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Surface Analysis of Shear Strength Tested Tungsten Carbide Thermal Spray Coatings+

Published online by Cambridge University Press:  02 July 2020

S. V. Naidu ,
Carlos Green ,
Christopher Maxie ,
James D. Garber  and
Gary A. Glass
S. V. Naidu
Affiliation:
Department of Physics, Grambling State University, Grambling, LA71245
Carlos Green
Affiliation:
Department of Physics, Grambling State University, Grambling, LA71245
Christopher Maxie
Affiliation:
Department of Physics, Grambling State University, Grambling, LA71245
James D. Garber
Affiliation:
Department of Chemical Engineering, University of Southwestern Louisiana, Lafayette, LA70504.
Gary A. Glass
Affiliation:
Acadiana Research Laboratory, University of Southwestern Louisiana, Lafayette, LA70504
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Extract

Thermal spray processing has become an important powder-consolidation technique to yield new materials for extremes of temperature, radiation, wear, corrosion and mechanical stresses. High Velocity Oxy-Fuel (HVOF) spray coating process gives higher deposition densities and coating hardness; lower oxide content and porosity. The adhesive strength of thermal spray coatings is greatly effected by the interfacial impurities. The ring shear test method shown in Fig. 1 appears to give the most accurate results on shear adhesive strength. A typical ring shear test result of 88WC12Co 1/4" ring HVOF thermal spray coating on 4140 steel rod using a Jet kote thermal spray gun is shown in Fig. 2. Repeated ring shear tests on similar samples prepared under same spray and test conditions resulted in different shear bond strength and coating ring displacement before break off. We examined the ring shear tested coatings using a Zeiss DMS942 Scanning Electron Microscope (SEM) and Kevex Energy Dispersive X-ray Spectrometer (EDXS) with LPX1 Quantum Si(Li) Detector.

Type
Oxidation, Corrosion, and Protective Coatings
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 791 - 792
Copyright
Copyright © Microscopy Society of America 1997

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References

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