Abstract
A technique for determining the adhesion of a thermal spray coating was developed by modifying procedures commonly used to test adhesion by peeling. A coating is deposited on a metal foil that has been soldered to a massive copper block, which provides mechanical support and serves as a heat sink. Then the block, foil, and coating are glued to a stiff aluminum plate, after which the copper block is removed. The foil is peeled from the coating according to a procedure similar to the ASTM D 3167 peel test. This method causes a crack to propagate precisely along the coating/substrate interface in a stable fashion, with the movement of the crack tip controlled by the peeling speed. Sample preparation, test procedures, and in-itial results are discussed. The technique has been applied to testing the local variations in adhesion for plasma-sprayed Cr2O3 and a Ni-Mo-Al composite on a stainless steel foil. Based on these results, testing procedures are recommended and a peel test jig is specified.
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