@prefix prodottidellaricerca: . @prefix istituto: . @prefix prodotto: . istituto:CDS073 prodottidellaricerca:prodotto prodotto:ID43305 . @prefix pubblicazioni: . @prefix unitaDiPersonaleInterno: . unitaDiPersonaleInterno:MATRICOLA2925 pubblicazioni:autoreCNRDi prodotto:ID43305 . unitaDiPersonaleInterno:MATRICOLA10408 pubblicazioni:autoreCNRDi prodotto:ID43305 . @prefix rdf: . @prefix retescientifica: . prodotto:ID43305 rdf:type retescientifica:ProdottoDellaRicerca , prodotto:TIPO1101 . @prefix rdfs: . prodotto:ID43305 rdfs:label "Influence of additives content on the high temperature oxidation of silicon nitride based composites (Articolo in rivista)"@en . @prefix xsd: . prodotto:ID43305 pubblicazioni:anno "2003-01-01T00:00:00+01:00"^^xsd:gYear ; pubblicazioni:doi "10.1016/S0955-2219(02)00376-X"^^xsd:string . @prefix skos: . prodotto:ID43305 skos:altLabel "
Klein R., Medri V., Desmaison Brut M., Bellosi A., Desmaison J. (2003)
Influence of additives content on the high temperature oxidation of silicon nitride based composites
in Journal of the European Ceramic Society
"^^rdf:HTML ; pubblicazioni:autori "Klein R., Medri V., Desmaison Brut M., Bellosi A., Desmaison J."^^xsd:string ; pubblicazioni:paginaInizio "603"^^xsd:string ; pubblicazioni:paginaFine "661"^^xsd:string ; pubblicazioni:numeroVolume "23"^^xsd:string . @prefix ns10: . prodotto:ID43305 pubblicazioni:rivista ns10:ID506931 ; skos:note "ISI Web of Science (WOS)"^^xsd:string ; pubblicazioni:affiliazioni "SPCTS, CNRS, Univ. of Limoges, 123 Av. A. Thomas, Limoges 87060, France\nCNR-IRTEC, National Research Council, Res. Institute/Ceramic Tech., Via Granarolo 64, Faenza 48018, Italy"^^xsd:string ; pubblicazioni:titolo "Influence of additives content on the high temperature oxidation of silicon nitride based composites"^^xsd:string ; prodottidellaricerca:abstract "A life prediction tool for mechanical and electrical applications of electroconductive structural ceramics is essential in order to know the limit for engineering uses. The aim of this work was to study the influence of additives content on the oxidation behaviour, in pure oxygen between 900 to 1400\u00B0C, of two fully dense Si3N4-35 vol%TiN composites. For this purpose, a hot pressed material (HP), containing 3.7 wt.% of Y2O3 and Al2O3 as sintering aids, was compared to an hipped material (HIP), containing 0.4 wt % of the same additives. Up to a temperature T<~1200\u00B0C, where the oxidation of the composite is mainly governed by the preferential oxidation of TiN, the two materials exhibit paralinear kinetics with very close oxidation resistance. Contrarily, the hipped material shows a better oxidation resistance at T>~1200\u00B0C, when the oxidation of the Si3N4 matrix takes place. The formation of a compact silica sub-scale acts as an efficient diffusion barrier leading to asymptotic kinetics, with final weight gains exhibiting a negative temperature dependence. In the case of the HP material, i.e. in presence of a higher content of additives, a deterioration of the protective nature of the scale is provoked by the increased mobility of the impurity cations (Y3+, Al3+) linked to a decrease of the viscosity of the secondary glassy phase. The kinetics have a paralinear shape up to 1400\u00B0C, with final weight gains increasing as a function of temperature. Therefore, this study confirms the deleterious influence on oxidation resistance of additives used for a better sintering of powders and the beneficial effect of hot isostatic pressing for which lower amounts of aids are necessary that in the case of hot pressing."@en ; prodottidellaricerca:prodottoDi istituto:CDS073 ; pubblicazioni:autoreCNR unitaDiPersonaleInterno:MATRICOLA10408 , unitaDiPersonaleInterno:MATRICOLA2925 . @prefix parolechiave: . prodotto:ID43305 parolechiave:insiemeDiParoleChiave . ns10:ID506931 pubblicazioni:rivistaDi prodotto:ID43305 . parolechiave:insiemeDiParoleChiaveDi prodotto:ID43305 .