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A method for preparing black zirconia ceramics at low temperature

A technology of black zirconia and ceramics, which is applied in the field of preparation of low-temperature sintered black zirconia ceramic materials, which can solve the problems of material strength, hardness and corrosion resistance reduction, and achieve the effects of avoiding toxic effects, narrow size distribution and uniform particle size

Inactive Publication Date: 2012-02-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, since the present invention does not add sintering aids, it overcomes the disadvantages of reducing material strength, hardness and corrosion resistance caused by sintering aids in conventional preparation methods.

Method used

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  • A method for preparing black zirconia ceramics at low temperature
  • A method for preparing black zirconia ceramics at low temperature
  • A method for preparing black zirconia ceramics at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Black ZrO 2 Preparation of ceramics:

[0036] (1) Raw material preparation: zirconium oxychloride ZrOCl 2 ·8H 2 O and Y (NO 3 ) 3 ·6H 2 O is the raw material, and ZrOCl with a concentration of 0.2mol / L is prepared with secondary deionized water 2 -Y(NO 3 ) 3 solution and a 10% ammonia solution. ZrOCl 2 -Y(NO 3 ) 3 Solution according to n(ZrO 2 ) / n(Y 2 o 3 )=97 / 3. A certain amount of deionized water, ammonia water, dispersant polyethylene glycol and 6-10% solution weight hydrogen peroxide are taken as the reaction base liquid, and the pH value of the reaction base liquid is adjusted to 10. Stir the reaction base solution continuously at room temperature, and drop the two solutions prepared above (ZrOCl 2 -Y(NO 3 ) 3 solution and ammonia solution), after the dropwise addition, the stirring was continued for 1 hour, and a white sol precipitate was obtained. Stand and age at room temperature for 10 hours, use a centrifuge to separate the solid from the li...

Embodiment 2

[0052] Black ZrO 2 Preparation of ceramics:

[0053] Raw material ZrO 2 , coloring agent and green body preparation method are basically the same as embodiment one. The difference: the added amount of the coloring agent is 2wt% and 0wt%.

[0054] Characterization method:

[0055] The phase analysis of the material was carried out with a Japan Rigaku D / max X-ray diffractometer (CuKα line); the microstructure of the sample was observed with a SSX-550 scanning electron microscope; the AG-1C type of the Shimadzu universal material testing machine was used to measure the material Bending strength; test the Vickers hardness of the sample with the HV-50 Vickers hardness tester; test the bulk density of the sample with the Archimedes drainage method; soak the sample in 20% hydrochloric acid and sodium hydroxide solution for 48 hours, wash and observe Changes in surface color and gloss to evaluate its corrosion resistance.

[0056] result:

[0057] 1. Black ZrO 2 ceramic structure...

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Abstract

The invention relates to a method for preparing black zirconia ceramics at low temperature, and belongs to the technical field of high-temperature structural material preparation. Said method uses homogeneous precipitation method to synthesize nanometer coloring agent and co-precipitation method to synthesize nanometer zirconia powder, and adopts Fe-Co-Ni-Mn as colorant. Do not add any sintering aids to the zirconia powder, only add a small amount of coloring agent, and sinter at 1150-1350°C to obtain black zirconia ceramics with excellent performance and bright color. Because the invention adopts the homogeneous precipitation colorant powder, monodisperse nano particles with uniform particle size, narrow size distribution and high purity are obtained, so that the colorant is easy to color. Co-precipitation is used to synthesize zirconia powder to obtain nanoparticles with small particle size, large surface area and high activity, which can reduce the temperature of solid-phase reaction, greatly reduce the sintering temperature, and solve the problem of high-temperature decomposition and volatilization of black colorant oxides. At the same time, the present invention adopts Fe-Co-Ni-Mn as the coloring agent, which avoids the toxic effect of Cr on the human body.

Description

technical field [0001] The invention relates to a method for preparing a low-temperature sintered black zirconia ceramic material, which belongs to the technical field of high-temperature structural material preparation. Background technique [0002] Zirconium dioxide is widely used and researched in high-temperature structural materials, high-temperature optical components, oxygen-sensitive components, fuel cells, etc. . In recent years, with the rapid development of people's demand for decorations, black ZrO 2 With its excellent mechanical properties, bright colors, metallic luster, and non-allergic effects, ceramics have become the new favorite materials for high-end decoration, such as high-end watch chains, bracelets, and mobile phone casings. Therefore, the research and development of black zirconia ceramics has broad market prospects. [0003] As we all know, the preparation of ordinary black ceramics is generally obtained by adding pigment or colorant to the ceram...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/48
Inventor 司文捷吴音
Owner TSINGHUA UNIV
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