|Title||Oxidation resistance of SIC-AlN ceramics coated by oxidation-assisted-pack cementation process|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2011|
|Authors||Magnani, G., Antolini F., Beaulardi L., Brentari A., and Burresi Emiliano|
|Journal||Journal of the European Ceramic Society|
|Keywords||AlN, 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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