Alumina fiber-enhanced nano-alumina foam ceramic and preparation method thereof

A nano-alumina and alumina fiber technology, applied in the field of foam ceramics, can solve the problems of uneven performance of final products, low yield of green body, easy generation of gradients, etc., to reduce cracking and warping phenomenon, bulk density Small, quality-enhancing effects

Inactive Publication Date: 2017-12-01
JINING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that gradients are easy to occur during the grouting molding process, resulting in uneven performance of the final product; using water as a solvent, the resulting green body is easy to crack and deform, and the green body yield is low
In addition, although the addition of fibers can increase the strength of the material, due to the high porosity of the final product, the compressive strength of the product is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First prepare the solvent according to the absolute ethanol:water ratio of 9:1, then prepare the premix according to the mass ratio of solvent:monomer (AM):crosslinking agent (MBAM) 100:15:0.5, and adjust its pH value to 8 with ammonia water. Then, according to the solid content of 30% (mass fraction), the alumina fiber: nano-alumina powder mass ratio of 20:80, the nano-alumina powder and the alumina fiber were weighed. Put the nano-alumina powder, dispersant (SDS) and premix solution into a ball mill for 90 minutes and then add alumina fiber to continue the ball mill for 15 minutes. Weigh the foaming agent (hydrogen peroxide) and foam stabilizer (polyvinyl alcohol) according to the mass fraction of 3% and 0.5%, and add them to the suspension in sequence, and stir at 40°C for 2 minutes to obtain a highly foamed slurry. Add the initiator (APS) and catalyst (TEMED) into the foaming slurry, stir for 2 minutes, and then pour it into a mold of a specific size to make it soli...

Embodiment 2

[0045] First prepare the solvent according to the absolute ethanol:water ratio of 7:3, then prepare the premix according to the mass ratio of solvent:monomer (AM):crosslinking agent (MBAM) 100:15:0.5, and adjust its pH value to 8 with ammonia water. Then, according to the solid content of 40% (mass fraction), the alumina fiber: the nano-alumina powder mass ratio of 20:80, the nano-alumina powder and the alumina fiber are weighed. Put the nano-alumina powder, dispersant (SDS) and premix solution into a ball mill for 90 minutes and then add alumina fiber to continue the ball mill for 15 minutes. Weigh the foaming agent (hydrogen peroxide) and foam stabilizer (polyvinyl alcohol) according to the mass fraction of 3% and 0.5%, add them to the suspension in sequence, and stir at 40°C for 2 minutes to obtain a highly foamed slurry. Add the initiator (APS) and catalyst (TEMED) into the foaming slurry, stir for 2 minutes, and then pour it into a mold of a specific size to make it solid...

Embodiment 3

[0048] First prepare the solvent according to the absolute ethanol:water ratio of 7:3, then prepare the premix according to the mass ratio of solvent:monomer (AM):crosslinking agent (MBAM) 100:15:0.5, and adjust its pH value to 8 with ammonia water. Then, according to the solid content of 30% (mass fraction), the alumina fiber: nano-alumina powder mass ratio of 10:90, the nano-alumina powder and the alumina fiber were weighed. Put the nano-alumina powder, dispersant (SDS) and premix solution into a ball mill for 90 minutes and then add alumina fiber to continue the ball mill for 15 minutes. Weigh the foaming agent (hydrogen peroxide) and foam stabilizer (polyvinyl alcohol) according to the mass fraction of 3% and 0.5%, add them to the suspension in sequence, and stir at 40°C for 2 minutes to obtain a highly foamed slurry. Add the initiator (APS) and catalyst (TEMED) into the foaming slurry, stir for 2 minutes, and then pour it into a mold of a specific size to make it solidify...

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Abstract

The invention belongs to the field of foam ceramic, and particularly relates to an alumina fiber-enhanced nano-alumina foam ceramic and a preparation method thereof. The alumina fiber-enhanced nano-alumina foam ceramic comprises the following raw materials: a nanometer aluminum oxide powder, a premix solution, a dispersing agent, aluminum oxide fiber, a foaming agent, an initiator and a catalyst, wherein premix solution is formed by adding a monomer and a crosslinking agent into an alcohol-water mixed solution; and the mass ratio of the alumina fiber to nano-alumina powder is (5-30): (95-70). By adopting the alcohol-water mixed solution as a solvent for gel casting, the surface tension among particles can be reduced, and the quality of dry blanks can be increased; the compressive strength of the finished product is more than 30MPa, the porosity is more than 50%, the volume density is less than 3g/cm<3>; the usage temperature is 1500-1750DEG C, the alumina fiber-enhanced nano-alumina foam ceramic is a lightweight and high temperature-resistant refractory material, and can be used in the field of lining materials of a high-temperature electric resistance furnace. The invention further provides a preparation method of the alumina fiber-enhanced nano-alumina foam ceramic, thus being suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of foam ceramics, and in particular relates to alumina fiber reinforced nano-alumina foam ceramics and a preparation method thereof. Background technique [0002] At present, the lining materials of high-temperature furnaces such as industrial electric furnaces and kilns at home and abroad are usually castables, refractory bricks or ceramic fiber products. Most of the castables are alkaline materials, and their strength will be significantly reduced after being corroded by the atmosphere in the furnace, which will easily lead to deformation and cracking of the lining. Due to the dense structure, large heat capacity and high thermal conductivity of refractory bricks, the heat loss is large and the energy saving rate is low. Ceramic fiber products have a good energy-saving effect, but their ability to resist air erosion is weak, and the fibers are easy to fall off. The above-mentioned furnace lining materials have pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10C04B38/02
CPCC04B35/10C04B35/66C04B38/02C04B2235/5224C04B2235/602C04B2235/606C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9615
Inventor 卢志华马育栋孙伟王文轩
Owner JINING UNIV
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