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Impurity Effects on Shear Adhesive Strength of Tungsten Carbide Thermal Spray Coatings on Steel

Published online by Cambridge University Press:  02 July 2020

Seetala V. Naidu ,
James D. Garber  and
Gary A. Glassc
Seetala V. Naidu
Affiliation:
Department of Physics, Grambling State University, Grambling, LA71245.
James D. Garber
Affiliation:
Department of Chemical Engineering, University of Louisiana at Lafayette, Lafayette, LA70504.
Gary A. Glassc
Affiliation:
Acadiana Research Laboratory, University of Louisiana at Lafayette, Lafayette, LA70504.
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Abstract

We have used High Velocity Oxy-Fuel (HVOF) thermal spray coating process to obtain tungsten carbide coatings on steel. It is important to control the powder quality and surface roughness of the substrate in the thermal spray coating process to obtain good adherence. The adhesive strength is greatly effected by the interfacial impurities. Most commonly used in the thermal spray industry is Al2O3 grit abrasive for good surface roughness of steel substrate to produce anchor patterns for the coating. The previous studies indicated that some fine Al2O3 particles are trapped in the rough surface grooves during this process. The ring shear test method, described previously, appears to give the most accurate results on shear adhesive strength. The ring shear strength test was comprised of a 0.02” thick and 0.25” wide ring coating on a 1” diameter cylindrical substrate rod. This rod is placed in a disk with a cylindrical hole of the rod size and an incremental pressure is applied on the rod.

Type
Applications of Microscopy: Surfaces/Interfaces
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 328 - 329
Copyright
Copyright © Microscopy Society of America 2001

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