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A kind of black zirconia ceramic and preparation method thereof

A technology of black zirconia and ceramics, applied in the field of ceramics, can solve the problems such as the decline of the mechanical properties of black ceramics, the uneven color of black ceramics, the limitation of development level, etc.

Active Publication Date: 2020-04-21
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese patent CN201710158058.2 and the Chinese patent CN201610853884.4 both adopt the method of adding colored pigments. Although black zirconia can be obtained, there is inevitably a certain degree of zirconia in the process of mixing the white base material and the black pigment. Inhomogeneity, resulting in uneven color of black ceramics
In addition, the inconsistent thermal expansion between the white base material and the black coloring material will lead to a serious decline in the mechanical properties of the entire black ceramic
[0005] Although there is no mixing process in the carburizing coloring method, due to the limitation of the development level of the carburizing process, it is still difficult to ensure the uniform and uniform color of the surface and interior of the prepared black ceramics

Method used

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  • A kind of black zirconia ceramic and preparation method thereof
  • A kind of black zirconia ceramic and preparation method thereof
  • A kind of black zirconia ceramic and preparation method thereof

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preparation example Construction

[0033] The invention provides a method for preparing black zirconia ceramics, comprising the following steps:

[0034] (1) Sanding the mixed slurry comprising oxide, dispersant and water to obtain sanding slurry;

[0035] The mass ratio of zirconia, yttrium trioxide, titanium oxide and aluminum oxide in the oxide is (847-940): (48-54): (5-100): (1-5);

[0036] (2) mixing the sand grinding slurry obtained in the step (1) with a binder, followed by granulation, molding, debinding and sintering to obtain primary ceramics;

[0037] (3) performing a reduction reaction on the primary ceramics obtained in the step (2) to obtain black zirconia ceramics; the temperature of the reduction reaction is 1350-1550°C.

[0038] In the present invention, unless otherwise specified, the raw materials used in the preparation method are commercially available products well known to those skilled in the art.

[0039] The invention performs sanding treatment on the mixed slurry containing oxide, d...

Embodiment 1

[0057] Based on the total mass of zirconia, yttrium trioxide, titanium oxide, and aluminum oxide as 1000 parts, accurately weigh 847 parts of zirconia, 48 parts of yttrium oxide, 100 parts of titanium oxide and 100 parts of aluminum oxide. 5 parts, dispersant ammonium methacrylate is 2.5 parts, add deionized water, adjust the solid content of the slurry to 50%, and grind the material through a sand mill for 2 hours, and the grinding body is zirconia with a particle size of 0.6-0.8mm Beads, the sanding speed is 1500r / min;

[0058] Add 0.3% of the total solid mass of polyvinyl alcohol binder to the slurry after sanding for spray granulation, adjust the atomization frequency to 46Hz, the air inlet temperature is 250°C, and the air outlet temperature is 95°C to obtain a particle size of 80 micron ceramic powder;

[0059] The ceramic granulation powder is pressed into the required ceramic body through the dry pressing process, and the ceramic product is fired at high temperature a...

Embodiment 2

[0063] Based on the total mass of zirconia, yttrium trioxide, titanium oxide, and aluminum oxide as 1000 parts, accurately weigh 866 parts of zirconia, 50 parts of yttrium trioxide, 80 parts of titanium oxide, and 4 parts of aluminum oxide. 3 parts, the dispersant ammonium polyacrylate is 3 parts, add deionized water, adjust the solid content of the slurry to 50%, and grind the material through a sand mill for 3 hours. The grinding speed is 1600r / min;

[0064] Add 0.6% of the total solid mass of polyvinyl alcohol binder to the slurry after sanding for spray granulation, adjust the atomization frequency to 38Hz, the air inlet temperature to 240°C, and the air outlet temperature to 95°C to obtain a particle size of 90 micron ceramic powder;

[0065] The ceramic granulation powder is pressed into the required ceramic body through the dry pressing process, and the ceramic product is fired at high temperature after the debinding process. The sintering temperature is 1500°C and the...

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Abstract

The invention provides a black zirconium oxide ceramic and a preparation method thereof. The preparation method comprises the following steps: sanding mixed slurry containing oxide, a dispersant and water to obtain sanded slurry, mixing the sanded slurry with a bonding agent, and sequentially granulating, moulding, debinding and sintering to obtain a primary ceramic, and then performing a reduction reaction on the primary ceramic at 1350-1550 DEG C to obtain the black zirconium oxide ceramic. With the preparation method, the particle sizes of raw materials are reduced by adopting a sanding technology, so that the mass transfer distance between particles is shortened and the mixing uniformity between the raw materials is improved; the dense primary ceramic is obtained through granulation and sintering, and the chemical valence of titanium is changed in the reduction reaction of the primary ceramic, so that the transition track of electrons changes therewith, an absorbed band changes correspondingly, and thus the white ceramic becomes a black ceramic. Results of the embodiments show that the black zirconium oxide ceramic has the blackness value of 110-200 and uniform color distribution.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a black zirconia ceramic and a preparation method thereof. Background technique [0002] ZrO 2 Ceramics have the characteristics of low thermal conductivity, low thermal expansion coefficient, high chemical stability, excellent mechanical properties, and good corrosion resistance, making them not only a research hotspot in the field of scientific research, but also widely used in various fields of industry and life, such as oxidation Zirconium grinding body, ceramic cutting tool, dental material, refractory material, oxygen sensor, instrumentation and high-grade decorative ceramic parts, etc. [0003] With the improvement of people's living standards, the requirements for colored zirconia high-grade decorative ceramics are also increasing, such as color, gloss, brightness, etc. At present, black ceramics are hot spots and difficulties in colored ceramics, and are mostly prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/622C04B35/638
CPCC04B35/48C04B35/622C04B35/638C04B2235/3217C04B2235/3225C04B2235/3232C04B2235/77C04B2235/96C04B2235/9661
Inventor 包金小张永和郭文蓉宋希文谢敏周芬郜建全王青春安胜利
Owner INNER MONGOLIA UNIV OF SCI & TECH
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