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Recycling process for yttria-stabilized tetragonal zirconia ceramics using a hydrothermal treatment

  • SPECIAL FEATURE: ORIGINAL ARTICLE Selected Papers in the International Symposium on EcoTopia Science (ISETS05): Waste and Emission Management
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Abstract

The recycling process for 3 mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) sintered at 1450°–1550°C was examined by applying low-temperature degradation of zirconia ceramics under hydrothermal conditions. Hydrothermal treatment at a temperature from 200° to 240°C can lead to the spontaneous disintegration of 3Y-TZP sintered bodies into powdery particles. The hydrothermally obtained zirconia powder was found to consist of primary particles and aggregated particles. Detailed X-ray diffraction measurement revealed the formation of a cubic zirconia phase in the 3Y-TZP sintered bodies, which seemed to inhibit the disintegration of aggregated particles toward the primary particle level. The reclaimed 3Y-TZP powder was sintered again through a conventional powder processing route. The mechanical properties and microstructure of recycled 3Y-TZP sintered specimens were examined by comparison with those of the original 3Y-TZP sintered bodies. Dense recycled 3Y-TZP sintered at a higher temperature exhibited higher fracture toughness to some degree than the original 3Y-TZP.

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Authors and Affiliations

  1. EcoTopia Science Institute, Division of Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan

    Masahiro Kamiya, Yasuki Mori, Ryo Sasai & Hideaki Itoh

  2. Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, Chiba, Japan

    Takashi Kojima

Authors
  1. Masahiro Kamiya
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  2. Yasuki Mori
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  3. Takashi Kojima
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  4. Ryo Sasai
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  5. Hideaki Itoh
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Correspondence to Hideaki Itoh.

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Kamiya, M., Mori, Y., Kojima, T. et al. Recycling process for yttria-stabilized tetragonal zirconia ceramics using a hydrothermal treatment. J Mater Cycles Waste Manag 9, 27–33 (2007). https://doi.org/10.1007/s10163-006-0168-3

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  • DOI: https://doi.org/10.1007/s10163-006-0168-3

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