PROBLEM TO BE SOLVED: To provide a zirconia sintered body having high sintered body density and strength and excellent in light-transmitting, and to provide a method of manufacturing the zirconia sintered body with simple process by normal pressure sintering.SOLUTION: A light transmitting zirconia sintered body containing yttria of 2 to 4 mol% as a stabilizer, consisting of zirconia containing alumina of 0.1 to 0.2 wt.% as an additive agent, and having a relative density of 99.8% or more and a light transmittance with thickness of 1.0 mm of 35% or more is obtained by normal pressure sintering. It is preferable to sinter a powder containing alumina having a particle diameter of 0.01 to 0.5 μm of 0.1 to 0.2 wt.%, and having a BET specific surface area of 5 to 15 m2/gm, an average particle size of 0.3 to 0.7 μm, a sinter shrinkage rate during normal sintering (▵ρ/▵T: g/cm3 °C) of 0.0125 to 0.0160 under normal pressure in atmosphere.COPYRIGHT: (C)2014,JPO&INPIT【課題】焼結体密度及び強度が高く、透光感に優れるジルコニア焼結体の製造にはHIP焼結等の特殊な焼結が必要であった。【解決手段】安定化剤として2~4mol%のイットリアを含み、添加剤としてアルミナを0.1~0.2wt%含むジルコニアからなり、相対密度が99.8%以上、かつ厚さ1.0mmでの全光線透過率が35%以上の透光性ジルコニア焼結体を常圧焼結によって得る。粒径が0.01~0.5μmのアルミナを0.1~0.2wt%含みBET比表面積が5~15m2/gm、平均粒径が0.3~0.7μm、常圧焼結における焼結収縮速度(△ρ/△T:g/cm3・℃)が0.0125以上0.0160以下の粉末を大気中の常圧焼結することが好ましい。【選択図】図1
