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Silicon carbide-based composite foamed ceramic of multilayer hole rib structure and preparation method thereof

A silicon carbide-based, composite foam technology, applied in the field of foam ceramics, can solve the problems of large equipment investment, complex process, failure to take into account the mechanical properties and thermal shock resistance of silicon carbide foam ceramics, and achieve low cost and simple process. Effect

Active Publication Date: 2016-05-04
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 complex processes, and only uses coatings to improve the high-temperature oxidation resistance of silicon carbide foam ceramics without taking into account the mechanical properties and thermal shock resistance of silicon carbide foam ceramics.

Method used

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  • Silicon carbide-based composite foamed ceramic of multilayer hole rib structure and preparation method thereof
  • Silicon carbide-based composite foamed ceramic of multilayer hole rib structure and preparation method thereof
  • Silicon carbide-based composite foamed ceramic of multilayer hole rib structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The invention discloses a silicon carbide-based composite foam ceramic with a multi-layer pore-reinforcement structure and a preparation method thereof. The steps of the preparation method are:

[0030] Step 1. Mix 70-80 parts by mass of silicon carbide, 13-20 parts by mass of alumina micropowder and 7-10 parts by mass of silicon micropowder to obtain mixed powder I; then add 0.5-2 parts by mass to mixed powder I Ammonium lignosulfonate, 0.1-0.5 parts by mass of polycarboxylate, 0.3-1 part by mass of carboxymethyl cellulose and 25-45 parts by mass of water were stirred for 30-60 minutes to prepare slurry I.

[0031] Step 2. Mix 80-94 parts of alumina micropowder with 6-20 parts of elemental silicon to obtain mixed powder II, and then add 0.3-1 part of polycarboxylate, 0.01-0.06 parts of polycarboxylate to mixed powder II. Parts by mass of absolute ethanol and 23-46 parts by mass of water, ball milled for 2-4 hours to obtain slurry II.

[0032] Step 3: Immerse the poly...

Embodiment 2

[0036] The invention discloses a silicon carbide-based composite foam ceramic with a multi-layer pore-reinforcement structure and a preparation method thereof. The preparation method shown in this embodiment is the same as in Example 1 except step 2.

[0037] Step 2, mix 65~70 parts of quality alumina micropowder with 30~35 parts of quality andalusite to obtain mixed powder II, then add 0.3~1 part of quality polycarboxylate, 0.01~0.06 Parts by mass of absolute ethanol and 23-46 parts by mass of water, ball milled for 2-4 hours to obtain slurry II.

[0038] The silicon carbide-based composite foam ceramics with multi-layer rib structure prepared in this example has been tested: the compressive strength at room temperature is 2.5-2.9 MPa; the number of water cooling cycles at 1100°C is 15-19 times; the multi-layer rib structure The SiC oxidation rate of silicon carbide-based composite foam ceramics is 3~5% after being oxidized at 1500℃ for 10 hours in air atmosphere.

Embodiment 3

[0040] The invention discloses a silicon carbide-based composite foam ceramic with a multi-layer pore-reinforcement structure and a preparation method thereof. The preparation method shown in this embodiment is the same as in Example 1 except step 2.

[0041] Step 2: Mix 70-75 parts of alumina micropowder with 20-30 parts of zircon to obtain mixed powder II, then add 0.3-1 part of polycarboxylate, 0.01- 0.06 parts by mass of absolute ethanol and 23 to 46 parts by mass of water were ball milled for 2 to 4 hours to obtain slurry II.

[0042] The silicon carbide-based composite foam ceramics with multi-layer rib structure prepared in this example has been tested: the compressive strength at room temperature is 2.5-2.8 MPa; the number of water cooling cycles at 1100°C is 15-19 times; the multi-layer rib structure The SiC oxidation rate of SiC-based composite foam ceramics is 2~5% after being oxidized at 1500℃ for 10 hours in air atmosphere.

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Abstract

The invention discloses a silicon carbide-based composite foamed ceramic of a multilayer hole rib structure and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing silicon carbide, micro alumina powder, silicon powder, ammonium lignosulfonate, polycarboxylate and water so as to prepare slurry I; uniformly mixing micro alumina powder, a silicon source polycarboxylate and water so as to prepare slurry II; then dipping polyurethane sponge in the slurry I, and successively carrying out extruding or slurry centrifugation, drying and heat preservation at 600 to 850 DEG C for 0.5 to 3 h so as to obtain a presintered body of silicon carbide foamed ceramic; subjecting the presintered body of silicon carbide foamed ceramic to vacuum dipping in the slurry II and successively carrying out slurry centrifugation and drying so as to obtain a green body of silicon carbide-based composite foamed ceramic; and carrying out heat preservation at 1300 to 1500 DEG C in an air atmosphere for 2 to 4 h so as to prepare the silicon carbide-based composite foamed ceramic of the multilayer hole rib structure. The preparation method has the characteristics of simple process and low cost; and the prepared silicon carbide-based composite foamed ceramic of the multilayer hole rib structure has high mechanical strength, good thermal shock resistance and excellent high-temperature anti-oxidation performance.

Description

technical field [0001] The invention belongs to the technical field of foam ceramics. In particular, it relates to a silicon carbide-based composite foam ceramic with a multi-layer porous structure and a preparation method thereof. Background technique [0002] With the increasingly serious energy consumption and environmental pollution, the industrial demand for efficient and environmentally friendly combustion technology is gradually increasing. Porous media combustion has good stability, high efficiency, wide flammability limit and low pollutants (especially NO x and CO) is a combustion technology that combines energy saving, emission reduction and environmental protection. Foamed ceramics are widely used as porous media burners due to their advantages of high temperature resistance, stable chemical properties and small pressure loss to gas. However, the foamed ceramics prepared by the organic foam impregnation method have poor mechanical properties and thermal shock r...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B38/06C04B41/87
CPCC04B35/565C04B38/067C04B41/009C04B41/5031C04B41/87C04B2235/3217C04B2235/3418C04B2235/5436C04B38/0615C04B41/5027C04B41/4539C04B41/455
Inventor 李亚伟梁雄桑绍柏徐义彪
Owner WUHAN UNIV OF SCI & TECH
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