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Cordierite-silicon carbide reticular porous material for porous medium combustion and preparation method thereof

A mesh porous, porous media technology, applied in the field of dielectric materials for porous media combustion technology, can solve the problems of large equipment investment, complex process, low high-temperature infrared emissivity, etc., to increase life and heating efficiency, improve mechanical properties, The effect of simple preparation process

Active Publication Date: 2022-08-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology requires a large investment in equipment and complicated processes. The aluminum oxide coating formed on the surface of silicon carbide foam ceramics significantly reduces the high-temperature radiation performance of silicon carbide foam ceramics due to its low high-temperature infrared emissivity; in addition, silicon carbide foam ceramics The formation of alumina anti-oxidation coating on the surface only improves the anti-oxidation ability of the material, but does not synergistically improve the mechanical properties and thermal shock resistance of silicon carbide foam ceramics.

Method used

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  • Cordierite-silicon carbide reticular porous material for porous medium combustion and preparation method thereof
  • Cordierite-silicon carbide reticular porous material for porous medium combustion and preparation method thereof
  • Cordierite-silicon carbide reticular porous material for porous medium combustion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A cordierite-silicon carbide mesh porous material for porous media combustion and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0044] Step 1: Mix 70-72wt% of silicon carbide, 19-22wt% of andalusite and 9-10wt% of kaolin to obtain mixed powder I; then add 0.3-0.6t% of carboxymethyl fiber to mixed powder I Slurry I was prepared by stirring for 30-35 min with 25-30 wt% water.

[0045] Step 2, according to the molar ratio of activated alumina powder: magnesium hydroxide: silicon micropowder is 2: 2: 5 ingredients, mix, namely obtain mixed powder II, mix 55~58wt% cordierite micropowder, 13~15wt% carbon The source and 27-30 wt% of mixed powder II are evenly mixed to obtain mixed powder III, and then 0.3-0.6 wt. Slurry II was obtained.

[0046] Step 3: Immerse the polyurethane sponge in the slurry I, immerse it for 10-15 minutes, squeeze the rollers, and dry it at 95-100°C for 12-16h; 400 ° C, heat preservation for 0...

Embodiment 2

[0051] A cordierite-silicon carbide mesh porous material for porous media combustion and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0052] Step 1: Mix 72-74wt% silicon carbide, 18-20wt% andalusite and 8-9wt% kaolin to obtain mixed powder I; then add 0.2-0.5wt% carboxymethyl fiber to the mixed powder I Slurry I was prepared by stirring for 40 to 45 min with 30 to 35 wt % of water.

[0053] Step 2, according to the molar ratio of activated alumina powder: magnesium hydroxide: silicon micropowder is 2:2:5 ingredients, mix to obtain mixed powder II, mix 58~60wt% cordierite micropowder, 11~14wt% carbon The source and 25-29wt% of mixed powder II are evenly mixed to obtain mixed powder III, then 0.5-0.8wt% of polycarboxylate and 38-43wt% of water are added to mixed powder III, and ball milled for 2.5-3.5h, Slurry II was prepared.

[0054] Step 3: Immerse the polyurethane sponge in the slurry I, immerse it for 15-20 minutes...

Embodiment 3

[0059] A cordierite-silicon carbide mesh porous material for porous media combustion and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0060] Step 1: Mix 75-77wt% silicon carbide, 16-18wt% andalusite and 7-8wt% kaolin to obtain mixed powder I; then add 0.6-0.9wt% carboxymethyl fiber to mixed powder I and 35-40 wt % of water, stirring for 55-60 min to prepare slurry I.

[0061] Step 2, according to the molar ratio of activated alumina powder: magnesium hydroxide: silicon micropowder is 2:2:5 ingredients, mix to obtain mixed powder II, mix 62~65wt% cordierite micropowder, 8~10wt% carbon The source and 26-28wt% of mixed powder II are evenly mixed to obtain mixed powder III, then 0.7-1.0wt% of polycarboxylate and 25-30wt% of water are added to mixed powder III, and ball milled for 3-4 hours to prepare Slurry II was obtained.

[0062] Step 3: Immerse the polyurethane sponge in the slurry I, immerse it for 20-25 minutes, squ...

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Abstract

The invention relates to a cordierite-silicon carbide reticular porous material for porous medium combustion and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: uniformly mixing silicon carbide, andalusite, kaolin, carboxymethyl cellulose and water to prepare slurry I; uniformly mixing cordierite micro powder, activated aluminum oxide powder, magnesium hydroxide, silicon micro powder, a carbon source, polycarboxylate and water to prepare slurry II; dipping polyurethane sponge in the slurry I, carrying out double-roller extrusion and drying, and carrying out heat preservation at 300-600 DEG C for 0.5-3 hours to obtain a silicon carbide reticular porous material preform; then carrying out vacuum impregnation by using the slurry II, and drying to obtain a cordierite-silicon carbide reticular porous material blank; and finally, keeping the temperature for 2-4 hours in an air atmosphere at the temperature of 1100-1350 DEG C to prepare the cordierite-silicon carbide reticular porous material for porous medium combustion. The preparation method has the characteristics of simple process and low cost, and the prepared product is uniform in pore structure, high in high-temperature infrared emissivity and excellent in thermal shock resistance and high-temperature water vapor oxidation resistance.

Description

technical field [0001] The invention belongs to the field of medium materials for porous medium combustion technology. In particular, it relates to a cordierite-silicon carbide mesh porous material for porous media combustion and a preparation method. Background technique [0002] Porous medium combustion technology is the "super-adiabatic" stable combustion of gaseous fuels in a three-dimensional network porous medium. It has the characteristics of high combustion efficiency, ultra-low emissions, and clean utilization of low-calorific fuels. It is of great significance for improving the utilization rate of fossil energy and reducing carbon emissions. major. At present, this technology has been promoted on a large scale in the low temperature field (<600°C), such as household heaters, heaters, automobile heating systems, etc. The media materials involved include metal alloy mesh and carbon fiber felt. However, for metallurgical, building materials and chemical companies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/195C04B35/622C04B38/06
CPCC04B35/565C04B35/195C04B35/622C04B38/0615C04B2235/3463C04B2235/349C04B2235/3217C04B2235/3206C04B2235/3418C04B2235/606C04B2235/6562C04B2235/6567C04B2235/424C04B2235/422C04B2235/48C04B2235/96Y02E20/34
Inventor 梁雄赵冬贤李亚伟潘丽萍桑绍柏王庆虎
Owner WUHAN UNIV OF SCI & TECH
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