Method for preparing silicon-boron-carbon-nitrogen porous ceramic with nano pore structure

A nanoporous structure, silicon-boron-carbon-nitrogen technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of template type influence, low porosity, large difference in mechanical properties of porous ceramics, etc., to achieve easy operation, The effect of low production cost and simple method

Inactive Publication Date: 2014-07-02
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the porous ceramics prepared by the foaming method can have complex shapes and porous states of different structures, their porosity is low (generally no more than 50%)
The template synthesis method is to use the pore structure contained in the template, inject the ceramic precursor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] A nanoporous silicon-boron-carbon-nitrogen porous ceramic preparation method is characterized in that it comprises the following steps:

[0013] (1) First prepare the Si-B-C-N organic precursor. Mix boron trichloride, aniline, and dimethyl silicone oil in a molar ratio of 1:1:2.5, and mix them at 40~65 o C reacted for 4~5h to make Si-B-C-N organic precursor for use;

[0014] (2) Dip the nano polyacrylonitrile fiber in the above-mentioned Si-B-C-N organic precursor, and in 50-70 o Insulation at C for 1~2h; the amount of nano-polyacrylonitrile fiber added per 100g of Si-B-C-N organic precursor is 0.3~1.5g; the diameter of nano-polyacrylonitrile fiber is 150-200nm;

[0015] (3) Si-B-C-N organic precursor and nano-polyacrylonitrile fiber mixture prepared above are cooled to room temperature and put into atmosphere protection sintering furnace; o C / min heating rate up to 1200 o C, and at 1200 o C insulation for 1.5~2.5h; the sintering furnace is fed with high-purity nitr...

Embodiment 1

[0018] Embodiment 1: a kind of nanoporous structure silicon boron carbon nitrogen porous ceramic preparation method, it comprises the following steps:

[0019] (1) First prepare the Si-B-C-N organic precursor. Mix boron trichloride, aniline, and dimethyl silicone oil in a molar ratio of 1:1:2.5, and mix them at 40 o C reacted for 5h to prepare Si-B-C-N organic precursor for use;

[0020] (2) Dip nano-polyacrylonitrile fibers (fiber diameter 150-200nm) in the above-mentioned Si-B-C-N organic precursor, and o Insulation under C for 1h; wherein the addition of nano-polyacrylonitrile fibers in every 100g of Si-B-C-N organic precursor is to add 1.0g;

[0021] (3) Si-B-C-N organic precursor and nano-polyacrylonitrile fiber mixture prepared above are cooled to room temperature and put into atmosphere protection sintering furnace; o C / min heating rate up to 1200 o C, and at 1200 o C for 2 hours; the sintering furnace is fed with high-purity nitrogen (99.999% pure) as a protective ...

Embodiment 2

[0023] Embodiment 2: a kind of nanoporous structure silicon boron carbon nitrogen porous ceramic preparation method, it comprises the following steps:

[0024] (1) First prepare the Si-B-C-N organic precursor. Mix boron trichloride, aniline, and dimethyl silicone oil in a molar ratio of 1:1:2.5, and mix them at 50 o C was reacted for 4.5h, and the Si-B-C-N organic precursor was prepared for use;

[0025] (2) Dip nano-polyacrylonitrile fibers (fiber diameter 150-200nm) into the above-mentioned Si-B-C-N organic precursor, and o C under insulation 1.5h; Wherein every 100gSi-B-C-N organic precursor in the addition amount of nano-polyacrylonitrile fiber is to add 1.5g;

[0026] (3) Si-B-C-N organic precursor and nano-polyacrylonitrile fiber mixture prepared above are cooled to room temperature and put into atmosphere protection sintering furnace; o C / min heating rate up to 1200 o C, and at 1200 o C for 1.5h; the sintering furnace is fed with high-purity nitrogen (99.999% pure) ...

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Abstract

The invention relates to a method for preparing silicon-boron-carbon-nitrogen porous ceramic with a nano pore structure. The method comprises the following steps: uniformly mixing boron trichloride, aniline and simethicone according to a ratio of 1:1:2.5, and heating to react to prepare an organic precursor; then dipping nano polyacrylonitrile fibers in the organic precursor and performing heat preservation at a certain temperature; finally sintering the mixture in a high-purity nitrogen atmosphere, and cooling the mixture to room temperature with the furnace after the heat preservation is finished, wherein after the high temperature nitrogen treatment, the nano polyacrylonitrile fibers are corroded to form silicon-boron-carbon-nitrogen (Si-B-C-N) porous ceramic with the nano pore structure. The aperture of the obtained silicon-boron-carbon-nitrogen (Si-B-C-N) porous ceramic is 150-300 nm, the porosity is up to 78-90%, the silicon-boron-carbon-nitrogen (Si-B-C-N) porous ceramic is high temperature resistant, oxidation resistant, free of obvious oxidation at 950 DEG C in an air atmosphere, and free of obvious loss of mechanical property at 1100 DEG C. The silicon-boron-carbon-nitrogen (Si-B-C-N) porous ceramic can be applied to a diesel exhaust particulate filter (DPF) carrier.

Description

technical field [0001] The invention relates to a method for preparing a composite ceramic material, in particular to a method for preparing a nanoporous silicon-boron-carbon-nitrogen porous ceramic. Background technique [0002] As the environment and ecological pollution become more and more serious, the phenomenon of urban smog is also becoming more and more serious, seriously affecting people's life and health, and the problem of air purification has aroused widespread concern in the society. As a good filter carrier, porous ceramics play an important role in air purification and filtration in various industries. The preparation methods of porous ceramics commonly used today include: organic foam impregnation method, foaming method, template synthesis method, etc. The organic foam impregnation method is to use a porous carrier (such as foam plastic) to absorb ceramic slurry, and then burn out the carrier material at high temperature to form a pore structure. , and the ...

Claims

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Application Information

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IPC IPC(8): C04B35/515C04B35/622C04B38/00
Inventor 张涛曾思藩温广武夏龙钟博王春雨
Owner HARBIN INST OF TECH AT WEIHAI
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