Disintegration process of yttria-stabilized zirconia ceramics using hydrothermal conditions |
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Authors: | Takashi Kojima Yasuki Mori Masahiro Kamiya Ryo Sasai Hideaki Itoh |
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Affiliation: | (1) EcoTopia Science Institute, Division of Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;(2) Present address: Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan |
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Abstract: | Capability of the recycling of high strength and high fracture toughness yttria-stabilized tetragonal zirconia polycrystalline
(Y-TZP) sintered body utilizing “low-temperature annealing degradation” phenomenon was investigated. Hydrothermal treatment
was employed to induce the phase transformation from tetragonal to monoclinic zirconia and to disintegrate the Y-TZP sintered
body. 3 mol% Y2O3–ZrO2 specimens sintered at 1,550 °C and more were disintegrated without leaving the original appearances when the treatment temperature
was between 200 °C and 400 °C. The size of the disintegrated fragments of Y-TZP sintered body was much affected by hydrothermal
treatment conditions. Only with hydrothermal treatment and simple ball milling, the sintered body was pulverized into the
primary particle level. This technique is expected to apply to a sustainable recycling system for the zirconia ceramics, which
restrains an energy consumption compared to crushing zirconia using mechanical procedures. |
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