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Characterization of thermal spray coatings by instrumented indentation and scratch testing (part I)

Thermal spray coatings have been used for several decades for enhanced wear, corrosion and thermal protection in various industrial domains. These coatings are routinely used in power plant turbines, aircraft engines, on pulp rolls in the paper industry and in many other applications where their mechanical properties have to be known. This application report presents new methods for testing of mechanical properties of thermal spray coatings by means of instrumented indentation and scratch testing. Namely, the results of low load indentation and scratch tests on HVOF coatings will be presented in this application report.

Introduction

Thermal spray coatings have been used for several decades for enhanced wear, corrosion and thermal protection in various industrial domains. These coatings are routinely used in power plant turbines, aircraft engines, on pulp rolls in the paper industry and in many other applications where extensive wear or high temperature damage occur. The most common deposition methods of thermal spray coatings are plasma spraying (water or gas stabilized), high velocity oxy-fuel (HVOF), wire arc, flame spray and detonation gun.

To achieve the best functionality of the coatings one needs to know the relationships between the mechanisms of coating formation and its mechanical properties. While the mechanisms of formation of such coatings have been rather well investigated, detailed information on mechanical properties still remains difficult to obtain because of the heterogeneity of the coating.

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