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Porous ceramic material with controllable porosity change and preparation method thereof

A technology of porous ceramics and porosity, which is applied in the field of porous ceramic materials with controllable porosity changes and its preparation. It can solve the problems of non-porous materials, limited application range, and complex process of traditional methods, so as to achieve stable production process and broaden applications. Range, highly reproducible results

Active Publication Date: 2020-07-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation method has a sudden change in porosity at the interface of different layers, and it is difficult to achieve a continuous change in porosity, so that the function of porous materials cannot be maximized; the change in porosity cannot be precisely controlled, which limits its application Scope; the traditional method is complex, the production process is poor in stability and reproducibility, the pore structure of porous materials is difficult to control, and it is difficult to achieve mass production

Method used

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  • Porous ceramic material with controllable porosity change and preparation method thereof
  • Porous ceramic material with controllable porosity change and preparation method thereof
  • Porous ceramic material with controllable porosity change and preparation method thereof

Examples

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preparation example Construction

[0050] The invention provides a method for preparing a porous ceramic material with controllable porosity change, comprising the following steps:

[0051] Step S1: According to the variation of the porosity of the porous ceramic material with the thickness, the variation of the solid phase content of the ceramic slurry for preparing the porous ceramic material with the thickness is determined.

[0052] Under the premise that the material composition and preparation process are constant, there is a one-to-one correspondence between the solid phase content of the ceramic slurry and the porosity of the porous ceramic material. The corresponding relationship between porosity and solid phase content can be determined through experiments. By controlling the change law of the solid phase content in the ceramic slurry with the thickness, the porosity of the porous ceramic material obtained after sintering also changes regularly with the thickness. That is, by controlling the change r...

Embodiment 1

[0103] This embodiment provides a method for preparing a porous ceramic material with controllable porosity change, which includes the following steps in sequence:

[0104] Step S1: The porosity of the porous ceramic material increases linearly from 34vol% to 83vol% in the thickness direction, and the change size in the thickness direction is 12.20mm, and then the porosity decreases linearly from 83vol% to 52vol%, and the change size in the thickness direction is 7.80mm. The corresponding relationship between porosity and solid phase content is determined through experiments, and the variation law of solid phase content in ceramic slurry with thickness is determined by considering factors such as sintering shrinkage rate and machining allowance, as follows: figure 2 shown. The solid phase content decreases linearly from 60vol% to 10vol% in the thickness direction, and the decreasing change satisfies the equation y=-0.04x+0.6, 0≤x≤12.5, and then the solid phase content increas...

Embodiment 2

[0115] This embodiment provides a method for preparing a porous ceramic material with controllable porosity change, which includes the following steps in sequence:

[0116] Step S1: The porosity of the porous ceramic material increases from 38vol% to 85vol% in the thickness direction according to the parabola equation, and the change size in the thickness direction is 12.20mm, and then the porosity decreases from 85vol% to 56vol% according to the parabola equation, and the change size in the thickness direction is 7.80mm. The corresponding relationship between porosity and solid phase content was determined through experiments, and factors such as sintering shrinkage and machining allowance were comprehensively considered to determine the change law of solid phase content in ceramic slurry with thickness, as shown in Figure 7 shown. In the thickness direction, the solid phase content gradually decreases from 60vol% to 10vol%, and the decreasing change satisfies the equation ...

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Abstract

The invention provides a porosity change controllable porous ceramic material and a preparation method thereof. According to the change rule of the porosity change of the porous ceramic material withthe thickness, the change rule of the solid phase content of ceramic slurry for preparing the porous ceramic material with the thickness is determined; in the 3D printing process, according to the change rule of the ceramic slurry solid phase content, the adding mass of first slurry containing a ceramic phase and hydrosol is controlled, and printing is conducted layer by layer; an obtained ceramicslurry gel block is subjected to low temperature freezing, vacuum freeze drying is conducted, and a dried ceramic green body is obtained; sintering and cooling are conducted, and the porous ceramic material can be obtained. The porosity change controllable porous ceramic material is simple in technology, and use requirements of different fields can be met.

Description

technical field [0001] The invention relates to the technical field of preparation of porous ceramic materials, in particular to a porous ceramic material with controllable porosity change and a preparation method thereof. Background technique [0002] Porous materials have the characteristics of high porosity, large specific surface area, and adjustable pore shape, pore size and pore distribution. They are environmentally friendly green materials and structural functional materials. They can be used as thermal insulation materials, filter materials, and catalysts. Carriers, sound-absorbing and wave-transmitting materials have broad development and application prospects in the fields of biomedicine, petroleum, chemical industry, aerospace, national defense and military industry. [0003] Porous materials containing multiple porosities were first used in fields such as filtration, gas separation, and dust removal, which can maximize efficiency and save energy consumption comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/624C04B38/00
CPCC04B35/624C04B38/0045C04B2235/3217C04B2235/3244C04B2235/3463C04B2235/349C04B2235/3826C04B2235/3873C04B2235/447C04B35/00C04B38/0074
Inventor 刘强叶枫张海礁张标高晔
Owner HARBIN INST OF TECH
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