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Sintered zirconia, and sintering composition and calcined object therefor

A zirconia and sintered body technology, applied in zirconia and other directions, can solve the problems of crystal structure damage, inability to ensure strength, and unresolved long-term stability

Active Publication Date: 2013-05-01
NORITAKE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the sintered body is made of zirconia alone, the crystal structure is destroyed due to the phase transformation, so the sintered body of zirconia alone has the disadvantage that it cannot ensure sufficient strength as a product.
In addition, the sintered body of zirconia monomer also has the disadvantage that the size of the sintered body changes due to the volume change caused by the phase transformation
[0006] However, partially stabilized zirconia is only partially stabilized, so the problem of long-term stability is not solved

Method used

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  • Sintered zirconia, and sintering composition and calcined object therefor
  • Sintered zirconia, and sintering composition and calcined object therefor
  • Sintered zirconia, and sintering composition and calcined object therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～24

[0202]Zirconia sintered bodies with different contents of each element and sintering temperature were produced, and hydrothermal treatment was performed as an accelerated test of low-temperature deterioration for each zirconia sintered body, and the degree of monoclinic crystal in the hydrothermally treated zirconia sintered body was confirmed. peak ratio. In addition, flexural strength and fracture toughness values ​​were also measured for each zirconia sintered body.

[0203] In this example, yttria was used as a stabilizer. Phosphoric acid was used as the phosphorus-containing compound for adding phosphorus. As the boron-containing compound for adding boron, boron oxide or boric acid is used. In Examples 1 to 24, instead of using several types of partially stabilized zirconia crystal powders having different stabilizer content rates, one type of partially stabilized zirconia crystal powders having a stabilizer content rate was used. In Examples 1 to 22, partially stabili...

Embodiment 25～32

[0254] In order to confirm the effect of adding boron, for the zirconia sintered body containing a certain amount of phosphorus and silica, only the addition rate of boron oxide was changed, and the monoclinic crystal after hydrothermal treatment was confirmed in the same manner as in Examples 1 to 24. peak ratio. The method for producing the zirconia sintered body, the method for hydrothermal treatment, and the method for measuring X-ray diffraction lines are the same as in Examples 1 to 24. For the zirconia sintered body to which phosphorus was not added as Comparative Example 2, the peak ratio of the monoclinic crystal was similarly confirmed. In the zirconia sintered bodies of each Example and Comparative Example 2, the conditions other than the addition rate of phosphorus and the addition rate of boron oxide are: in the composition for sintering, the content of zirconia (yttria concentration: 3 mol%) in the base material The ratio is 92.6% by mass and the content of alum...

Embodiment 33～40

[0259] In order to confirm the effect of adding silica, for the zirconia sintered body containing a certain amount of phosphorus and boron, only the addition rate of silica was changed, and the monoclinic crystal after hydrothermal treatment was confirmed in the same manner as in Examples 1 to 24. peak ratio. The method for producing the zirconia sintered body, the method for hydrothermal treatment, and the method for measuring X-ray diffraction lines are the same as in Examples 1 to 24. In the zirconia sintered body of each example, the conditions other than the addition rate of phosphorus and the addition rate of boron oxide are: in the composition for sintering, the content rate of zirconia (yttria concentration: 3 mol%) in the base material is 92.6 mass % and the content of alumina was 7.4% by mass, the addition rate of the binder to the base material was 6%, and the sintering temperature was 1450°C. Table 14 shows the peak ratio measurement results of the monoclinic crys...

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Abstract

Provided is sintered zirconia which can be inhibited from deteriorating at low temperatures. Also provided are a sintering composition and a calcined object which are precursors for the sintered zirconia. The burned surface of the sintered zirconia gives an X-ray diffraction pattern in which the ratio of the height of the peak present around the location where a [200] peak assigned to the cubic system is to appear to the height of the peak present around the location where a [200] peak assigned to the tetragonal system is to appear is 0.4 or more, and a region located at a depth of 100 [mu]m or more from the burned surface gives an X-ray diffraction pattern in which the ratio of the height of the peak present around the location where a [200] peak assigned to the cubic system is to appear to the height of the peak present around the location where a [200] peak assigned to the tetragonal system is to appear is 0.3 or less.

Description

technical field [0001] [Remarks about related applications] [0002] The present invention is based on an invention claiming priority to Japanese Patent Application: Patent Application No. 2010-185586 (filed on August 20, 2010), and the entire description content of this application is incorporated and described in this specification by reference. [0003] The present invention relates to a zirconia sintered body. In addition, the present invention relates to a composition for sintering a zirconia sintered body and a calcined body (calcined body). Background technique [0004] Zirconia (ZrO 2 ) (hereinafter referred to as "zirconia") exists in polymorphs, and zirconia causes phase transitions between polymorphs. For example, tetragonal zirconia undergoes a phase transition to monoclinic. Therefore, even if the sintered body is produced by using zirconia alone, the crystal structure is destroyed due to the phase transformation, and therefore the sintered body of zirconia ...

Claims

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Application Information

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IPC IPC(8): C04B35/48
CPCC04B2235/3409C04B2235/3206C04B2235/441C04B2235/3821C01G25/02C04B2235/765C04B2235/3217C04B2235/3873C04B35/486C04B2235/3222C04B2235/96C04B35/6455C04B2235/762C04B35/4885C04B2235/785C04B2235/3418C04B2235/386C04B35/481C04B2235/42C04B2235/3463C04B2235/662C04B2235/3208C04B2235/727C04B2235/428C04B2235/72C04B2235/9669C04B2235/75C04B2235/3246C04B2235/447C04B2235/656C04B35/64
Inventor 伊藤承央加藤真示
Owner NORITAKE CO LTD
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