Method for preparing high-conductivity zinc oxide ceramic at ultralow temperature

A high-conductivity, zinc oxide technology is applied in the field of ultra-low temperature preparation of high-conductivity zinc oxide ceramics, which can solve the problems of poor conductivity of ceramics, affecting the conductivity of ceramics, and low conductivity of ceramics, achieving good practicability and improving conductivity. rate, and the effect of improving crystalline properties

Active Publication Date: 2018-09-18
GUANGXI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

This type of method is relatively simple from the perspective of preparation technology, but there are still great shortcomings in the preparation of high-quality ceramic materials: on the one hand, in traditional sintering methods, zinc oxide ceramic materials generally need to be sintered at a temperature higher than 1000 ° C. Consumes a lot of energy; on the other hand, the ceramics prepared by this high-temperature sintering method generally have a large grain size, resulting in poor electrical conductivity of the ceramics
However, during the cold sintering process, due to the inconsistent dissolution of the particles in the liquid phase, an intermediate phase or amorphous phase is often formed, which seriously affects the electrical conductivity of the ceramic; in addition, due to the large number of grain boundaries at low temperature, The Schottky barrier hinders the passage of electrons, resulting in low conductivity of the ceramic

Method used

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  • Method for preparing high-conductivity zinc oxide ceramic at ultralow temperature
  • Method for preparing high-conductivity zinc oxide ceramic at ultralow temperature
  • Method for preparing high-conductivity zinc oxide ceramic at ultralow temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0026] ① Grinding and granulation: use zinc oxide powder as raw material, add 1mol / L acetic acid solution at a mass ratio of 4:1, mix thoroughly, and grind to moderately wet particles;

[0027] ②Ultra-low temperature sintering: Put the granules prepared in ① into a Φ20mm mold, the mold pressure is 300MPa, during the pressing process, the mold is heated from room temperature to 250℃ at a rate of 5℃ / min, and kept for 1h, and the obtained size is Φ20 ×3mm 3 Zinc oxide ceramic samples;

[0028] ③Heat treatment in an inert atmosphere: put the zinc oxide ceramic sample prepared in ② into an atmosphere furnace, and pass in nitrogen gas, raise the temperature from room temperature to 300°C at a rate of 2°C / min, and keep it for 10 hours to prepare high-conductivity zinc oxide ceramics.

[0029] The prepared high-conductivity zinc oxide ceramics were processed according to the test size requirements, and tested by the four-probe method. It was measured that the density of the zinc oxi...

Embodiment 2

[0031] ① Grinding and granulation: use zinc oxide powder as raw material, add 3mol / L acetic acid solution at a mass ratio of 4:1, mix thoroughly, and grind to moderately wet particles;

[0032] ②Ultra-low temperature sintering: Put the granules prepared in ① into a Φ20mm mold, and the mold pressure is 150MPa. During the pressing process, the mold is heated from room temperature to 300℃ at a heating rate of 5℃ / min, and kept for 2h, and the obtained size is Φ20 ×3mm 3 Zinc oxide ceramic samples;

[0033] ③Heat treatment in an inert atmosphere: put the zinc oxide ceramic sample prepared in ② into an atmosphere furnace, and pass in nitrogen gas, raise the temperature from room temperature to 500°C at a rate of 5°C / min, and keep it for 1h to prepare zinc oxide with high conductivity ceramics.

[0034] The prepared high-conductivity zinc oxide ceramics were processed according to the test size requirements, and tested by the four-probe method. It was measured that the density of t...

Embodiment 3

[0036] ① Grinding and granulation: use zinc oxide powder as raw material, add 3mol / L acetic acid solution at a mass ratio of 7:1, mix thoroughly, and grind to moderately wet particles;

[0037] ②Ultra-low temperature sintering: Put the granules prepared in ① into a Φ20mm mold, the mold pressure is 500MPa, during the pressing process, the mold is heated from room temperature to 120℃ at a rate of 1℃ / min, and kept for 4h, and the obtained size is Φ20 ×3mm 3 Zinc oxide ceramic samples;

[0038] ③Heat treatment in an inert atmosphere: put the zinc oxide ceramic sample prepared in ② into an atmosphere furnace, and pass in nitrogen gas, raise the temperature from room temperature to 500°C at a rate of 5°C / min, and keep it for 3 hours to prepare high-conductivity zinc oxide ceramics.

[0039] The prepared high-conductivity zinc oxide ceramics were processed according to the test size requirements, and tested by the four-probe method. It was measured that the density of the zinc oxid...

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Abstract

The invention discloses a method for preparing high-conductivity zinc oxide ceramic at ultralow temperature. The method comprises the following steps: taking zinc oxide powder as a raw material and anorganic acid solution or a zinc acetate solution as a solvent, grinding, pelleting, performing ultralow temperature sintering, and thermally treating in an inert atmosphere, thereby obtaining the zinc oxide ceramic. The densification temperature of the zinc oxide ceramic prepared according to the preparation method is far lower than that in a traditional sintering method, the density of the zincoxide ceramic prepared according to the preparation method can reach 99.0% or above, the crystalline grain size can be controlled to be below 2 mu m, and the conductivity can reach 1.5 S / cm or higher.The preparation method has the advantages of being simple in process, low in energy consumption, greens environmental protection, high practicability and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of semiconductor ceramic materials, and in particular relates to a method for preparing high-conductivity zinc oxide ceramics at ultra-low temperature. Background technique [0002] Zinc oxide is a promising semiconducting metal oxide with excellent properties such as a wide energy gap (3.37eV) and a large excitation binding energy (60meV). It is used in transparent conductive films, gas sensors and There are a large number of applications such as varistors. Zinc oxide ceramics are generally obtained by powder pressure molding and high-temperature sintering. This type of method is relatively simple from the perspective of preparation technology, but there are still great shortcomings in the preparation of high-quality ceramic materials: on the one hand, in traditional sintering methods, zinc oxide ceramic materials generally need to be sintered at a temperature higher than 1000 ° C. It consumes a lot of en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622C04B35/64
CPCC04B35/453C04B35/622C04B35/64C04B2235/658
Inventor 罗能能景阳韩凯韦悦周
Owner GUANGXI UNIV
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