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Aluminum oxide hollow sphere light insulating brick and preparation method thereof

A technology of aluminum oxide hollow spheres and lightweight heat insulation, which is applied to ceramic products, other household appliances, applications, etc., can solve the problems of affecting the service life of lightweight bricks, poor thermal shock stability, and long calcination time, and achieve heat insulation The effect is good, the strength is improved, and the effect of improving the thermal shock stability

Active Publication Date: 2011-08-31
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lightweight insulation brick system prepared by this method is too simple, only alumina hollow spheres and α-Al 2 o 3 Fine powder, pure corundum phase is difficult to sinter at high temperature, so high calcination temperature and long calcination time are required, resulting in high product cost; the light weight of this kind of lightweight brick mainly depends on the introduction of aluminum oxide hollow balls Large pores, the matrix part is still in a dense state, heat can be freely transmitted in the matrix part, and the thermal shock stability is poor, so the matrix part is prone to stress concentration and cracking during use, which affects the service life of lightweight bricks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] An aluminum oxide hollow sphere lightweight heat-insulating brick and a preparation method thereof. First, 45-50wt% aluminum oxide hollow spheres, 40-45wt% Al 2 o 3 Micropowder, 6-8wt% ρ-Al 2 o 3 mixed with 3-4wt% silicon micropowder, plus 5-10wt% organic polymer fine powder and 20-25wt% water of the above-mentioned mixture, stirred evenly, and poured; then maintained at room temperature for 24-30h, After demolding, dry at 100-120°C for 20-36 hours, and finally keep warm at 1600-1650°C for 3-6 hours.

[0017] In this embodiment: the organic polymer fine powder is distiller's grains; the particle gradation of the alumina hollow spheres is: 25-30 wt% for particles of 5-3 mm, 40-50 wt % for particles of 3-1 mm, and 40-50 wt % for particles of 1-0.2 mm Particles are 23-33 wt%.

[0018] The bulk density of the alumina lightweight bricks prepared in this example is 1.30-1.70g / cm 3 , The compressive strength is 16~25MPa, and the thermal conductivity is 0.23~0.60W / (m·K). ...

Embodiment 2

[0020] An aluminum oxide hollow sphere lightweight heat-insulating brick and a preparation method thereof. First, 45-50wt% aluminum oxide hollow spheres, 37-43wt% Al 2 o 3 Micropowder, 7~12wt% ρ-Al 2 o 3 mixed with 4-5wt% silicon micropowder, plus 10-15wt% organic polymer fine powder and 23-27wt% water of the above-mentioned mixture, stirred evenly, and poured; then cured at room temperature for 24-36 hours, After demolding, dry at 100-120°C for 20-36 hours, and finally keep warm at 1650-1700°C for 3-6 hours.

[0021] In this embodiment: the fine powder of the organic polymer is starch; the particle gradation of the aluminum oxide hollow spheres is: 30-35 wt% for particles of 5-3 mm, 35-45 wt % for particles of 3-1 mm, and 35-45 wt % for particles of 1-0.2 mm Particles are 22-33wt%;

[0022] The bulk density of the alumina lightweight bricks prepared in this example is 1.20~1.60g / cm 3 , The compressive strength is 15~25MPa, and the thermal conductivity is 0.22~0.60W / (m·K...

Embodiment 3

[0024] An aluminum oxide hollow sphere lightweight heat-insulating brick and a preparation method thereof. First, 45-50wt% aluminum oxide hollow spheres, 40-45wt% Al 2 o 3 Micropowder, 6-8wt% ρ-Al 2 o 3 mixed with 3-5wt% silicon micropowder, plus 8-12wt% organic polymer fine powder and 21-26wt% water of the above-mentioned mixture, stirred evenly, and poured; then cured at room temperature for 24-48h, After demolding, dry at 100-120°C for 20-36 hours, and finally keep warm at 1600-1650°C for 3-6 hours.

[0025] In this embodiment: the organic polymer fine powder is dextrin; the particle gradation of alumina hollow spheres is: 28-33wt% for particles of 5-3mm, 38-45wt% for particles of 3-1mm, and 38-45wt% for particles of 1-0.2mm The particles are 25~33wt%.

[0026] The volume density of the alumina lightweight bricks prepared in this example is 1.10~1.58g / cm 3 , The compressive strength is 12~18MPa, and the thermal conductivity is 0.20~0.50W / (m·K).

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Abstract

The invention relates to an aluminum oxide hollow sphere light insulating brick and a preparation method thereof. The technical scheme of the method comprises the steps of mixing 45-55wt% of aluminum oxide hollow sphere, 30-45wt% of Al2O3 micro powder, 6-13wt% of Rho-Al2O3 micro powder with 3-6wt% of silicon micro powder, additionally adding 5-15wt% of organic polymer fine powder and 20-30wt% of water according to the weight percentage of the mixture, evenly stirring, and molding in a pouring way, maintaining for 24-48h under the condition of room temperature, demolding, drying for 20-36h under the condition of the temperature being 100-120DEG C, and keeping the temperature under the condition of 1600-1700DEG C. The method is simple in technology and low in cost. The aluminum oxide hollowsphere light insulating brick prepared by the method is characterized by being low in volume density, low in heat conductivity, high in compression strength, high in use temperature, good in insulating effect, high in load softening temperature, and low in heavy firing line change rate.

Description

technical field [0001] The invention belongs to the technical field of lightweight heat-insulating bricks, and in particular relates to a lightweight heat-insulating brick with alumina hollow balls and a preparation method thereof. Background technique [0002] Low-carbon environmental protection and energy saving and consumption reduction are one of the important measures for my country to maintain steady economic development. Thermal insulation is one of the important measures for energy saving. Lightweight refractory materials are the key parts of thermal equipment such as various kilns and have a great relationship. Develop light-weight, high-strength, high refractoriness, low thermal conductivity, good thermal shock stability, high load softening point, and even light-weight heat-insulating refractory materials that can directly contact flames, so as to change the traditional high-temperature kiln. The material has the disadvantages of large heat capacity, slow heating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/10C04B35/622
Inventor 顾华志方义能黄奥张美杰董西岳
Owner WUHAN UNIV OF SCI & TECH
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