Aluminum oxide-based foamed ceramic and preparation method thereof

A ceramic foam and alumina-based technology, which is applied in the field of ceramic foam, can solve problems such as damage to ceramic foam, no modification, complex production equipment requirements, etc., and achieve good thermal shock stability, high mechanical strength and simple process.

Active Publication Date: 2018-03-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its main defect is: (1) does not modify the cracks on the surface of hollow holes and ceramic substrates produced by polyurethane foam after burning out; (2) the production equipment requirements are relatively complicated by spraying and other processes; (3) calcining Alumina is not sintered at a lower temperature, resulting in low strength of alumina foam ceramics
But its main defects are: (1) Adding sintering agent reduces the high-temperature mechanical properties of alumina foam ceramics; (2) The defects caused by unmodified and burned-out polyurethane foam are easy to form stress concentration and cause oxidation under external influence. Damage of aluminum foam ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1. Add 0.0005 to 0.0008 parts of explosion-proof fiber, 0.3 to 2.1 parts of octanol, 0.3 to 1.7 parts of carboxymethyl cellulose, and 0.2 to 1.1 parts of hydroxy Propyl methylcellulose, 0.3-1 part by mass of polycarboxylate and 22-49 parts by mass of water, ball milled for 1-1.5 hours to prepare slurry I;

[0029] Step 2: Add 0.3 to 1.5 parts of octanol by mass, 0.1 to 0.5 parts by mass of carboxymethyl cellulose, 0.3 to 1 part by mass of polycarboxylate and 28 to 40 parts by mass of water, ball milled for 1-1.5 hours to obtain slurry II;

[0030] Step 3. Immerse the polyurethane sponge in the slurry I under vacuum conditions, blow the slurry with compressed air or centrifugally shake the slurry after immersion, dry it naturally for 12-24 hours, and then raise the temperature to 600-850°C at a rate of 0.5-2°C / min , keep warm for 1.5-2.5h to obtain the alumina-based foam ceramic preform; then immerse the alumina-based foam ceramic preform in the slurry II under vac...

Embodiment 2

[0034] An alumina-based foam ceramic and a preparation method thereof. The preparation method shown in this embodiment is the same as in Example 1 except step 2.

[0035] Step 2: Add 1.5 to 2.1 parts of octanol, 0.5 to 0.9 parts of carboxymethyl cellulose, 0.3 to 1 part of polycarboxylate and 40 to 55 parts of α-alumina to 100 parts of α-alumina water, ball milled for 1-1.5 hours to obtain slurry II;

[0036] The alumina-based foamed ceramics prepared in Example 2 have been tested: the compressive strength at room temperature is 3.1-4.7MPa; the number of water cooling cycles at 1100°C is 22-25 times; The compressive strength is 3.0-4.5MPa.

Embodiment 3

[0038] Step 1. Add 0.0008 to 0.0015 parts of explosion-proof fiber, 0.3 to 2.1 parts of octanol, 0.3 to 1.7 parts of carboxymethyl cellulose, and 0.2 to 1.1 parts of hydroxy Propyl methylcellulose, 0.3-1 part by mass of polycarboxylate and 22-49 parts by mass of water, ball milled for 1-1.5 hours to prepare slurry I;

[0039] Step 2: Add 0.3 to 1.5 parts of octanol by mass, 0.1 to 0.5 parts by mass of carboxymethyl cellulose, 0.3 to 1 part by mass of polycarboxylate and 28 to 40 parts by mass of water, ball milled for 1-1.5 hours to obtain slurry II;

[0040]Step 3. Immerse the polyurethane sponge in the slurry I under vacuum conditions, blow the slurry with compressed air or centrifugally shake the slurry after immersion, dry it naturally for 12-24 hours, and then raise the temperature to 600-850°C at a rate of 0.5-2°C / min , keep warm for 1.5-2.5h to obtain the alumina-based foam ceramic preform; then immerse the alumina-based foam ceramic preform in the slurry II under vacu...

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Abstract

The invention relates to an aluminum oxide-based foamed ceramic and a preparation method thereof. The preparation method comprises the following steps: firstly, uniformly mixing industrial aluminum oxide, anti-explosion fibers, octyl alcohol, carboxyl methyl cellulose, hydroxypropyl methyl cellulose, polycarboxylate and water, thus obtaining slurry I; uniformly mixing alpha-aluminum oxide, octyl alcohol, carboxyl methyl cellulose, polycarboxylate and water, thus obtaining slurry II; then impregnating polyester sponge into the slurry I under vacuum condition, carrying out compressed air injection or centrifugal slurry throwing, naturally drying, and carrying out heat preservation, thus obtaining an aluminum oxide-based foamed ceramic preform; and then carrying out vacuum impregnation on thealuminum oxide-based foamed ceramic preform, carrying out the compressed air injection or centrifugal slurry throwing, and naturally drying, thus obtaining an aluminum oxide-based foamed ceramic green body; and carrying out heat preservation under certain conditions, thus obtaining the aluminum oxide-based foamed ceramic. The preparation method provided by the invention has the characteristics ofsimple technology and low cost, and the prepared aluminum oxide-based foamed ceramic has high mechanical strength and good thermal shock resistance.

Description

technical field [0001] The invention relates to the technical field of foam ceramics, in particular to an alumina-based foam ceramic and a preparation method thereof. Background technique [0002] Foam ceramics prepared by organic foam impregnation method use polyurethane foam as a precursor, and impregnate ceramic slurry to obtain a porous material with high porosity and three-dimensional network structure. Due to its special structure, corrosion resistance and good mechanical properties, it is widely used in aerospace, refractory materials, catalysis and filtration and other fields. [0003] Alumina (Al 2 o 3 ) has a series of advantages such as high mechanical strength, high refractoriness, good corrosion resistance, excellent dielectric properties and oxidation resistance. Alumina foam ceramics is an important refractory material for metallurgical filtration and building insulation material. However, when preparing alumina-based foam ceramics, due to the decompositio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/71C04B35/10C04B35/622C04B38/06
CPCC04B35/10C04B35/622C04B35/71C04B38/067C04B2235/5436C04B2235/602C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6583
Inventor 贾文宝陈若愚黑大千汪瑜凡
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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