Characterization of Adhesion Strength of HVOF Sprayed IN718 Coatings
Paper in proceeding, 2009

The tensile adhesion strength of thermally sprayed coating is conventionally evaluated via the ASTM C633-69 standard. The maximum measurable adhesion is then limited by the adhesion strength of the polymer media. High velocity oxy-fuel (HVOF) spraying can exhibit very high bonding strength and thus it is essential to develop an alternative method to evaluate coating adhesion strength. In this work a Modified Tensile Adhesion Test (MTAT) is proposed replacing gluing with induction brazing. The method was evaluated for HVOF sprayed Inconel 718 coatings deposited on Inconel 718 substrates. The effect of induction brazing process and the characteristics of the braze-coating interface was given particular interest. The results indicate that the method is superior to the ASTM C633-69 for characterisation of adhesion of coatings with high bond strength.

Tensile Adhesion Test

Bonding Mechanisms


Coating Thickness

ASTM C633-69

Thermal Spraying Process

Inconel 718

Braze Joint Strength.

Induction Brazing

Coating Adhesion Strength


Christophe Lyphout

Chalmers, Materials and Manufacturing Technology

Per Nylén

Uta Klement

Chalmers, Materials and Manufacturing Technology

Mohammad Sattari

Chalmers, Materials and Manufacturing Technology

Proceedings of the 22nd International Conference on Surface Modification Technologies (SMT22), Trollhättan, Sweden

978-0-9817065-1-1 (ISBN)

Subject Categories

Materials Engineering



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