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Aluminum oxide light thermal insulation material and preparation method thereof

A lightweight thermal insulation, alumina technology, applied in ceramic products, other household appliances, applications, etc., can solve the problems of unfavorable industrial promotion, poor green strength, toxicity, etc., and achieve easy industrial production and high green strength. , the effect of high porosity

Inactive Publication Date: 2020-03-31
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent "Alumina Lightweight Heat Insulation Brick and Its Preparation Method" with application number 201711078161.2 also discloses a preparation method of alumina light weight heat insulation brick. The disadvantage of the foam method is that the strength of the green body is poor, which is not conducive to industrial promotion
The gel injection molding method is to add organic monomers, cross-linking agents, catalysts, etc. Organic monomers, cross-linking agents, etc. are generally toxic and harmful to human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] ρ-Al with a particle size of 3um 2 o 3 Micro powder as the main raw material, plus 1wt% TiO 2 Micropowder, 1wt% andalusite, mixed for 5 minutes to obtain a mixture; add an appropriate amount of water to the mixture, the quality of water is 100wt% of the mixture, stir for 3 minutes, cast and solidify for 1 hour to obtain a green body ; Put the green body in an oven at 100°C to dry for 6 hours; keep the dried green body at 1550°C for 4 hours to obtain an aluminum oxide lightweight heat insulating material.

[0020] The bulk density of the aluminum oxide lightweight heat insulating material prepared in Example 1 is 1.0 g / cm 3 , the thermal conductivity is 0.3w / (m.k), and the compressive strength reaches 5Mpa.

Embodiment 2

[0022] ρ-Al with a particle size of 1um 2 o 3 Micropowder is the main raw material, plus 2wt% MgO micropowder and 8wt% kyanite, mix for 7 minutes to obtain a mixture; add an appropriate amount of water to the mixture, the quality of water is 50wt% of the mixture quality, and stir for 4 minutes , pouring molding, curing for 2 hours to obtain a green body; put the green body in an oven at 120°C for 8 hours and dry it for 8 hours; keep the dried green body at 1400°C for 6 hours to obtain an alumina lightweight heat insulating material.

[0023] The bulk density of the aluminum oxide lightweight heat insulating material prepared in Example 2 is 1.2 g / cm 3 , the thermal conductivity is 0.5w / (m.k), and the compressive strength reaches 10Mpa.

Embodiment 3

[0025] ρ-Al with a particle size of 5um 2 o 3 Micropowder is the main raw material, add 0.1wt% boric acid and 5wt% sillimanite, mix for 8 minutes to obtain a mixture; add an appropriate amount of water to the mixture, the quality of water is 150wt% of the mixture quality, and stir for 5 minutes , pouring molding, curing for 4 hours to obtain a green body; put the green body in an oven at 100°C and dry for 6 hours; keep the dried green body at 1600°C for 8 hours to obtain an alumina lightweight heat insulating material.

[0026] The bulk density of the aluminum oxide lightweight heat insulating material prepared in Example 3 is 0.8 g / cm 3 , the thermal conductivity is 0.3w / (m.k), and the compressive strength reaches 6Mpa.

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Abstract

The invention discloses an aluminum oxide light thermal insulation material and a preparation method thereof. The preparation method comprises the following steps: (1) proportioning rho-Al2O3 micro powder, a sintering aid, an expanding agent and the like according to a certain ratio, and uniformly mixing; (2) adding a proper amount of water into the raw materials, uniformly stirring, pouring an obtained mixture into a corresponding mold, and curing and molding to form a green body; (3) putting the green body into a drying oven for drying; and (4) calcining the dried green body at a high temperature to obtain the aluminum oxide light thermal insulation material. The method has the advantages of environmental friendliness, high green body strength, simple process and easiness in industrial production; the prepared aluminum oxide light thermal insulation material is small in volume density and low in thermal conductivity.

Description

technical field [0001] The invention belongs to the technical field of light heat insulation materials, and in particular relates to an aluminum oxide light heat insulation material and a preparation method thereof. Background technique [0002] Lightweight insulation material is a material with a large number of penetrating and non-penetrating three-dimensional porous structures. It generally has the following characteristics: good chemical stability, high porosity, and low thermal conductivity. It is mainly used in industrial kilns as an insulation layer to build kilns, thereby reducing heat consumption and increasing heat storage capacity. Alumina lightweight heat insulation material is a refractory material with low density, high strength and low thermal conductivity. Compared with ordinary heat insulation materials, it has the characteristics of high softening temperature under load. , good thermal insulation properties, is an ideal lining material for high temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B38/10
CPCC04B35/10C04B35/622C04B38/10C04B2235/3206C04B2235/3232C04B2235/3267C04B2235/3409C04B2235/3463C04B2235/5436C04B2235/6022C04B2235/606C04B2235/656C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607
Inventor 李晓星李建忠张勇王锦张岩岩
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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