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Sintering ofβ-sialon with 5mol% Y2O3-ZrO2 additives

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Abstract

The sintering behaviour ofβ-Sialon composition powders with 5 mol% Y2O3-ZrO2 additives at 1750°C for 1.5 h in nitrogen or argon atmospheres was studied.β-Sialon composition powders could be pressureless-sintered to about 93% theoretical density by the addition of 5 wt% 5 mol% Y2O3-ZrO2. By HIPing the pressureless-sintered bodies the density was increased to higher than 98% theoretical density, and uniform submicrometre ZrO2 particles were homogeneously dispersed in theβ-Sialon matrix, resulting in an increase of fracture toughness,K 1c, from 5.1 to about 5.7 MN m−1.5. Increasing the amount of tetragonal ZrO2 transformable to monoclinic phase in theβ-Sialon matrix increasedK 1c.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Engineering, Nagoya University, Furo-cho, Chikusa-ku, 464, Nagoya, Japan

    Shin-Ichi Hirano, Takashi Hayashi & Takayo Nakashima

Authors
  1. Shin-Ichi Hirano
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  2. Takashi Hayashi
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  3. Takayo Nakashima
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Hirano, SI., Hayashi, T. & Nakashima, T. Sintering ofβ-sialon with 5mol% Y2O3-ZrO2 additives. J Mater Sci 24, 3712–3716 (1989). https://doi.org/10.1007/BF02385761

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  • DOI: https://doi.org/10.1007/BF02385761

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