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Method for utilizing thermally induced phase separation technology to prepare porous ceramic

A technology of thermally induced phase separation and porous ceramics, which is applied in the field of preparation of porous ceramics. It can solve the problems of affecting performance, difficult to control the shape of pores, and uneven distribution of pores, and achieve the effects of reducing production cycle, single raw material, and reducing energy consumption.

Inactive Publication Date: 2013-12-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

thereby affecting its performance
In addition, there are other problems in these methods: 1, uneven distribution of pores
2. The shape of the stomata is difficult to control
At present, there are no literature and open invention patents using this method to prepare porous ceramics at home and abroad.

Method used

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  • Method for utilizing thermally induced phase separation technology to prepare porous ceramic
  • Method for utilizing thermally induced phase separation technology to prepare porous ceramic
  • Method for utilizing thermally induced phase separation technology to prepare porous ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0030] according to figure 1 The process shown in this example is a method for preparing porous ceramics using thermally induced phase separation technology. The specific implementation process is as follows:

[0031] (1) Configuration of saturated benzoic acid solution: Weigh 100g of absolute ethanol, add 140g of BA to it, place in a water bath crucible at 60°C, and stir with an electromagnetic stirrer until BA is completely dissolved to form a clear solution;

[0032] (2) Preparation of ceramic slurry: mix 150g of silicon nitride ceramics and their sintering aids (142.5g of silicon nitride ceramics, sintering aids Y 2 o 3 7.5g) into the prepared solution, add 4.5g of dispersant PVP to the solution, stir with an electromagnetic stirrer at 60°C for 4h, and the stirring speed is 200r / min;

[0033] (3) Forming the green body: Place the evenly stirred ceramic slurry at 30°C to cause solid-liquid phase separation in the supersaturated solution to precipitate the pore-forming age...

Embodiment 2

[0038] according to figure 1 The process shown in this example is a method for preparing porous ceramics using thermally induced phase separation technology. The specific implementation process is as follows:

[0039] (1) Configuration of saturated benzoic acid solution: Weigh 100g of absolute ethanol, add 140g of BA to it, place in a water bath crucible at 60°C, and stir with an electromagnetic stirrer until BA is completely dissolved to form a clear solution;

[0040] (2) Preparation of ceramic slurry: mix 150g of silicon nitride ceramics and their sintering aids (142.5g of silicon nitride ceramics, sintering aids Y 2 o 3 7.5g) into the prepared solution, add 4.5g of dispersant PVP to the solution, stir for 3 hours at 60°C with an electromagnetic stirrer, and the stirring speed is 300r / min;

[0041] (3) Body forming: Cool the uniformly stirred ceramic slurry to 40°C at a cooling rate of 5°C / min, the supersaturated solution undergoes solid-liquid phase separation, and preci...

Embodiment 3

[0046] according to figure 1 The process shown in this example is a method for preparing porous ceramics using thermally induced phase separation technology. The specific implementation process is as follows:

[0047] (1) Configuration of saturated benzoic acid solution: Weigh 100g of absolute ethanol, add 140g of BA to it, place in a water bath crucible at 60°C, and stir with an electromagnetic stirrer until BA is completely dissolved to form a clear solution;

[0048] (2) Preparation of ceramic slurry: Mix 150g of silicon powder, alumina powder and sintering aid (Si: Al 2 o 3 =30:67,Y2 o 3 Accounting for 3% of the mass of the mixture), pour it into the prepared solution, add 4.5g of dispersant PVP to the solution, stir for 2 hours at 60°C with an electromagnetic stirrer, and the stirring speed is 400r / min;

[0049] (3) Green body forming: Cool the uniformly stirred ceramic slurry to 50°C at a cooling rate of 5°C / min, the supersaturated solution undergoes solid-liquid phas...

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Abstract

The invention discloses a method for utilizing a thermally induced phase separation technology to prepare porous ceramic. The method comprises the following steps of: utilizing easily-volatilized benzoic acid BA as a pore forming agent; dissolving the pore forming agent into absolute ethyl alcohol; utilizing the thermally induced phase separation technology to control the quantity and the shape of the pore forming agent; and utilizing a traditional slip casting molding method to prepare a ceramic blank. According to the method disclosed by the invention, a phase separation temperature, a temperature reduction speed and a solution viscosity are controlled to control the quantity, the size and the shape of the phase separation pore forming agent, so that the size of the porosity and the pore shape of the porous ceramic are controlled; and the method has the advantages of controlling the shape of an air pore and the size of the air pore, and can carry out low-temperature hole formation.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous ceramics, and in particular relates to a method for preparing porous ceramics by using thermally induced phase separation technology. Background technique [0002] Porous ceramics have high porosity and large specific surface area, and can be used as filter materials for various industrial waste water and waste gas, catalyst carriers, high-temperature insulation materials and heat exchanger materials. Different application requirements have different requirements on the porosity, pore size and pore morphology of porous ceramics. At present, there are many methods for preparing porous ceramics, such as foaming method, adding pore-forming agent method, organic foam impregnation method, gel injection molding method and so on. But they all have a common feature: they need to implement heat treatment process at higher temperature (above 500°C) to eliminate pore-forming agents and other o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/622C04B35/584C04B35/599
Inventor 王红洁岳建设董斌超乔冠军史忠旗
Owner XI AN JIAOTONG UNIV
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