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Coatings 2015, 5(3), 278-292; doi:10.3390/coatings5030278

Evaluation of the Shearing Strength of a WC-12Co Thermal Spray Coating by the Scraping Test Method

Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-0051, Japan
Academic Editor: Massimo Innocenti
Received: 4 June 2015 / Revised: 8 July 2015 / Accepted: 10 July 2015 / Published: 15 July 2015
(This article belongs to the Special Issue Trends in Coatings and Surface Technology—Feature Papers)
View Full-Text   |   Download PDF [4998 KB, uploaded 15 July 2015]   |  

Abstract

This paper reports on an experimental and analytical investigation conducted into efficacy of the scraping shear-test method in estimating the shearing adhesive strength of a thermally sprayed coating. It was found that the critical average shear stress, the apparent failure strength of WC-Co thermal spray coating, depends on both the dimensions of the test piece and the loading position around the interface between the coating and the substrate. More specifically, the apparent critical shear stress decreased as the height and width of the test piece increased. In addition, the apparent critical shear stress increased with increasing coating thickness and with decreasing loading point distance measured from the interface. Consequently, the real adhesive strength of thermally sprayed coating could not be ascertained from these experimental results. Furthermore, most of the failure initiation points were inside the coating, as opposed to at the interface. This fact means that the results of the tests do not indicate the interfacial adhesive strength, but rather the shear strength of the coating. Three-dimensional finite element method (FEM) analysis showed that the distributions of the shearing stress at the loading points were virtually the same at failure, regardless of the dimensions of the test piece. These results suggest that the scraping test method needs a corresponding numerical analysis of the failure mode in order to produce reliable results and is not necessarily able to estimate the interfacial adhesive strength of thermally sprayed coating. View Full-Text
Keywords: thermal spray coating; shear strength; scraping shear test; WC-12Co coating; FEM analysis; stress singularity; shear strength criteria thermal spray coating; shear strength; scraping shear test; WC-12Co coating; FEM analysis; stress singularity; shear strength criteria
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kaneko, K. Evaluation of the Shearing Strength of a WC-12Co Thermal Spray Coating by the Scraping Test Method. Coatings 2015, 5, 278-292.

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