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Effect of annealing on mechanical properties of silicon carbide sintered with aluminum nitride and scandium oxide

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Abstract

Beta-SiC powder samples containing 1 wt.% α-SiC as a seed and 10 vol.% AlN-Sc2O3 as a sintering additive were hot-pressed at 1900 °C for 1 h and subsequently annealed at 2000 °C for 1 h, 3 h and 6 h. When the annealing time was increased, the microstructure changed from equiaxed to elongated grains, which resulted in a self-reinforced microstructure consisting of elongated grains (hexagonal platelet grains in 3-dimensions). The development of a self-reinforced microstructure resulted in significant improvement in toughness. However, the improved toughness was offset by a reduction in strength. The typical fracture toughness and strength of the ceramics annealed for 6 h were 7.3 MPa·m1/2 and ∼500 MPa, respectively.

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Authors and Affiliations

  1. Department of Advanced Materials Science and Engineering, Mokpo National University, 61, Dorim-ri, Cheonggye-myeon, Muan-gun, Cheonnam, 534-729, Korea

    Shin-Il Ko & Sang-Jin Lee

  2. Department of Materials Science and Engineering, The University of Seoul, 90, Jeonnong-dong, Dongdaemun-gu, Seoul, 130-743, Korea

    Myong-Hoon Roh, Wonjoong Kim & Young-Wook Kim

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  1. Shin-Il Ko
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  2. Sang-Jin Lee
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  3. Myong-Hoon Roh
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  4. Wonjoong Kim
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  5. Young-Wook Kim
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Correspondence to Young-Wook Kim.

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Ko, SI., Lee, SJ., Roh, MH. et al. Effect of annealing on mechanical properties of silicon carbide sintered with aluminum nitride and scandium oxide. Met. Mater. Int. 15, 149–153 (2009). https://doi.org/10.1007/s12540-009-0149-x

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  • DOI: https://doi.org/10.1007/s12540-009-0149-x

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