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    • 45. 发明公开
    • METHOD FOR PRODUCING ZIRCONIA SINTERED BODY
    • US20230382808A1
    • 2023-11-30
    • US18027680
    • 2021-09-24
    • Kuraray Noritake Dental Inc.
    • Atsushi MATSUURA
    • C04B35/48A61K6/818
    • C04B35/48A61K6/818C04B2235/3225C04B2235/6562C04B2235/6567
    • The present invention provides a method of production of a zirconia sintered body by which a zirconia molded body or zirconia pre-sintered body having a plurality of layers containing different amounts of stabilizer is sintered in a short time period to produce a zirconia sintered body having hardly noticeable stripes between layers differing in yttria content. The present invention relates to a method for producing a zirconia sintered body, comprising a firing step of firing a zirconia molded body or a zirconia pre-sintered body,



      the zirconia molded body or the zirconia pre-sintered body comprising a plurality of layers containing a stabilizer,
      the plurality of layers including layers having different stabilizer contents,
      the firing step comprising at least three stages of temperature-increasing process including a first temperature-increasing step (H1), a second temperature-increasing step (H2), and a third temperature-increasing step (H3),
      the method satisfying HR2=more than 0° C./min and less than 50° C./min, HR3=5 to 150° C./min, and HR3/HR2>1, where HR2 is a rate of temperature increase in H2, and HR3 is a rate of temperature increase in H3,
      the temperature-increasing process having start temperatures that are 1,000° C. or less in H1, more than 1,250° C. and 1,450° C. or less in H2, and 1,450° C. or more and 1,550° C. or less in H3,
      the temperature-increasing process having end temperatures that are more than 1,250° C. and 1,450° C. or less in H1, 1,450° C. or more and 1,550° C. or less in H2, and 1,500° C. or more and 1,750° C. or less in H3.