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P. Fauchais, M. Vardelle, J.F. Coudert, A. Vardelle, C. Delbos, and J. Fazilleau, “Thermal plasma deposition from thick to thin coatings and from micro-to nanostructures” Pure Appl. Chem., Vol.77, No.2, pp.475-485, 2005 Among lectures presented at the 17th Internationa Symposium on Plasma Chemistry (ISPC 17), Toronto, Ontario, Canada, 7-12 August 2005: Toyonobu Yoshida, “Toward a new era of plasma spray processing”, Pure Appl. Chem. Vol.78, No.6, pp.1093-1107, 2006. H. Brachhold, R. Mueller, G. Pross, “Plasma reactions” in Ullmann’s Encyclopedia of Industrial Chemistry, Vol. A20, VCH, Weinheim, 1992.

9.3

High and ultra-high-temperature materials

Aim: to give an overview of families of materials stable at high temperature

Topic description and teaching suggestions: The field of high temperature materials embraces a wide range of metals, alloys, engineering ceramics and composites. Their technological importance for various fields of application is ever increasing. Some are prepared at low temperature but their use is for high temperature applications; others may be prepared only through high temperature processes. After the description of specific high temperature synthesis processes (see previous topic 9.2) it is useful to give students an overview of families of compounds (metallic, oxide and non- oxide ceramics, including refractory pure metals) that are physically and chemically stable at high temperatures (e.g. up to 2000°C and beyond) in inert and in reactive atmospheres (in primis oxidation resistant materials). These materials are important for application-oriented needs in various advanced technologies in aerospace (hypersonic flight, atmospheric re-entry, rocket propulsion, etc.) and advanced energy conversion systems (in particular gas turbines, internal combustion engines, nuclear reactors, solid oxide fuel cell components, etc) and environmental issues. Students should be aware of the physical and chemical properties that allow these materials to be used effectively in extreme environments: melting/transformation temperatures, chemical inertness, thermochemical properties, etc.

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