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Zirconia sintered body, and zirconia composition and calcined body

A technology of zirconia and sintered body, which is applied in the direction of dentures, etc., can solve the problems of reduced durability of zirconia sintered body and the inability to obtain high dimensional accuracy, and achieve the effect of high bending strength and fracture toughness

Active Publication Date: 2019-04-05
KURARAY NORITAKE DENTAL
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, a sintered body of tetragonal zirconia whose phase transformation is not suppressed cannot obtain a product with high dimensional accuracy
Furthermore, when a phase transition occurs, the durability of the zirconia sintered body will also decrease

Method used

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  • Zirconia sintered body, and zirconia composition and calcined body
  • Zirconia sintered body, and zirconia composition and calcined body
  • Zirconia sintered body, and zirconia composition and calcined body

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Embodiment

[0082] A zirconia sintered body was produced, and the flexural strength, fracture toughness, and peak ratio of the monoclinic crystal after the hydrothermal treatment were measured. In addition, in some examples, the transmittance or the Lab color space of the zirconia sintered body was measured. Table 1 shows the addition rate of yttrium oxide, the addition rate of alumina, the addition rate of titania, and the addition rate of silica as a stabilizer with respect to zirconia. In Examples 1 to 27, a zirconia sintered body was produced using zirconia powder manufactured by Noritake Campanile Limited. The addition rate of yttrium oxide is the addition rate with respect to the total number of moles of zirconia and yttrium oxide. Alumina, titania, and silica are addition rates relative to the total mass of zirconia and yttrium oxide. In addition, the average particle diameters of the large particle diameter powder and the small particle diameter powder are also shown. Furthermo...

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Abstract

In the cross-sectional photograph of the zirconia sintered body, based on the cross-sectional area of ​​each zirconia particle, the converted particle diameter when the cross-sectional shape of each zirconia particle is assumed to be circular is calculated, and based on the converted particle diameter, each zirconia When the particle classification is less than 0.4 μm, 0.4 μm or more and less than 0.76 μm, and 0.76 μm or more, in each grade, calculate the ratio of the cross-sectional area of ​​each grade to the total cross-sectional area of ​​the total zirconia particles for which the cross-sectional area is calculated , the ratio of the cross-sectional area of ​​zirconia particles with a converted particle size of less than 0.4 μm is 4% to 35%, and the ratio of the cross-sectional area of ​​zirconia particles with a converted particle size of 0.4 μm to less than 0.76 μm is 24% or more and 57% or less, and the cross-sectional area ratio of zirconia particles having a converted particle diameter of 0.76 μm or more is 16% or more and 62% or less.

Description

technical field [0001] [Remarks for related applications] [0002] This invention is based on Japanese patent application: Japanese Patent Application No. 2013-048461 (applied on March 11, 2013), and all the descriptions of this application are incorporated in this specification by reference. [0003] The present invention relates to a zirconia sintered body. In addition, the present invention relates to a composition and a calcined body for producing a zirconia sintered body. Background technique [0004] Zirconia (IV) (ZrO 2 ) (hereinafter referred to as "zirconia".) Polymorphs exist in zirconia, and zirconia undergoes phase transformation between polymorphs. For example, tetragonal zirconia undergoes a phase transition to a monoclinic system. This phase transition destroys the crystal structure of zirconia. Therefore, the sintered body of tetragonal zirconia whose phase transformation is not suppressed does not have sufficient strength to be used as a product. In ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48A61C13/083
CPCC04B35/486C04B35/62645C04B2235/3217C04B2235/3225C04B2235/3232C04B2235/3418C04B2235/5445C04B2235/5454C04B2235/5472C04B2235/782C04B2235/785C04B2235/9653C04B35/49C04B35/64
Inventor 山田芳久松本笃志伊藤承央
Owner KURARAY NORITAKE DENTAL
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