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Super-light aluminum oxide foam ceramic and preparation method thereof

A technology of foam ceramics and light alumina, which is applied in the field of foam ceramics, can solve problems such as poor porosity distribution uniformity, small cracks in products, and generation of toxic gases, and achieve the effects of no cracks in strength, high porosity, and uniform composition

Active Publication Date: 2015-01-28
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these technologies have certain advantages, they also have the following disadvantages: (1) The basic process of preparation includes pulping, slurrying, drying and sintering, etc., and the preparation process is complicated; (2) The size and porosity of the pores mainly depend on Regarding the foam precursor itself, when the pore size of the foam precursor is large, the edge or edge of the hole is brittle and the strength of the product is not high; when the pore size of the foam precursor is small, the slurry may block some small holes and affect the opening effect. Mostly in the slurry hanging process, there may be less slurry in the middle and more slurry in the surrounding area, resulting in poor porosity distribution uniformity; (3) The product is prone to small cracks or even cracks; (4) Toxic gas is generated during the sintering stage, polluted environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An ultra-light alumina foam ceramic and a preparation method thereof. Using fructose and industrial alumina fine powder as raw materials, wherein the mass ratio of fructose: industrial alumina fine powder is 1: (0.4~0.6), plus 0.1~0.3wt% of the raw material TiO 2 Finely powdered, mixed evenly to obtain a mixture. Then raise the temperature of the mixture to 100-120°C and keep it warm for 1-3h to obtain industrial alumina fine powder and TiO 2 A dispersion system in which micropowder is dispersed in sugar melt. Then the dispersion system is foamed and solidified at a constant temperature of 120-150°C for 8-15 hours, and the solidified green body is heated to 1400-1500°C and kept for 3-5 hours to obtain ultra-light alumina foam ceramics.

[0021] The ultra-light alumina foam ceramics prepared in this example: the bulk density is 0.15~0.26g / cm 3 ; The compressive strength reaches 1.30~2.0Mpa; the apparent porosity is 93~97%.

Embodiment 2

[0023] An ultra-light alumina foam ceramic and a preparation method thereof. with sucrose and α-Al 2 o 3 Fine powder is used as raw material, among which, sucrose: α-Al 2 o 3 The mass ratio of the fine powder is 1:(0.6~0.8), and 0.1~0.3wt% MgO micropowder of the raw material is added, mixed evenly to obtain a mixture. Then the mixture is heated to 180~200°C and kept for 1~3h to obtain α-Al 2 o 3 A dispersion system in which fine powder and MgO fine powder are dispersed in sugar melt. Then the dispersion system is foamed and solidified at a constant temperature of 150-180°C for 15-20 hours, and the solidified green body is heated to 1400-1500°C and kept for 3-5 hours to obtain ultra-light alumina foam ceramics.

[0024] The ultra-light alumina foam ceramics prepared in this embodiment: the bulk density is 0.22 ~ 0.34g / cm 3 ; The compressive strength reaches 1.55~2.50Mpa; the apparent porosity is 91~94%.

Embodiment 3

[0026] An ultra-light alumina foam ceramic and a preparation method thereof. Using glucose and white corundum fine powder as raw materials, wherein the mass ratio of glucose: white corundum fine powder is 1: (0.8~1.0), plus 0.1~0.3wt% Cr of the raw material 2 o 3 Finely powdered, mixed evenly to obtain a mixture. Then the mixture is heated to 150~180°C and kept for 1~3h to obtain white corundum fine powder and Cr 2 o 3 A dispersion system in which micropowder is dispersed in sugar melt. Then foam and solidify the dispersion system at a constant temperature of 150-180°C for 10-15 hours, raise the temperature of the solidified green body to 1400-1500°C, and keep it warm for 5-7 hours to prepare ultra-light alumina foam ceramics.

[0027] The ultra-light alumina foam ceramics prepared in this embodiment: the bulk density is 0.28 ~ 0.38g / cm 3 ; The compressive strength reaches 1.95~2.85Mpa; the apparent porosity is 90~92%.

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Abstract

The invention relates to super-light aluminum oxide foam ceramic and a preparation method thereof. According to the technical scheme, sugar and aluminum oxide fine powder are used as raw materials, wherein the mass ratio of the sugar to the aluminum oxide fine powder is 1 to (0.4-1.6); and a combustion-supporting agent which is 0.1wt%-0.5wt% of the raw materials is additionally added and then is uniformly mixed with the raw materials to obtain a mixture; the mixture is heated to 100-200 DEG C and the heat is preserved for 1-3 hours to obtain a dispersion system in which the aluminum oxide fine powder and the combustion-supporting agent are dissolved into a sugar solution; then the dispersion system is foamed and cured for 8-25 hours under a continuous temperature condition of 120-180 DEG C; and a cured blank is heated to 1400-1600 DEG C and the heat preservation is performed for 3-9 hours to obtain the super-light aluminum oxide foam ceramic. The preparation method has a simple process and is environmentally friendly; and the product has low volume density, high porosity and high strength and has no cracks.

Description

technical field [0001] The invention belongs to the technical field of foam ceramics. In particular, it relates to an ultra-light alumina foam ceramic and a preparation method thereof. Background technique [0002] Foam ceramics is a kind of foam-like porous ceramics in shape. It is the third generation of porous ceramic products developed after ordinary porous ceramics and honeycomb porous ceramics. Ceramic foam is a new type of industrial ceramic product with low bulk density, high porosity, and interconnected labyrinth-like three-dimensional network skeleton. It has corrosion resistance, good heat insulation performance, high temperature resistance, high permeability, and high specific surface area. And complex pore structure and other characteristics, these characteristics make it widely used in metallurgy, chemical industry, machinery, environmental protection and other industries, such as high-temperature gas purifiers, solid filters for diesel engine emissions, molt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/10C04B35/622
Inventor 李远兵黄柯柯徐娜娜李淑静廖佳李亚伟桑绍柏
Owner WUHAN UNIV OF SCI & TECH
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