CoNiCrAlY coatings were produced by means of the vacuum plasma spraying (VPS) process onto CMSX-4 single crystal nickel superalloy disk substrates. As-sprayed samples were annealed at high temperatures in low vacuum. Three kinds of finishing processes were carried out, producing three types of samples: as-sprayed, mechanically smoothed by grinding, ground and PVD coated by using aluminum targets in an oxygen atmosphere. Samples were tested under isothermal conditions, in air, at 1000 degrees C, and up to 5000 h. Morphological, microstructural and compositional analyses were performed on the coated samples in order to assess the high temperature oxidation behavior provided by the three different surface finishing processes. Several differences were observed: grinding operations decrease the oxidation resistance, whereas the PVD process can increase the performances over longer time with respect of the as-sprayed samples.

Influence of Surface Finishing on the Oxidation Behaviour of VPS MCrAlY Coatings / A. Fossati; M. Di Ferdinando; U. Bardi; A. Scrivani; C. Giolli. - In: JOURNAL OF THERMAL SPRAY TECHNOLOGY. - ISSN 1059-9630. - STAMPA. - 21:(2012), pp. 314-324. [10.1007/s11666-011-9705-2]

Influence of Surface Finishing on the Oxidation Behaviour of VPS MCrAlY Coatings

DI FERDINANDO, MARTINA;BARDI, UGO;GIOLLI, CARLO
2012

Abstract

CoNiCrAlY coatings were produced by means of the vacuum plasma spraying (VPS) process onto CMSX-4 single crystal nickel superalloy disk substrates. As-sprayed samples were annealed at high temperatures in low vacuum. Three kinds of finishing processes were carried out, producing three types of samples: as-sprayed, mechanically smoothed by grinding, ground and PVD coated by using aluminum targets in an oxygen atmosphere. Samples were tested under isothermal conditions, in air, at 1000 degrees C, and up to 5000 h. Morphological, microstructural and compositional analyses were performed on the coated samples in order to assess the high temperature oxidation behavior provided by the three different surface finishing processes. Several differences were observed: grinding operations decrease the oxidation resistance, whereas the PVD process can increase the performances over longer time with respect of the as-sprayed samples.
2012
21
314
324
A. Fossati; M. Di Ferdinando; U. Bardi; A. Scrivani; C. Giolli
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/776622
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