ZIRCONIA SINTER, PROCESS FOR PRODUCING THE SAME, GRINDING PART MATERIAL, AND ORTHODONTIC BRACKET MATERIAL

Title:

ZIRCONIA SINTER, PROCESS FOR PRODUCING THE SAME, GRINDING PART MATERIAL, AND ORTHODONTIC BRACKET MATERIAL

Document Type and Number:

WIPO Patent Application WO/1995/029141

Kind Code:

A1

Abstract:

A zirconia sinter stabilized by rare earth metal oxide(s) containing a boron compound and having a high fracture toughness and excellent mechanical strength and thermal stability. The sinter mainly comprises ZrO2 and contains at least one rare earth metal oxide (R2O3) selected from among Yb2O3, Er2O3, Ho2O3, Y2O3 and Dy2O3, a boron compound and optionally Al2O3 and/or SiO2. The molar ratio of R2O3 to ZrO2 ranges from 1.3/98.7 to less than 2/98, and the boron content is 0.05-80 mole % in terms of B2O3 (and further the Al2O3 content is 0.1-5 mole % and the SiO2 content is 0.05-1.5 mole %).

Inventors:

NAKAYAMA SUSUMU (JP)
ICHIMORI TERUMITSU (JP)
MINO TADAHIRO (JP)
AYUZAWA NOBUO (JP)

Application Number:

PCT/JP1995/000762

Publication Date:

November 02, 1995

Filing Date:

April 19, 1995

Export Citation:

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Assignee:

SHINAGAWA REFRACTORIES CO (JP)
NAKAYAMA SUSUMU (JP)
ICHIMORI TERUMITSU (JP)
MINO TADAHIRO (JP)
AYUZAWA NOBUO (JP)

International Classes:

A61C7/14; A61C7/28; A61K6/06; B02C17/20; B02C17/22; C04B35/48; C04B35/488; C09K3/14; (IPC1-7): C04B35/486; A61C7/14; B02C17/20

Foreign References:

JPH04280864A	1992-10-06
JPH0221857A	1990-01-24
JPH03237059A	1991-10-22
JPS63252963A	1988-10-20
JPH04349172A	1992-12-03
JPH06239662A	1994-08-30

Other References: