)129633 |b 3 |
| 700 | 1 | _ | |a Naumenko, D. |0 P:(DE-Juel1)129766 |b 4 |
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| 700 | 1 | _ | |a Quadakkers, W. J. |0 P:(DE-Juel1)129782 |b 6 |
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