Oxidation resistance of SIC-AlN ceramics coated by oxidation-assisted-pack cementation process

TitleOxidation resistance of SIC-AlN ceramics coated by oxidation-assisted-pack cementation process
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2011
AuthorsMagnani, G., Antolini F., Beaulardi L., Brentari A., and Burresi Emiliano
JournalJournal of the European Ceramic Society
KeywordsAlN, AlN ceramic, Cementing (shafts), Cements, Ceramic materials, Coated sample, D. SiC, Density (specific gravity), Erbium, Holmium, Liquid Phase, oxidation, Oxidation products, Oxidation resistance, Pack cementation, Pack cementation process, Pressureless-sintered, Rare-earth oxide, Reactive powder, Scandium, Silicates, Silicon carbide, Sintering, Specific weights

Liquid-phase-pressureless-sintered SiC-AlN-Y2O3 composites were coated by means of modified pack cementation process (OXPAC, OXidation-assisted-PAck Cementation) using rare-earth oxides, RE2O3 (RE=Sc, Er, Sm, Lu, Ho), as reactive powders. The coatings, composed by the oxidation products of SiC, AlN and rare-earth silicates, were adherent to the substrate, without porosity and with a thickness of 10μm. The oxidation resistance of the coated SiC-AlN-Y2O3 ceramics was also investigated at 1500°C for a period of 200h. The coated samples showed specific weight gain lower than the uncoated and pre-oxidised samples. Furthermore, the specific weight gain linearly increased with the rare-earth cationic radius. © 2010 Elsevier Ltd.


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