Patent ID: 11945727
Assignee: DAIICHI KIGENSO KAGAKU KOGYO CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC C

Claim 10:
11. The zirconia-based porous body according to claim 1, wherein when a specific surface area after a heat treatment at 1100° C. for 3 hours is taken as A, and a specific surface area after 100 g of the zirconia-based porous body is dispersed in 250 g of ion-exchanged water, and a pH of the dispersed product is adjusted to 4.0 with nitric acid, followed by wet-pulverizing under the following wet pulverization conditions until a particle size D50 becomes 1 μm or less, drying, and performing a heat treatment at 1100° C. for 3 hours is taken as B, a specific surface area maintenance rate represented by the following formula 1 is 80% or more:
<wet pulverization conditions>
pulverizer: planetary ball mill
ZrO2 pot: 500 cc
ZrO2 beads (φ 2 mm): 900 g
number of rotations: 400 rpm

(specific surface area maintenance rate)=[(specific surface area B)/(specific surface area A)]×100(%)  <Formula 1>.