Pressureless sintering and mechanical properties of alumina-sialon composites

Abstract

Compositions of Al2O3, Si3N4 and AlN were sintered to produce six different alumina-sialon composites. The composites reached the highest density at 1700 °C in a nitrogen atmosphere. Sialon acted as a binder, promoting the densification and suppressing the grain growth of alumina. The composites had a bending strength of 450 MPa at room temperature and maintained high strength over 300 MPa at 1400 °C. The composite with 30 wt % sialon had the maximum fracture toughness of 4.3 MPa·m1/2 and exhibited good oxidation resistance even at 1400 °C. Mullite was formed in the oxidation layer and little degradation in strength was observed after oxidation.

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References

  1. 1.

    G. Das, M. G. Mendiratt and G. R. Cornish, J. Mater. Sci. 17 (1982) 2486.

    CAS  Article  Google Scholar 

  2. 2.

    K. Takatori and O. Kamigaito, J. Mater. Sci. Lett. 7 (1988) 1024.

    CAS  Article  Google Scholar 

  3. 3.

    K. Takatori, H. Doi and O. Kamigaito, J. Mater. Sci. 3 (1984) 987.

    CAS  Google Scholar 

  4. 4.

    Japanese Industrial Standards Committee, Testing Method for Flexural Strength of High Performance Ceramics, JIS R 1601.

  5. 5.

    K. Niihara, R. Morena and D. P. H. Hasselman, J. Mater. Sci. Lett. 1 (1982) 13.

    CAS  Article  Google Scholar 

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Takatori, K. Pressureless sintering and mechanical properties of alumina-sialon composites. J Mater Sci 26, 4484–4490 (1991). https://doi.org/10.1007/BF00543671

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Keywords

  • Oxidation
  • Nitrogen
  • Polymer
  • Alumina
  • Atmosphere