| CPC A61C 13/0022 (2013.01) [A61C 13/082 (2013.01); A61C 13/083 (2013.01); A61C 13/09 (2013.01); B32B 18/00 (2013.01); C04B 35/48 (2013.01); C04B 35/486 (2013.01); C04B 35/488 (2013.01); C04B 35/4885 (2013.01); C04B 35/64 (2013.01); C04B 2235/3206 (2013.01); C04B 2235/3208 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3224 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3229 (2013.01); C04B 2235/3241 (2013.01); C04B 2235/3272 (2013.01); C04B 2235/3418 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/604 (2013.01); C04B 2235/765 (2013.01); C04B 2235/81 (2013.01); C04B 2235/96 (2013.01); C04B 2235/9653 (2013.01); C04B 2235/9661 (2013.01); C04B 2237/348 (2013.01); C04B 2237/66 (2013.01); C04B 2237/704 (2013.01)] | 4 Claims |
|
1. A zirconia sintered body configured for dental application, comprising a plurality of sintered layers,
wherein the zirconia sintered body has a flexural strength of not less than 1000 MPa measured on a test sample of the zirconia sintered body pursuant to JISR1601,
wherein the test sample is formed by:
preparing a plurality of zirconia powders, each comprising zirconia and yttria as a stabilizer that suppresses phase transition of zirconia, the plurality of zirconia powders differing in composition;
laminating the plurality of zirconia powders to form a plurality of zirconia powder layers;
vibrating the zirconia powder layers to produce interlayer boundary portions having compositional mixtures of respective zirconia powders of respective adjacent pairs of the plurality of zirconia powder layers; and
sintering the plurality of zirconia powder layers to form the zirconia sintered body,
wherein as a result of the sintering, each of the plurality of zirconia powders becomes a respective one layer of the plurality of sintered layers, the interlayer boundary portions of the plurality of sintered layers having a gradient of the compositional mixture of each of the respective adjacent pairs of the plurality of sintered layers, and
wherein the flexural strength of the test sample is measured under a condition that a load point of a three-point bending test is positioned at a position of an interlayer boundary of the plurality of sintered layers, the interlayer boundary traversing the test sample of the sintered body along a direction of load application.
|
|
3. A zirconia sintered body configured for dental application, comprising a plurality of sintered layers,
wherein a flexural strength of a test sample of the zirconia sintered body, measured pursuant to JISR1601, is not less than 90% of the flexural strength of a comparative zirconia sintered body,
wherein the test sample being formed by:
preparing a plurality of zirconia powders, each comprising zirconia and yttria as a stabilizer that suppresses phase transition of zirconia, the plurality of zirconia powders differing in composition;
laminating the plurality of zirconia powders to form a plurality of zirconia powder layers;
vibrating the zirconia powder layers to produce interlayer boundary portions having compositional mixtures of respective zirconia powders of respective adjacent pairs of the plurality of zirconia powder layers; and
sintering the plurality of zirconia powder layers to form the zirconia sintered body,
wherein the comparative zirconia sintered body is formed by sintering one composition of the plurality of zirconia powders alone at the same temperature as a sintering temperature of the test sample,
wherein as a result of the sintering, each of the plurality of zirconia powders becomes a respective one layer of the plurality of sintered layers, the interlayer boundary portions of the plurality of sintered layers having a gradient of the compositional mixture of each of the respective adjacent pairs of the plurality of sintered layers, and
wherein the flexural strength of the test sample is measured under a condition that a load point of a three-point bending test is positioned at a position of an interlayer boundary of the sintered layers, the interlayer boundary traversing the test sample of the pre-sintered body along a direction of load application.
|