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Coatings 2013, 3(2), 108-125; doi:10.3390/coatings3020108

The Influence of Interface Characteristics on the Adhesion/Cohesion of Plasma Sprayed Tungsten Coatings

1
Department of Materials Engineering, Institute of Plasma Physics, Za Slovankou 3, 18200 Prague, Czech Republic
2
Faculty of Mechanical Engineering, Czech Technical University in Prague, Karlovo náměstí 13, 12135 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Received: 3 May 2013 / Revised: 5 June 2013 / Accepted: 14 June 2013 / Published: 21 June 2013
(This article belongs to the Special Issue High Temperature Coatings)
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Abstract

Tungsten is the prime candidate material for plasma facing components of future fusion devices. Plasma spraying, with its ability to coat large areas, including non-planar surfaces, with a significant thickness, is a prospective fabrication technology for components subject to moderate heat loads, e.g., the first wall of the Demonstration Reactor (DEMO). The functionality of such coatings is critically dependent on their adhesion to the underlying material. This in turn, is influenced by a variety of processing-related factors, chief among them being the state of the interface. In this study, the effects of two factors—surface roughness and the presence of thin interlayers—were investigated. Two different levels of roughness of steel substrates were induced by grit blasting, and two thin interlayers—titanium (Ti) and tungsten (W)—were applied by physical vapor deposition prior to plasma spraying of W by a Water Stabilized Plasma (WSP) torch. Coating adhesion was determined by a shear adhesion test. The structures of the coatings and the interfaces, as well as the characteristics of the fractured surfaces, were observed by SEM. View Full-Text
Keywords: tungsten (W); plasma spraying; physical vapor deposition (PVD); adhesion; cohesion; plasma-facing components; nuclear fusion tungsten (W); plasma spraying; physical vapor deposition (PVD); adhesion; cohesion; plasma-facing components; nuclear fusion
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Matějíček, J.; Vilémová, M.; Mušálek, R.; Sachr, P.; Horník, J. The Influence of Interface Characteristics on the Adhesion/Cohesion of Plasma Sprayed Tungsten Coatings. Coatings 2013, 3, 108-125.

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