Zirconia sintered body and manufacturing method of the same

Patent metadata

Field	Value
Publication number	US-10858293-B2
Application number	US-201916369289-A
Country	US
Kind code	B2
Filing date	Mar 29, 2019
Priority date	Mar 30, 2018
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A zirconia sintered body contains aluminum, cobalt, and manganese and a remaining portion consisting of yttria-containing zirconia. In an oxide exchange, aluminum content is 5.0 wt % or more and 30.0 wt % or less, cobalt content is 0.1 wt % or more and 2.0 wt % or less, and manganese content is 0.5 wt % or more and 7.0 wt % or less.

First claim

What is claimed is:

1. A zirconia sintered body comprising aluminum, cobalt, and manganese and a remaining portion consisting of yttria-containing zirconia, wherein, in an oxide exchange, aluminum content is 5.0 wt % or more and 30.0 wt % or less, cobalt content is 0.1 wt % or more and 2.0 wt % or less, and manganese content is 0.5 wt % or more and 7.0 wt % or less.

2. The zirconia sintered body according to claim 1 , wherein yttria content in the yttria-containing zirconia is 2.0 mol % or more and less than 6.0 mol %.

3. The zirconia sintered body according to claim 1 which comprises an aluminum oxide and a composite oxide that contains aluminum, cobalt, and manganese having a spinel structure.

4. The zirconia sintered body according to claim 1 , wherein a lightness L*, a hue a*, and a hue b* in an L*a*b* color system fulfill the following:
Lightness L*: 60 or less
Hue a*: −1.5≤a*≤1.5, and
Hue b*: −2.0≤b*≤2.0.

5. A method of manufacturing the zirconia sintered body according to claim 1 , comprising:
a molding process that molds a powder composition containing, in the oxide exchange, aluminum of 5.0 wt % or more and 30.0 wt % or less, cobalt of 0.1 wt % or more and 2.0 wt % or less, and manganese of 0.5 wt % or more and 7.0 wt % or less, and a remaining portion consisting of yttria-containing zirconia; and
a sintering process that sinters a green body obtained in the molding process at a temperature of 1350° C. or more and 1550° C. or less.

6. A powder composition containing, in the oxide exchange, aluminum of 5.0 wt % or more and 30.0 wt % or less, cobalt of 0.1 wt % or more and 2.0 wt % or less, and manganese of 0.5 wt % or more and 7.0 wt % or less; and a remaining portion consisting of yttria-containing zirconia.

Assignees

• Tosoh Corp

Inventors

• Nagayama Hitoshi
• Funakoshi Hajime
• Fujisaki Hiroyuki

Classifications

• C04B35/4885 Primary

  with aluminium oxide · CPC title

• C04B2235/656

  characterised by specific heating conditions during heat treatment · CPC title

• C04B2235/763

  Spinel structure AB2O4 · CPC title

• C04B2235/77

  Density · CPC title

• C04B2235/963

  Surface properties, e.g. surface roughness · CPC title