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Effects of nondensifying inclusions on the densification and microstructure of zinc oxide matrix composites

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Abstract

The densification and microstructure development of ZnO containing Zn7Sb2O12, ZrO2, and aggregated ZnO were investigated to elucidate the effect of nondensifying inclusions on the sintering of ceramic/ceramic composites. The inclusion retarded the densification, and the degree of retardation was found to depend on the chemical species of inclusion; Zn7Sb2O12 had the largest effect, followed by ZrO2 and then aggregated ZnO last. The experimental results for aggregated ZnO was explained by the theory which predicts the generation of backstresses. The backstresses give a less significant effect on the densification. For Zn7Sb2O12 and ZrO2, the microstructure of the matrix varied with distance from an inclusion particle; much porosity was observed in the region surrounding the inclusion. Circumferential voids, which are responsible for the suppression of densification, form during the initial stage of sintering. Inclusion particles generate an anchoring effect which retards the densification of the matrix immediately surrounding the inclusion particle during the intermediate stage.

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Author notes

  1. Hideto Kajiyama

    Present address: Sony Corp., Atsugi, 243, Kanagawa, Japan

  2. Ryuichi Yazaki

    Present address: Nippon Sanso Corp., Kitakoma-gun, 408, Yamanashi, Japan

Authors and Affiliations

  1. Faculty of Science and Technology, Keio University, 223, Yokohama, Japan

    Toshio Kimura, Hideto Kajiyama, Ryuichi Yazaki & Takashi Yamaguchi

Authors
  1. Toshio Kimura
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  2. Hideto Kajiyama
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  3. Ryuichi Yazaki
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  4. Takashi Yamaguchi
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Supported by the Inamori Foundation.

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Kimura, T., Kajiyama, H., Yazaki, R. et al. Effects of nondensifying inclusions on the densification and microstructure of zinc oxide matrix composites. JOURNAL OF MATERIALS SCIENCE 31, 4149–4157 (1996). https://doi.org/10.1007/BF00352681

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  • DOI: https://doi.org/10.1007/BF00352681

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