Title

Adhesion Properties of Thermal Sprayed Coatings, Deduced from the Interface Indentation Test

Authorship

LESAGE, JACKY; DEMARECAUX, PHILIPPE; CHICOT, DIDIER; MESMACQUE, GERARD

LESAGE, JACKY

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DEMARECAUX, PHILIPPE

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CHICOT, DIDIER

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MESMACQUE, GERARD

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DOI

10.5151/2594-5327-49v9-475-484

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Abstract

One of the most important limitation to the use of coated materials is the adhesion of the coating on its substrate. Among the various methods of measuring or estimating adhesion, the interface indentation test seems to offer interesting prospects. From indentation tests performed at the interface between an hypersonic thermal sprayed chromium carbide coating and several metallic substrates, we show that it is possible to obtain a critical load which may represent adhesion. This critical indentation load is independent of the coating thickness if an appropriate annealing treatment is realized in order to remove the residual stresses appearing during the cooling of the sprayed material. From tests performed on as received specimens, the effect of residual stresses is also discussed.

Keywords

adhesion, thermal spray, indentation test, chromium carbide, residual stress