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2. 发明申请

US20220267215A1 METHOD FOR PRODUCING ZIRCONIA SINTERED BODY 有权
公开(公告)号：US20220267215A1
公开(公告)日：2022-08-25
申请号：US17631783
申请日：2020-07-31
申请人： KURARAY NORITAKE DENTAL INC.
发明人： Hiroyuki SAKAMOTO , Shinichiro KATO , Atsushi MATSUURA
IPC分类号： C04B35/48 , A61K6/818 , A61C5/70
摘要： The present invention provides a method that is for producing a zirconia sintered body and by which a zirconia molded body or a zirconia pre-sintered body is sintered in a short period of time, the zirconia sintered body reproducing an aesthetic requirement and strength of an ideal dental prosthesis at the same levels as those of a zirconia sintered body obtained by general firing. The present invention relates to a method for producing a zirconia sintered body, comprising a step of firing a zirconia molded body or a zirconia pre-sintered body, wherein: the firing step comprises at least three temperature increase steps including a first temperature increase step (H1), a second temperature increase step (H2), and a third temperature increase step (H3); a temperature increase rate in the first temperature increase step (H1) is defined as HR1, a temperature increase rate in the second temperature increase step (H2) is defined as HR2, and a temperature increase rate in the third temperature increase step (H3) is defined as HR3; HR1=50 to 500° C./min, HR2=11 to 300° C./min, HR3=10 to 299° C./min, HR1>HR2, and HR2/HR3>1 are satisfied; starting temperatures in the temperature increase steps are room temperature to 500° C. in H1, 900 to 1250° C. in H2, and 1300 to 1550° C. in H3; and reaching temperatures in the temperature increase steps are 900 to 1250° C. in H1, 1300 to 1550° C. in H2, and 1400 to 1650° C. in H3.

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