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AssigneeTosoh Corporation
InventorsIsao Yamashita, Masayuki Kudou, Koji Tsukuma
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Translucent zirconia sintered bodies have had a problem that incorporation of titania improves translucency but lowers mechanical strength. The invention provides: a zirconia sintered body containing titanium oxide, the sintered body containing 6-15 mol % yttria and 3-20 mol % titania and having an in-line transmission of 50% or higher when examined at a sample thickness of 1 mm and a measuring wavelength of 600 nm; and a zirconia sintered body having especially high translucency which is a high-quality transparent zirconia sintered body that contains 3-20 mol % titania and 6-15 mol % yttria and has an in-line transmission, as measured at a wavelength of 600 nm, of 73% or higher and a haze value of 2.0% or less and that is highly translucent and is undimmed (cloudless). The invention further relates to a production process in which a powder having the composition is molded and thereafter subjected to ordinary-pressure primary sintering and hot isostatic pressing (HIP) under specific conditions.
A zirconia sintered body characterized by containing yttria in an amount of 6-15 mol % and titania in an amount of 3-20 mol % and by having an in-line transmission of 50% or higher when examined at a sample thickness of 1 mm and a measuring wavelength of 600 nm.
A process for producing a zirconia sintered body containing 3-20 mol % titania and 6-15 mol % yttria, characterized by molding a zirconia powder which contains 3-20 mol % titania and 6-15 mol % yttria, subjecting the resultant compact to primary sintering at ordinary pressure and then to hot isostatic pressing (HIP) to obtain a sintered body having a ratio of reduced Ti of 20% or higher, and annealing the sintered body.
Dependencies are inferred from the claim text.