Title:
SINTERED COLORED ALUMINA OF HIGH TOUGHNESS AND HIGH TRANSLUCENCY, AND MANUFACTURING METHOD AND USES THEREFOR
Document Type and Number:
WIPO Patent Application WO/2010/058745
Kind Code:
A1
Abstract:
Because the fracture toughness and translucency of sintered colored transparent alumina of the past were low, the alumina were not suitable for uses such as dental materials, which require high toughness. Provided is a sintered colored translucent alumina that comprises a transition metal oxide, and with which the fracture toughness is greater than 4.5 MPa⋅m0.5 and the maximum value of total light transmittance (1 mm sample thickness) with respect to wavelengths of 300‑800 nm is 60% or more. A sintered alumina comprising a transition metal oxide having a eutectic point with alumina, or a sintered alumina comprising a transitional metal oxide and at least one selected from a group comprising group 1A alkali metal oxides, group 2A alkaline earth metal oxides and SiO2, B2O3, P2O5 and GeO2 is sintered and HIP-treated at normal pressure to obtain a sintered body, at least 20% of which comprises anisotropic particles with a major axis length of 10 µm or greater and an aspect ratio of 1.5 or more.
Inventors:
YAMASHITA ISAO (JP)
TSUKUMA KOJI (JP)
TSUKUMA KOJI (JP)
Application Number:
PCT/JP2009/069393
Publication Date:
May 27, 2010
Filing Date:
November 13, 2009
Export Citation:
Assignee:
TOSOH CORP (JP)
YAMASHITA ISAO (JP)
TSUKUMA KOJI (JP)
YAMASHITA ISAO (JP)
TSUKUMA KOJI (JP)
International Classes:
C04B35/115; A61C7/14; A61C7/28
Foreign References:
| JPS63239154A | 1988-10-05 | |||
| JP2008195581A | 2008-08-28 | |||
| JP2009107887A | 2009-05-21 | |||
| JPH02255563A | 1990-10-16 | |||
| JP2004204912A | 2004-07-22 | |||
| JPH03261648A | 1991-11-21 | |||
| JPS59169979A | 1984-09-26 | |||
| JPS63239154A | 1988-10-05 | |||
| JPH01133973A | 1989-05-26 | |||
| JPH04193760A | 1992-07-13 | |||
| JP2002012471A | 2002-01-15 | |||
| JP2002293613A | 2002-10-09 | |||
| US3026210A | 1962-03-20 | |||
| JPH03261648A | 1991-11-21 | |||
| JPS6487552A | 1989-03-31 | |||
| JPH111365A | 1999-01-06 | |||
| JPH0987008A | 1997-03-31 | |||
| JP2001322866A | 2001-11-20 | |||
| JP2008294498A | 2008-12-04 | |||
| JP2008294499A | 2008-12-04 |
Other References:
YAMASHITA ISAO ET AL.: "Translucent A1203/LaA111018 Composite", J. AM. CERAM. SOC., vol. 92, no. 9, 14 October 2009 (2009-10-14), pages 2136 - 2138, XP008143896
See also references of EP 2366675A4
AMERICAN CERAMIC SOCIETY BULLETIN, vol. 59, 1976, pages 49
See also references of EP 2366675A4
AMERICAN CERAMIC SOCIETY BULLETIN, vol. 59, 1976, pages 49
Attorney, Agent or Firm:
NAITO TERUO (JP)
Teruo Naito (JP)
Teruo Naito (JP)
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