Zirconia sintered body and method for manufacturing the same
Provided are a zirconia sintered body capable of being widely used as a dental material, in particular, a zirconia sintered body capable of being applied to both a dental material for a back tooth and a dental material for a front tooth and a simple and easy method for manufacturing the zirconia sintered body. The method for manufacturing a zirconia sintered body includes a molding step of molding a powder composition that has an yttria content of more than 3% by mole and 5.2% by mole or less and that contains a first zirconia powder having an yttria content of 2% by mole or more and 4% by mole or less and a second zirconia powder having an yttria content of more than 4% by mole and 6% by mole or less to obtain a green body, and a sintering step of sintering the green body to obtain a sintered body.
1. A zirconia sintered body having a yttria content of more than 3% by mole and 5.2% by mole or less and a yttrium concentration distribution in which a maximum of a frequency is 7.5% or less, the yttrium concentration distribution being obtained by a quantitative analysis of elements of an energy dispersive X-ray spectrum.
2. The zirconia sintered body according to claim 1 , wherein a crystal phase of the zirconia sintered body comprises a tetragonal phase including a T phase and a T* phase.
3. The zirconia sintered body according to claim 1 , wherein the zirconia sintered body has an average crystal grain size of more than 0.41 μm and 1.5 μm or less.