Method for electric-field-assisted low-temperature fast sintering of porous ceramics

A rapid sintering, porous ceramic technology, applied in ceramic products, applications, household appliances, etc., can solve the problems affecting the performance of porous ceramics, reduce porosity, etc., to improve particle activity and diffusion migration rate, reduce sintering time, speed up The effect of the reaction process

Inactive Publication Date: 2016-06-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the sintering of ceramics is a continuous densification process. In the traditional sintering method, the higher the sintering temperature and the longer the sintering time, the greater the degree of densification and the better the mechanical properties, but it will face a serious problem. That is to reduce the porosity and affect the performance of porous ceramics

Method used

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  • Method for electric-field-assisted low-temperature fast sintering of porous ceramics
  • Method for electric-field-assisted low-temperature fast sintering of porous ceramics
  • Method for electric-field-assisted low-temperature fast sintering of porous ceramics

Examples

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Effect test

Embodiment 1

[0025] 1) heating the porous ceramic body with a porosity of 70% to 90% to 1000°C at a heating rate of 5°C / min;

[0026] 2) Apply an electric field strength of 5V / cm to the porous ceramic body that has been heated to 1000°C. When the power supply state jumps from a constant voltage state to a constant current state, adjust the current density to 80mA / mm 2 , jump to the cooling program after timing for 10s, and cool down to room temperature at 5°C / min to obtain a zirconia porous ceramic with a porosity of 80% and a compressive strength of 9MPa.

Embodiment 2

[0028] 1) Raise the porous ceramic body with a porosity of 70% to 90% to 1000°C at a heating rate of 5°C / min;

[0029] 2) Apply an electric field strength of 5V / cm to the porous ceramic body that has been heated to 1000°C. When the power supply state jumps from a constant voltage state to a constant current state, adjust the current density to 80mA / mm 2 , jump to the cooling program after timing for 30s, and cool down to room temperature at 5°C / min to obtain a zirconia porous ceramic with a porosity of 79% and a compressive strength of 9.5MPa.

Embodiment 3

[0031] 1) Raise the porous ceramic body with a porosity of 70% to 90% to 950°C at a heating rate of 5°C / min;

[0032] 2) Apply an electric field strength of 200V / cm to the porous ceramic body that has been heated to 950°C. When the power supply state jumps from a constant voltage state to a constant current state, adjust the current density to 500mA / mm 2 , jump to the cooling program after timing for 30s, and cool down to room temperature at 5°C / min to obtain a zirconia porous ceramic with a porosity of 85% and a compressive strength of 7MPa.

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Abstract

The invention relates to a method for electric-field-assisted low-temperature fast sintering of porous ceramics. The temperature of a porous ceramics body is raised to a proper temperature, and fast sintering of the ceramics can be achieved through proper electric field intensity. Different electric field intensity conditions can be selected according to different porous ceramic materials. In the transmission process of matter excited by electric field energy, the particle activity is improved, the diffusion migration speed is increased, ceramics particles are rapidly sintered, sintering temperature can be effectively lowered, and sintering time can be effectively shortened. By means of the method for electric-field-assisted low-temperature fast sintering, the porous ceramics which is high in strength and high in porosity can be acquired.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic material preparation, and in particular relates to a method for electric field-assisted low-temperature rapid sintering of porous ceramics. Background technique [0002] Porous ceramic materials refer to inorganic non-metallic materials that form a large number of pores during the molding and sintering process. Porous ceramics contain many pores that are closely connected to each other. According to the structure of the pores, they can be divided into three categories: closed pores, open pores and through pores. Porous ceramics have excellent properties such as low thermal conductivity, high porosity, good high temperature stability, and physical and chemical stability. [0003] The application of porous ceramics is based on high porosity. When the porosity of ceramics is increased, excellent porous performance can be obtained, but the reduction of strength will limit its application. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/48C04B35/64
CPCC04B35/48C04B35/64C04B38/00C04B2235/666C04B2235/96
Inventor 王一光刘金玲陈意高刘佃光
Owner NORTHWESTERN POLYTECHNICAL UNIV
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