US 12,454,490 B2
Sintering method for dental zirconia calcined body
Kazumichi Nonaka, Kyoto (JP); and Shuhei Takahashi, Kyoto (JP)
Assigned to SHOFU INC., Kyoto (JP)
Filed by SHOFU INC., Kyoto (JP)
Filed on May 31, 2022, as Appl. No. 17/828,656.
Claims priority of application No. 2021-091133 (JP), filed on May 31, 2021.
Prior Publication US 2023/0082975 A1, Mar. 16, 2023
Int. Cl. C04B 35/48 (2006.01); C04B 35/64 (2006.01)
CPC C04B 35/48 (2013.01) [C04B 35/64 (2013.01); C04B 2235/3246 (2013.01); C04B 2235/6562 (2013.01)] 16 Claims
 
1. A sintering method for a dental zirconia calcined body containing 5.5 mol % to 7.0 mol % of a stabilizer,
wherein the method satisfies the following (a) to (c),
(a) an average rate of temperature increase in the section from room temperature to 1300° C. is 9° C./min or more,
(b) an average rate of temperature increase in the section from 1300° C. to 1400° C. is 0.6° C./min or more and 3° C./min or less,
(c) an average rate of temperature increase in the section from 1400° C. to the maximum temperature of the sintering process is 0.5° C./min or more and 2.5° C./min or less.