Title:
ZIRCONIA GRANULES, GREEN COMPACT, AND METHODS RESPECTIVELY FOR PRODUCING THOSE PRODUCTS
Document Type and Number:
WIPO Patent Application WO/2022/138760
Kind Code:
A1
Abstract:
The present invention provides: granules suitable for the production of a zirconia sintered body having high light transmittance and high strength and the production of a highly dense and uniform calcined body; a green compact; and methods respectively for producing the granules and the green compact. The present invention relates to granules which comprise zirconia, a stabilizing agent capable of inhibiting the phase transition of zirconia, and a binder, and have a compression ratio R calculated in accordance with formula (1) of 0.46 to 0.53 when the granules are filled in a columnar mold by tapping in accordance with JIS R 1628:1997, are then compressed by uniaxial pressing at a speed of 1 mm/sec, and are then pressurized to 33 MPa. R = (H-D)/H (1) (wherein H represents a height of the granules filled by tapping in the columnar mold before the pressurization; and D represents a strain amount required until the pressure reaches 33 MPa.)
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Inventors:
NAKANO KIRIHIRO (JP)
KASHIKI NOBUSUKE (JP)
KUDO YASUTAKA (JP)
ITO YOSHIHISA (JP)
KASHIKI NOBUSUKE (JP)
KUDO YASUTAKA (JP)
ITO YOSHIHISA (JP)
Application Number:
PCT/JP2021/047686
Publication Date:
June 30, 2022
Filing Date:
December 22, 2021
Export Citation:
Assignee:
KURARAY NORITAKE DENTAL INC (JP)
International Classes:
C01G25/02; A61C5/70; A61C13/083; C04B35/486; C04B35/626; C04B35/634
Domestic Patent References:
| WO2018056331A1 | 2018-03-29 |
Foreign References:
| JP2012500770A | 2012-01-12 | |||
| JP2003342059A | 2003-12-03 | |||
| JP2006027914A | 2006-02-02 | |||
| JPH0692714A | 1994-04-05 | |||
| JP2019212582A | 2019-12-12 | |||
| JP2015143178A | 2015-08-06 | |||
| JP2006027914A | 2006-02-02 |
Other References:
TSUBAKI, JUNICHIRO; MORI, TAKAMASA; KONISHI, TOSHIYUKI; TSURUTA, AKIHISA; MORI, HIDETOSHI; YOKOYAMA, TOYOKAZU; MATSUBARA, SADANOBU: "Mechanical Characterization of Spray-Dried Granules by Compression Stress-Relaxation Technique -Analysis of Compression Behavior-", JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, vol. 107, no. 11, 1 November 1999 (1999-11-01), JP , pages 1093 - 1098, XP009537812, ISSN: 0914-5400, DOI: 10.2109/jcersj.107.1093
DURMUS CAGATAY, OZGEN OMER SERDAR: "Experimental synthesis of granulated zirconia powders by spray dryer", MATERIALS LETTERS, ELSEVIER, AMSTERDAM, NL, vol. 145, 1 April 2015 (2015-04-01), AMSTERDAM, NL , pages 243 - 246, XP055945896, ISSN: 0167-577X, DOI: 10.1016/j.matlet.2015.01.121
JUNICHIRO TSUBAKI ET AL.: "Mechanical Characterization of Spray-Dried Granules by Compression and Stress-Relaxation Technique", JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, vol. 107, no. 12, 1999, pages 1183 - 1187
JUNICHIRO TSUBAKI ET AL.: "Roles of Chemical Engineering in Ceramic Industry", CHEMICAL ENGINEERING, vol. 48, no. 1, 2003, pages 34 - 38
DURMUS CAGATAY, OZGEN OMER SERDAR: "Experimental synthesis of granulated zirconia powders by spray dryer", MATERIALS LETTERS, ELSEVIER, AMSTERDAM, NL, vol. 145, 1 April 2015 (2015-04-01), AMSTERDAM, NL , pages 243 - 246, XP055945896, ISSN: 0167-577X, DOI: 10.1016/j.matlet.2015.01.121
JUNICHIRO TSUBAKI ET AL.: "Mechanical Characterization of Spray-Dried Granules by Compression and Stress-Relaxation Technique", JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, vol. 107, no. 12, 1999, pages 1183 - 1187
JUNICHIRO TSUBAKI ET AL.: "Roles of Chemical Engineering in Ceramic Industry", CHEMICAL ENGINEERING, vol. 48, no. 1, 2003, pages 34 - 38
Attorney, Agent or Firm:
KAMADA Koichi et al. (JP)
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