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Effect of additive composition on mechanical properties of pressureless sintered silicon carbide ceramics sintered with alumina, aluminum nitride and yttria

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Abstract

Silicon carbide (SiC) ceramics were pressureless sintered with 3 vol% Al2O3-Y2O3-AlN additives with the AlN/(Al2O3+AlN) molar ratios of 0-0.75 at 1850-2000 °C for 1 hr and the effects of additive composition (i.e., changes in the AlN/(Al2O3+AlN) molar ratio while maintaining constant Y2O3 content) on the mechanical properties of the pressureless-sintered SiC ceramics were investigated. Self-reinforced microstructures consisting of relatively large platelet SiC grains and relatively small equiaxed grains have been obtained in all specimens when sintered at 1900 °C for 1 h in an argon atmosphere. The achievement of self-reinforced microstructures under such mild conditions (holding for 1 hr at 1900 °C) is caused by the beneficial effects of additive composition and the acceleration of the β→α phase transformation of SiC by seeding, i.e., the addition of 1 vol% α-SiC into β-SiC. The typical flexural strength and fracture toughness of the pressureless-sintered SiC ceramics with an AlN/(Al2O3+AlN) mole ratio of 0.5 were 433 MPa and 6.6 MPa·m1/2 at room temperature, respectively.

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Authors and Affiliations

  1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul, 130-743, Republic of Korea

    Jung-Hye Eom, Yu-Kwang Seo & Young-Wook Kim

  2. Materials Development Group, KEPCO Nuclear Fuel, Daejeon, 305-353, Republic of Korea

    Seoung-Jae Lee

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  1. Jung-Hye Eom
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  2. Yu-Kwang Seo
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  3. Young-Wook Kim
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  4. Seoung-Jae Lee
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Correspondence to Young-Wook Kim.

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Eom, JH., Seo, YK., Kim, YW. et al. Effect of additive composition on mechanical properties of pressureless sintered silicon carbide ceramics sintered with alumina, aluminum nitride and yttria. Met. Mater. Int. 21, 525–530 (2015). https://doi.org/10.1007/s12540-015-4383-0

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