Obiettivo The nonoxide technical ceramics of the silicon carbide and silicon nitride groups have been developed specifically for a number of high temperature applications, of which gas turbine engine components and heat exchangers provide 2 well studied examples. In these and similar applications the materials are exposed to substances, already well known in the metallurgical area, likely to cause accelerated oxidation through interaction with protective oxide films. 2 examples are sodium sulphate and vanadium pentoxide. For this reason considerable effort has been put into studying silicon nitride based materials in oxidising environments at high temperature in the presence of fluxing metal salts and oxides. Chemical stability is determined by 2 sets of factors, the thermodynamic and the kinetic, which must be examined separately.Specific aspects in the present context are : the thermodynamic stability at high temperature of a system prepared by equilibration under conditions of low oxygen potential but now exposed to a high oxygen potential; the rate at which a new state of equilibrium can be attained, initially at least at the surface of the material. Because of the importance of silicon dioxide, as the primary oxidation product for the corrosion process, this material is examined first. Campo scientifico natural scienceschemical scienceselectrochemistryelectrolysisnatural scienceschemical sciencesinorganic chemistrytransition metalsnatural sciencesphysical sciencesthermodynamicsnatural scienceschemical sciencesinorganic chemistrymetalloidsengineering and technologymaterials engineeringceramics Programma(i) FP1-STIMULATION 1C - Plan (EEC) to stimulate European scientific and technical cooperation and interchange, 1985-1988 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore UNIVERSITY OF LEEDS Contributo UE Nessun dato Indirizzo Woodhouse Lane LS2 9JT LEEDS Regno Unito Mostra sulla mappa Costo totale Nessun dato Partecipanti (2) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto BELGIAN NUCLEAR RESEARCH CENTRE Belgio Contributo UE Nessun dato Indirizzo 200,Herrmann Debrouxlaan 40-42 1160 BRUXELLES Mostra sulla mappa Costo totale Nessun dato Université de Limoges Francia Contributo UE Nessun dato Indirizzo 13 rue de Genève 87065 Limoges Mostra sulla mappa Costo totale Nessun dato
