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The Influence of Interface Characteristics on the Adhesion/Cohesion of Plasma Sprayed Tungsten Coatings
Department of Materials Engineering, Institute of Plasma Physics, Za Slovankou 3, 18200 Prague, Czech Republic
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; in revised form: 5 June 2013 / Accepted: 14 June 2013 / Published: 21 June 2013
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.
Keywords: tungsten (W); plasma spraying; physical vapor deposition (PVD); adhesion; cohesion; plasma-facing components; nuclear fusion
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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.
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(2):108-125.
Matějíček, Jiří; Vilémová, Monika; Mušálek, Radek; Sachr, Pavel; Horník, Jakub. 2013. "The Influence of Interface Characteristics on the Adhesion/Cohesion of Plasma Sprayed Tungsten Coatings." Coatings 3, no. 2: 108-125.