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A method for preparing silicon carbide porous ceramics by microwave in-situ sintering technology

A technology of porous ceramics and silicon carbide, applied in the field of preparation of silicon carbide porous ceramics, can solve the problems of unfavorable rapid acquisition and further popularization and application of silicon carbide porous ceramics, complex process, high cost, good electromagnetic response and simple preparation process. , fast effect

Active Publication Date: 2019-07-26
ZHANGJIAGANG DONGDA IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] It can be seen that the above-mentioned methods generally have the disadvantages of long cycle, complicated process and high cost, which are not conducive to the rapid acquisition and further popularization and application of silicon carbide porous ceramics to a certain extent. The new method of preparing high-performance silicon carbide porous ceramics is of great significance for the realization of industrialized mass production

Method used

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  • A method for preparing silicon carbide porous ceramics by microwave in-situ sintering technology
  • A method for preparing silicon carbide porous ceramics by microwave in-situ sintering technology

Examples

Experimental program
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Effect test

Embodiment example 1

[0051] Take 24g of activated carbon, 60g of nano-silica, 28g of silicon powder, 0.56g of kaolin and 5.6g of thermoplastic phenolic resin, put them together into a ball mill jar, and ball mill for 1 hour at 500rpm to make the powder evenly mixed. Then take 10 g of the mixed powder and heat press it at 100° C. and 100 MPa for 10 minutes to obtain a green body.

[0052] After the pressed green body is moved into the high-energy microwave resonant cavity, the vacuum is evacuated to about 10kPa. Set the microwave irradiation power to 5kW, start to keep warm when the temperature reaches 1400°C, turn off the microwave after 1h, let the reaction system cool down to room temperature with the furnace, and then take out the sample. The obtained porosity is 60%, the flexural strength is 15MPa, and the density is 0.9g / cm 3 SiC porous ceramics.

[0053] The crystal phase of silicon carbide ceramics was determined by X-ray powder diffractometer (XRD) (see figure 1 ), the pore structure wa...

Embodiment example 2

[0055] The preparation method of the green body is the same as that of the implementation example 1.

[0056] After the pressed green body is moved into the high-energy microwave resonant cavity, the vacuum is evacuated to about 20kPa. Set the microwave irradiation power to 5.5kW, and start to keep warm when the temperature reaches 1500°C. After 2h, turn off the microwave oven, let the reaction system cool down to room temperature with the furnace, and then take out the sample. The obtained porosity is 45%, the flexural strength is 25MPa, and the density is 1.3g / cm 3 SiC porous ceramics.

Embodiment example 3

[0058] Take 24g of activated carbon, 60g of nano-silica, 28g of silicon powder, 1.12g of kaolin, 1.12g of alumina and 11.2g of thermoplastic phenolic resin, put them together into a ball mill jar, and ball mill for 2 hours at 500rpm to make the powder evenly mixed. Then take 10g of the mixed powder and heat press it at 100°C and 100MPa for 10min to obtain a green compact.

[0059] After the pressed green body is moved into the high-energy microwave resonant cavity, the vacuum is evacuated to about 10kPa. Set the microwave irradiation power to 6kW, and start to keep warm when the temperature reaches 1600°C. After 3 hours, turn off the microwave oven, let the reaction system cool down to room temperature with the furnace, and then take out the sample. The obtained porosity is 38%, the flexural strength is 27MPa, and the density is 1.3g / cm 3 SiC porous ceramics.

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Abstract

The invention provides a method for preparing a silicon carbide porous ceramic by using a microwave in-situ sintering technology. The preparation process comprises: carrying out ball mill mixing and hot pressing on a main material and an auxiliary material to obtain a billet, wherein the main material comprises a carbon source and a silicon source, and the auxiliary material comprises a combustion aid and a binder; and placing the billet into a high energy microwave oven resonance cavity, and preparing the silicon carbide porous ceramic by using microwave irradiation heating, wherein the carbon source is one selected from active carbon and graphite, the silicon source is silicon powder and / or nanometer silica, the combustion aid is one or a plurality of materials selected from kaolin, alumina and boron carbide powder, and the binder is a thermoplastic phenol formaldehyde resin. According to the present invention, the obtained silicon carbide porous ceramic has characteristics of good three-dimensional pore structure, uniform pore size distribution and high flexural strength, and can be used in the fields of vehicle tail gas treatment catalyst carriers, high temperature gas purifiers, heat exchangers, and the like.

Description

technical field [0001] The invention relates to the technical category of preparing silicon carbide porous ceramics, in particular to a method for preparing silicon carbide porous ceramics with a three-dimensional crosslinked pore structure based on high-energy microwave technology. Background technique [0002] Silicon carbide porous ceramic is a new type of functional and structural material, due to its low density, high strength, large specific surface area, outstanding chemical stability, excellent high temperature resistance and thermal shock resistance, and good heat insulation , are widely used in catalyst carriers, heat exchangers, gas-liquid filtration and advanced thermal insulation materials, etc. [0003] At present, a variety of methods for preparing silicon carbide porous ceramics have been successfully developed, such as adding pore-forming agents, liquid phase sintering, reaction sintering, templates, and sol-gel methods. The method of adding pore-forming ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/64C04B35/65C04B38/06
CPCC04B35/573C04B35/64C04B38/068C04B2235/3217C04B2235/3418C04B2235/349C04B2235/3821C04B2235/422C04B2235/425C04B2235/428C04B2235/667C04B2235/77C04B2235/96C04B38/0074C04B38/0067
Inventor 王继刚余永志周清张浩张安蕾顾永攀
Owner ZHANGJIAGANG DONGDA IND TECH RES INST
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