Powder for black zirconia sintered body, production method thereof, and sintered body thereof

A black zirconia, sintered body technology, applied in chemical instruments and methods, inorganic chemistry, zirconium compounds, etc., can solve problems such as reducing the amount of addition

Active Publication Date: 2008-05-07
TOSOH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since existing colorants require excess Al 2 o 3 , cannot form a deep enough black, so in order to obtain a sufficient color tone, even if the manufacturing yield is reduced due to cracking, etc., the use of Al should be reduced. 2 o 3 amount added

Method used

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  • Powder for black zirconia sintered body, production method thereof, and sintered body thereof
  • Powder for black zirconia sintered body, production method thereof, and sintered body thereof
  • Powder for black zirconia sintered body, production method thereof, and sintered body thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Zirconia powder TZ-3YS-E manufactured by Tosoh Co., Ltd. at 96.0% by weight (except for Y with 5.35% by weight) 2 o 3 Contains 0.25% by weight of Al in addition to stabilized zirconia 2 o 3 , BET specific surface area is 6m 2 In / g), the coprecipitate obtained by adding ammonia water to the aqueous nitrate solution of Co, Zn, Fe, and Al was filtered, washed with water, and dried as a colorant using 3.5% by weight of coprecipitate, and an additional 0.5% by weight was added. Al 2 o 3 The powder is wet-mixed with a ball mill and then dried to obtain a mixed powder.

[0067] Through uniaxial molding pressure 700kg / cm 2 The obtained mixed powder was molded to obtain a composite molded body. The sintering temperature of each molded body is in the range of 1300 ° C ~ 1500 ° C, set a temperature every 50 ° C, using an electric furnace, in the atmosphere, under the condition of a heating rate of 100 ° C / hour, to reach the specified temperature, each The molded body wa...

Embodiment 2

[0072] In addition to adding 3.5 wt% of dry powder as a colorant, 1.0 wt% of commercially available Al 2 o 3 Except for the powder, it was sintered for 2 hours under the same conditions as in Example 1.

[0073] In addition, when the dry powder was separately fired at 800°C, it was confirmed that the chemical composition was (Co 0.68 Zn 0.32 )(Fe 0.70 al 0.30 ) 2 o 4 .

[0074] Table 1 shows the performance evaluation results of the obtained sintered body.

Embodiment 3

[0076] Sintering was carried out for 2 hours under the same conditions as in Example 1 except that 3.5% by weight of dry powder was added as a colorant.

[0077] In addition, when the dry powder was separately fired at 800°C, it was confirmed that the chemical composition was Co(Fe 0.50 al 0.50 ) 2 o 4 .

[0078] Table 1 shows the performance evaluation results of the obtained sintered body.

[0079] Due to the absence of Zn, the generated pores increase and the bending strength decreases, but a certain degree of bending strength, brightness, and sintering uniformity can also be maintained.

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Abstract

To solve the problem of a conventional black zirconia that a uniform sintered compact is not obtained since the density, strength and color tone of the sintered compact are changed by a sintering temperature, and color transfer and pores on the surface of the sintered compact are caused by the volatilization of coloring components. The present invention provides zirconia-containing powder comprising 2-6 weight% coloring agent, 0.05 to 6 weight% of Al 2 O 3, 5.35 to 7.10 weight% Y2O3 and zirconia, wherein, the coloring agent has a spinel structure represented by the chemical formula (Co1-xZnx)(Fe1-yAly)2o4(0 x 0.5, 0 < y 0.5) or which is a coprecipitated material containing Co, Zn, Fe, and Al and has the same spinel structure after calcinations; and the black zirconia sintered compact obtained by sintering the powder containing the zirconia at the temperature from 1300 DEG C to 1500 DEG C.

Description

technical field [0001] The present invention relates to a zirconia powder for colored zirconia sintered bodies that has no defects, has a deep black gem-like appearance, has no temperature dependence of the sintered density during sintering, does not shift in color, does not crack, and the like; As well as a black zirconia sintered body with no defects and excellent appearance and a colorant suitable for black zirconia. [0002] Black zirconia sintered body is widely used for decorative parts (watch straps, watch exterior parts, watch cases, broaches (ブロichi), tie pins, cuff buttons, handbag hardware (hardware) parts, etc.), exterior decoration Parts (mobile phones, home appliances, mobile home appliances, etc.), semiconductor parts, structural parts, etc. Background technique [0003] Conventionally, colored zirconia sintered bodies, particularly deep black (dark みのある black) zirconia sintered bodies are known. Colored zirconia sintered, for example, formed from zirconia c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00
CPCC04B2235/3272C09C1/22C04B2235/3274C04B2235/763C04B35/488C01G51/006C04B2235/3225C04B2235/3217C04B2235/6562C04B2235/3222C04B41/80C04B2235/3275C04B35/44C04B2235/656C01G25/006C01P2006/12C04B2235/3241C04B2235/3284C04B41/009C04B2235/77C04B2235/96C04B2235/3246C01P2006/60C04B2235/5409C04B35/265C01P2004/03C04B41/0072C04B2111/82C01P2002/32C04B35/4885C04B2235/9661C01P2004/80C01G49/009C04B41/53C04B35/48C04B35/10C04B35/505
Inventor 藤崎浩之
Owner TOSOH CORP
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