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Effect of processing conditions on the characteristics of pores in hot isostatically pressed alumina

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Abstract

Effect of processing conditions on the characteristics of residual pores was studied with an optical microscope in hot isostatically pressed translucent alumina ceramics. Green bodies formed by isostatic pressing were sintered at 1300, 1400 and 1600°C and then hot isostatically pressed at a temperature 50°C below the respective sintering temperature for 1 h at 100 MPa. All specimens were fully dense within experimental accuracy (±0.1%), and the grain size increased with increasing sintering/hot isostatic pressing temperatures. A variety of pores were found in all specimens. The distribution of pores was uniform at various locations within the specimen. The pore population decreased with increasing pore size, but was finite in the size range exceeding 84 μm. The pores in this range increased with increasing sintering/hot isostatic pressing temperature. Except for these large pores, the pore population was similar under all processing conditions.

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Authors and Affiliations

  1. Department of Chemistry, Nagaoka University of Technology, Kamitomioka, Nagaoka, Niigata, Japan

    K. Uematsu, M. Sekiguchi, J. -Y. Kim & K. Saito

  2. Advanced Technology Research Centre, Nippon Kokan Ltd, Minamiwataridacho 1-1, Kawasakiku, 210, Kawasaki, Japan

    A. Miyamoto

  3. Department of Mechanical Engineering, Nagaoka University of Technology, Kamitomioka, Nagaoka, Niigata, Japan

    Y. Mutoh & M. Inoue

  4. Department of Planning and Management, Nagaoka University of Technology, Kamitomioka, Nagaoka, Niigata, Japan

    Y. Fujino

Authors
  1. K. Uematsu
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  2. M. Sekiguchi
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  3. J. -Y. Kim
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  4. K. Saito
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  5. Y. Mutoh
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  6. M. Inoue
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  7. Y. Fujino
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  8. A. Miyamoto
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Uematsu, K., Sekiguchi, M., Kim, J.Y. et al. Effect of processing conditions on the characteristics of pores in hot isostatically pressed alumina. J Mater Sci 28, 1788–1792 (1993). https://doi.org/10.1007/BF00595746

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  • DOI: https://doi.org/10.1007/BF00595746

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