Yttria Partially Stabilized Zirconia Made by High-Speed Centrifugal Compaction Process

Hiroyuki Y. SUZUKI; Yuya NARA; Shunzo TASHIMA; Hidenori KUROKI

doi:10.14852/jcersjsuppl.112.0.S173.0

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue

Session ID : 2

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S173.0

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Host: The Ceramic Society of Japan

Co-host: Iketani Science and Technology Foundation, International Ceramic Federation, Commemorative Organization for the Japan World Exposition '70, The American Ceramic Society, The Australasian Ceramic Society, The Chinese Ceramic Society, The Korean Ceramic Society, Joint Research Consortium of Synergy Ceramics/Fine Ceramics Research Association, Nanotechnology Researchers Network Center of Japan, The Special Coordination Funds for Promoting Science and Technology, Japan National Tourist Organization, Aichi Prefectural Government, CASIO SCIENCE PROMOTION FOUNDATION, DAIKO FOUNDATION, Nagoya Convention and Visitors Bureau, The Asahi Glass Foundation, The Kao Foundation For Arts And Sciences, The Murata Science Foundation, The Ogasawara Foundation for the Promotion of Science & Engineering, ASAHI GLASS CO., LTD. Research Center, CENTRAL GLASS CO., LTD., ELECTRIC GLASS INDUSTRY ASSOCIATION OF JAPAN (EGAJ), Hattori Company, Ltd., Hitachi Research Laboratory, Hitachi, Ltd., HOYA CORPORATION, INAX Corporation, ITOCHU CERATECH CORP., Japan Cement Association, KYOCERA Corporation, KYUSHU REFRACTORIES CO., LTD., MINO CERAMIC CO., LTD., Murata Manufacturing Co., Ltd., NGK INSULATORS LTD., NGK SPARK PLUG CO., LTD., NICHIAS Corporation, NIKKO COMPANY, Nippon Electric Glass Co., Ltd., Nippon Sheet Glass Co., Ltd., NORITAKE CO., LIMITED, Tokuyama Corporation, TOTO LTD.

Papers

Yttria Partially Stabilized Zirconia Made by High-Speed Centrifugal Compaction Process

Hiroyuki Y. SUZUKI, Yuya NARA, Shunzo TASHIMA, Hidenori KUROKI

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Keywords: Centrifugal force, Zirconia slip, Doping by nitrate, TZP, HCP

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Abstract

Tetragonal zirconia polycrystal (TZP) compact was made via colloidal processing by the high-speed centrifugal compaction process (HCP). A pure zirconia powder of 0.14 μm was prepared into aqueous slip and compacted by the HCP under 10,000 g. The compact was presintered, then yttria phase stabilizer was impregnated in the form of an aqueous solution of yttrium nitrate.
The slip with the maximum powder concentration (72.2 mass%) yielded the highest green density of 46% and suppressed the segregation of particles during the HCP. The yttria-doped specimens were densified up to 99% at 1623 K without pressure assistance. The microstructure consisted of grains of 0.5 μm diameter of the tetragonal phase. The highest values of hardness and fracture toughness, Hv 1270 and 9.1 MPa m^1/2, respectively, were obtained with a specimen doped with 2.7 mol% yttria.

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