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Effects of oxidation on the mechanical properties of pressureless-sintered SiC-AlN-Y2O3 composites obtained without powder bed

TitleEffects of oxidation on the mechanical properties of pressureless-sintered SiC-AlN-Y2O3 composites obtained without powder bed
Publication TypePresentazione a Congresso
Year of Publication2009
AuthorsMagnani, G., Beaulardi L., and Trentini E.
Conference NameCeramic Engineering and Science Proceedings
Conference LocationDaytona Beach, FL
ISBN Number9780470344934
KeywordsAlN, Before and after, Beneficial effects, Ceramic materials, Compressive residual stress, Corrosion, Corrosion fatigue, Cost-effective methods, Crack-healing abilities, Critical temperature differences, Flexural strengths, Fracture toughness, Mechanical properties, Mechanical resistances, oxidation, Oxidative treatments, Powder beds, Pre oxidations, Pressureless-sintered, Reliability, Residual stresses, Silicon carbide, Sintering, Strength of materials, Thermal shock resistances, Weibull distribution, Weibull modulus, Yttrium alloys
Abstract

Mechanical properties of SiC-AlN-Y2O3 composites (SiC 50%wt-AlN 50%wt), pressureless-sintered with an innovative and cost-effective method, were determined before and after oxidation performed at 1300°C for 1h. As a consequence of the oxidative treatment, fracture toughness increased from 4.6 MPa m1/2 to 6.6 MPa m1/2, flexural strength from 420 MPa to 488 MPa, Weibull modulus from 4.5 to 5.3 and thermal shock resistance (expressed as critical temperature difference) from 310°C to 380°C. First of all, these results demonstrated that a pre-oxidation treatment is needed to increase the mechanical resistance and reliability of SiC-AlN-Y 2O3 components. Secondarily, the beneficial effects of the oxidation on the mechanical properties could be explained in terms of compressive residual stresses and crack healing ability.

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-62849114231&partnerID=40&md5=c86a203b47300dc126817465033f59ed
Citation KeyMagnani200957