S. Costil, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, China; C. Verdy, M. P. Planche, R. Bolot, C. Coddet, University of Technology Belfort-Montbeliard, Belfort Cedex, France; A. Cornet, M. Bach, INSA Strasbourg, Strasbourg, France
Thermal spraying is a widely used technology in a range of industrial applications to provide coatings improving the surface characteristics. According to the thermal and kinetic specificities of all processes (APS, VPS, flame, electric arc), all materials can also be sprayed. Among materials, ceramic coatings present several interesting aspects as wear resistance, corrosion protection as well as thermal or electrical insulation and particularly alumina coatings which appear as the most commonly used.
Many techniques can be used to spray such kind of materials. From all of them, Atmospheric Plasma Spraying (APS) is a rather well-established process but some other processes can also be used with a lower economical impact as the flame technology.
Then, the aim of this study consists to analyse the alumina coating properties according to the technology employed as atmospheric plasma spraying or wire flame spraying using the Rokide® and the Master Jet® guns. After usual micrographic analyses by SEM, physical and mechanical properties were measured considering the thermal conductivity, the crystallographic structure and the hardness.
Summary: The aim of this study consists to analyse the alumina coating properties according to the technology employed as atmospheric plasma spraying or wire flame spraying using the Rokide® and the Master Jet® guns. After usual micrographic analyses by SEM, physical and mechanical properties were measured considering the thermal conductivity, the crystallographic structure and the hardness.
