US 12,465,560 B2
Process for producing a dental zirconia article with a fast sintering process
Holger Hauptmann, Sindelsdorf (DE); Martin Goetzinger, Pflugdorf (DE); and Sybille A. Schmittner, Inning (DE)
Assigned to Solventum Intellectual Properties Company, Maplewood, MN (US)
Appl. No. 16/975,193
Filed by Solventum Intellectual Properties Company, Maplewood, MN (US)
PCT Filed Feb. 25, 2019, PCT No. PCT/IB2019/051511
§ 371(c)(1), (2) Date Aug. 24, 2020,
PCT Pub. No. WO2019/166938, PCT Pub. Date Sep. 6, 2019.
Claims priority of application No. 18159101 (EP), filed on Feb. 28, 2018.
Prior Publication US 2021/0093517 A1, Apr. 1, 2021
Int. Cl. A61K 6/818 (2020.01); A61C 13/00 (2006.01); A61C 13/083 (2006.01); B28B 11/24 (2006.01); C04B 35/64 (2006.01)
CPC A61K 6/818 (2020.01) [A61C 13/0022 (2013.01); A61C 13/083 (2013.01); B28B 11/243 (2013.01); C04B 35/64 (2013.01); C04B 2235/6562 (2013.01); C04B 2235/6567 (2013.01); C04B 2235/661 (2013.01); C04B 2235/668 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process of sintering a porous dental zirconia article, the process comprising:
providing the porous dental zirconia article,
the porous dental zirconia article having been subjected to a pre-sintering heat treatment at a temperature of 960° C. to 980° C.,
the porous dental zirconia article characterized by a BET surface of 5 to 12 m2/g and being composed of a zirconia material containing about 4 mol % yttria and no greater than 0.15 wt. % alumina;
subjecting the porous dental zirconia article to:
a first segment of heat-treating, the first segment of heat-treating involving a heating rate of at least 3 K/sec until a temperature of 1,125° C. to 1,485° C. is achieved, and
a second segment of heat-treating, the second segment of heat-treating involving a heating rate of 2.5 K/sec until a final sintering temperature of 1,500° C. to 1650° C. is reached, to obtain a partially sintered dental zirconia article.