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Preparation method for mullite fiber porous thermal insulation material

A technology of mullite fiber and thermal insulation materials, applied in ceramic products, applications, household appliances, etc., to achieve the effects of simple process flow, low energy consumption, and controllable material density

Inactive Publication Date: 2016-11-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-density, high-specificity mullite fiber porous thermal insulation material with simple process and low cost to solve the disadvantages of the prior art that it is difficult to prepare a low-density, high-specificity mullite fiber porous thermal insulation material with controllable density. Method of strength mullite fiber porous insulation material

Method used

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  • Preparation method for mullite fiber porous thermal insulation material
  • Preparation method for mullite fiber porous thermal insulation material
  • Preparation method for mullite fiber porous thermal insulation material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Weigh mullite fiber and silica sol by the mass ratio of mullite fiber / silica sol=3.3, weigh agar powder by the mass ratio of agar powder / (silica sol+mullite fiber)=1:9 , mix agar powder and silica sol, set the density of the prepared mullite fiber porous material to be 0.2g / cm 3 , to which distilled water was added to a volume of 5M cm 3 (M is the total mass of the weighed mullite fiber, silica sol, and agar powder), heated in a water bath at 78°C and stirred evenly to obtain a mixed solution of silica sol and agar powder;

[0024] (2) Slowly add mullite fiber to the mixed solution of silica sol and agar powder obtained in step (1) under the condition of heating in a water bath at 78°C, and magnetically stir while adding mullite fiber, so that the mullite fiber Can be evenly dispersed in the mixed solution of silica sol and agar powder;

[0025] (3) Pour the mixed solution of evenly mixed mullite fiber, silica sol, and agar powder into a plastic beaker, and put th...

Embodiment 2

[0030] (1) Weigh mullite fiber and silica sol by the mass ratio of mullite fiber / silica sol=1.67, weigh agar powder by the mass ratio of agar powder / (silica sol+mullite fiber)=1:9 , mix agar powder and silica sol, set the density of the prepared mullite fiber porous material to be 0.2g / cm 3 , to which distilled water was added to a volume of 5M cm 3 (M is the total mass of the weighed mullite fiber, silica sol, and agar powder), heated in a water bath at 78°C and stirred evenly to obtain a mixed solution of silica sol and agar powder;

[0031] (2) Slowly add the mullite fiber to the mixed solution of silica sol and agar powder obtained in step (1) under the condition of heating in a water bath at 78°C, and stir magnetically while adding the fiber, so that the mullite fiber can be evenly dispersed In the mixed solution of silica sol and agar powder;

[0032] (3) Pour the mixed solution of evenly mixed mullite fiber, silica sol, and agar powder into a plastic beaker, and put t...

Embodiment 3

[0036] (1) weigh mullite fiber and silica sol (by the mass ratio of mullite fiber / silica sol=6.67, weigh agar by the mass ratio of agar powder / (silica sol+mullite fiber)=1:9 powder, agar powder and silica sol are mixed, and the density of the prepared mullite fiber porous material is set to be 0.2g / cm 3 , to which distilled water was added to a volume of 5M cm3 (M is the total mass of the weighed mullite fiber, silica sol, and agar powder), heated in a water bath at 78°C and stirred evenly to obtain a mixed solution of silica sol and agar powder;

[0037] (2) Slowly add the mullite fiber to the mixed solution of silica sol and agar powder obtained in step (1) under the condition of heating in a water bath at 78°C, and stir magnetically while adding the fiber, so that the mullite fiber can be evenly dispersed In the mixed solution of silica sol and agar powder;

[0038] (3) Pour the mixed solution of evenly mixed mullite fiber, silica sol, and agar powder into a plastic beaker...

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Abstract

The invention discloses a preparation method of a mullite fiber porous heat insulating material. The invention discloses a method for preparing a mullite fiber porous material by combining gel casting into a film and freeze-drying. The process is: first mix silica sol and agar powder, add deionized water to dilute and stir evenly under the condition of heating in a water bath at 78°C, then slowly add mullite fiber to the uniform mixture of silica sol and agar powder, and stir while adding , so that the mullite fiber is evenly dispersed in the sol; after stirring evenly, pour the obtained sol into a plastic beaker, put it in a 15°C water bath environment for gel treatment for 60s, and then freeze it at -196°C, and then put it into Drying in a freeze dryer; finally, heat-treating the dried body at 1500° C. for 2 hours to obtain a mullite fiber porous material. The invention has simple process and low energy consumption, and realizes the purpose of controlling the density of the prepared mullite fiber porous material, and prepares the mullite fiber porous material with low density and high specific strength.

Description

technical field [0001] The invention relates to a mullite fiber porous heat insulating material, in particular to a simple and economical method for preparing the mullite fiber porous heat insulating material by gel injection molding-freeze drying. Background technique [0002] Mullite material has good high temperature resistance, high temperature creep resistance, thermal shock resistance, and good mechanical properties, but also has high chemical stability, low true density and good dielectric properties performance. Mullite fiber has the excellent properties of mullite material, and is widely used in the lining insulation of high-temperature industrial kilns and other thermal equipment in the fields of metallurgy, machinery, ceramics, electronics, petrochemicals, and aerospace. It can achieve the purpose of saving energy and increasing production, reducing the temperature difference in the furnace, improving product quality, reducing spare parts consumption, prolonging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/185C04B35/624C04B35/622C04B35/636C04B35/63
CPCC04B38/0045C04B35/185C04B35/622C04B35/624C04B35/6316C04B35/636C04B2235/96
Inventor 侯峰王鑫
Owner TIANJIN UNIV
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