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Ultralow-temperature cold sintering method of ZnO-based ceramic

An ultra-low temperature and ceramic technology, applied in the field of low-temperature ceramic sintering, can solve the problems of coarse grains, energy consumption, and easy deformation, and achieve the effects of small deformation of ceramics, improved production efficiency, and energy saving

Inactive Publication Date: 2019-01-04
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grains of the ceramics prepared by these sintering methods are relatively coarse, easy to deform, and consume a lot of energy.

Method used

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  • Ultralow-temperature cold sintering method of ZnO-based ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method for ultra-low temperature cold sintering of ZnO-based ceramics, the process steps comprising:

[0052] (1) Prepare 1mol / L acetic acid solution.

[0053] (2) Slurry preparation: Weigh 50 g of pure ZnO powder and place it in a mortar, then weigh 20% of the above-mentioned acetic acid solution of the mass of ZnO powder and add it dropwise to the powder and grind it evenly to form a slurry.

[0054] (3) Cold sintering: choose a steel mold with heating function, the diameter of the inner hole of the mold is 15mm, before using the mold, use degreased cotton dipped in absolute ethanol to wipe the inner wall of the mold, the ejector pin, and the cushion block, and wait for the mold to dry Finally, weigh an appropriate amount of slurry and put it into the mold, apply a pressure of 200MPa with a uniaxial press, and heat the mold to 50°C at a heating rate of 5°C / min, keep it warm for 10min, and then raise the temperature at 10°C / min Heating at a rate of 300° C. for 1 hou...

Embodiment 2

[0057] A method for ultra-low temperature cold sintering of ZnO-based ceramics, the process steps comprising:

[0058] (1) Prepare 0.1mol / L acetic acid solution.

[0059] (2) Slurry preparation: Weigh 10 g of pure ZnO powder and place it in a mortar, then weigh 40% of the above-mentioned acetic acid solution of the mass of ZnO powder and add it dropwise to the powder and grind it evenly to form a slurry.

[0060] (3) Cold sintering: choose a steel mold with heating function, the diameter of the inner hole of the mold is 15mm, before using the mold, use degreased cotton dipped in absolute ethanol to wipe the inner wall of the mold, the ejector pin, and the cushion block, and wait for the mold to dry Finally, weigh an appropriate amount of slurry and put it into the mold, apply a pressure of 80MPa with a uniaxial press, and heat the mold to 50°C at a heating rate of 5°C / min, keep it warm for 10min, and then raise the temperature at 10°C / min Heating at a rate of 300° C. for 4 ho...

Embodiment 3

[0063] A method for ultra-low temperature cold sintering of ZnO-based ceramics, the process steps comprising:

[0064] (1) Prepare 2mol / L acetic acid solution.

[0065] (2) Slurry preparation: Weigh 10 g of pure ZnO powder and place it in a mortar, then weigh 30% of the above-mentioned acetic acid solution of the mass of ZnO powder and add it dropwise to the powder and grind it evenly to form a slurry.

[0066] (3) Cold sintering: choose a steel mold with heating function, the diameter of the inner hole of the mold is 15mm, before using the mold, use degreased cotton dipped in absolute ethanol to wipe the inner wall of the mold, the ejector pin, and the cushion block, and wait for the mold to dry Finally, weigh an appropriate amount of slurry and put it into the mold, use a uniaxial press to apply a pressure of 300MPa, and heat the mold to 50°C at a heating rate of 5°C / min, keep it warm for 25min, and then raise the temperature at 10°C / min Heating at a rate of 100° C. for 4 h...

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Abstract

An ultralow-temperature cold sintering method of ZnO-based ceramic comprises the following steps: obtaining slurry of ZnO-based powder from an acetic acid solution with certain concentration and the ZnO-based powder by grinding and dispersing, placing the slurry in a mold, applying proper pressure, heating the mold to a certain temperature, and keeping the temperature and pressure for a period oftime to obtain the dense ZnO-based ceramic. The ZnO-based ceramic with fine and uniform grains and relative density higher than 98% can be prepared at the temperature of 300 DEG C of lower by controlling concentration and adding amount of acetic acid, applied pressure and sintering temperature and time. Compared with the traditional high-temperature sintering technique for ceramics, the method hasthe characteristics that sintering temperature is low, process is simple, energy is saved and nanocrystalline ceramic can be obtained, and can be widely applied to ultralow-temperature cold sinteringof the ZnO-based ceramic.

Description

technical field [0001] The invention belongs to the technical field of low-temperature ceramic sintering, and in particular relates to a method for ultra-low temperature cold sintering of ZnO-based ceramics. Background technique [0002] With the rapid development of semiconductor technology, electronic components and solar energy and other fields, ZnO-based ceramic materials are widely used in high-definition flat panel displays, transparent electrodes, solar panels and various optoelectronic devices. Varistors made of ZnO-based semiconductor ceramics are widely used in electric power, communication, DC power transmission and distribution, communications, transportation, electronics, military and other fields. For example, Al-doped ZnO ceramics (AZO) can be used to prepare transparent conductive films, which are widely used in the fields of solar thin-film batteries and transparent conductive film electrodes, but AZO targets are generally sintered at high temperature and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622C04B35/64
CPCC04B35/453C04B35/622C04B35/64C04B2235/602C04B2235/6562C04B2235/6567C04B2235/786
Inventor 朱归胜江旭鹏徐华蕊赵昀云张秀云宋金杰颜东亮
Owner GUILIN UNIV OF ELECTRONIC TECH
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