The influences of heat treatments and interdiffusion on the adhesion of plasma-sprayed NiCrAlY coatings

• Published in: Surface & coatings technology Vol. 82; no. 1; pp. 99 - 109
• Main Authors: Richard, C.S., Béranger, G., Lu, J., Flavenot, J.F.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-07-1996; Elsevier
• Subjects: Adhesion; Applied sciences; Exact sciences and technology; Heat treatment; Interdiffusion; Metallic coatings; Metals. Metallurgy; Plasma-sprayed coating; Production techniques; Residual stresses; Surface treatment; Interdiffusion; Heat treatment; Residual stresses; Plasma-sprayed coating; Adhesion; Nickel base alloys; Aluminium alloy; Aeronautic industry; Surface treatment; Superalloy; Metal coating; Chromium alloy; Cobalt alloy; Microstructure; Plasma spraying; Application; Residual stress; Interface
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/0257-8972(95)02640-1

Most coatings are applied with a specific aim in mind, such as improving the base material resistance to corrosion or wear, or providing a barrier against high temperatures. These aims can obviously only be achieved if the coating is properly bonded to the substrate. This study is focused on a NiCrAlY metallic bonding layer and its adhesion on to nickel-based superalloy substrate. It also looks at the influence of different spraying methods (atmospheric plasma spraying and vacuum plasma spraying) and the influence of a post-heat treatment on adhesion of the coatings. In order to determine adherence, a Vickers indentation test was performed at the substrate/coating interface. In each case, the residual stresses were evaluated by a step-by-step hole drilling method and these were taken into account in assessing the adhesion parameters. The results were supplemented by a microstructural study of the interface.