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Low-cost light mullite-based heat preservation material and preparation method thereof

A mullite-based, thermal insulation technology, applied in ceramic products, other household appliances, applications, etc., can solve the problems of high cost, high process conditions, high sintering temperature, achieve strong mechanical strength, simple preparation process, reduce Effect of sintering temperature

Inactive Publication Date: 2015-04-08
INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the raw materials of mullite thermal insulation materials are mainly industrial mullite powder or alumina and silica, and the final sintering temperature in the sintering process is generally high (greater than 1300 ° C), resulting in high cost and high process conditions.

Method used

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  • Low-cost light mullite-based heat preservation material and preparation method thereof
  • Low-cost light mullite-based heat preservation material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Add 20g of fly ash and 30g of bauxite into water and stir, add 0.15g of foam stabilizer CMC and 0.25g of dispersant TAC, and ball mill for 24 hours to obtain primary slurry.

[0034] (2) Heat the primary slurry to 40°C in a water bath and mix it evenly with the gelatin solution (formed by dissolving gelatin in water at 40°C in advance) to obtain 143g of ceramic slurry with a gelatin content of 4wt% and a solid phase content of 35wt%;

[0035] (3) Add 0.43g foaming agent K12, and mechanically stir the slurry for 3 minutes at a rotating speed of 800 rpm to generate a large amount of foam and obtain a foam slurry;

[0036] (4) Pour the foam slurry into the mold, and solidify the gel at room temperature for 24 hours to obtain a wet billet;

[0037] (5) After the moisture on the surface of the wet billet is evaporated to dryness, the mold is demoulded, and it is naturally air-dried at room temperature for 2 days to obtain a green billet;

[0038] (6) Sinter the green bo...

Embodiment 2

[0043] (1) Add 20g of fly ash and 30g of bauxite into water and stir, add 0.25g of foam stabilizer CMC and 0.3g of dispersant TAC, and ball mill them for 24 hours to obtain primary slurry;

[0044](2) Heat the primary slurry to 40°C in a water bath and mix it evenly with the gelatin solution (formed by dissolving gelatin in water at 40°C in advance) to obtain 100g of a stable ceramic slurry with a gelatin content of 4wt% and a solid content of 50wt%. ;

[0045] (3) Add 0.3g foaming agent K12, and mechanically stir the slurry for 3 minutes at a rotational speed of 800 rpm to generate a large amount of foam and obtain a foam slurry;

[0046] (4) Pour the foam slurry into the mold, and solidify the gel at room temperature for 24 hours to obtain a wet billet;

[0047] (5) After the moisture on the surface of the wet billet is evaporated to dryness, the mold is demoulded, and it is air-dried at room temperature for 2 days to obtain a green billet;

[0048] (6) Sinter the green bo...

Embodiment 3

[0051] (1) Add 25g of fly ash and 25g of bauxite into water and stir, add 0.15g of foam stabilizer CMC, 0.25g of dispersant TAC and 2.5g of glass powder, and obtain primary slurry after ball milling for 20 hours;

[0052] (2) Heat the primary slurry to 45°C in a water bath and mix it evenly with the gelatin solution (formed by dissolving gelatin in water at 40°C in advance) to obtain 150g of a stable ceramic slurry with a gelatin content of 4wt% and a solid content of 35wt%. ;

[0053] (3) Add 0.45 g of foaming agent K12, and mechanically stir the slurry for 3 minutes at a rotational speed of 800 rpm to generate a large amount of foam to obtain a foam slurry;

[0054] (4) Pour the foam slurry into the mold, and solidify the gel at room temperature for 20 hours to obtain a wet billet;

[0055] (5) After the moisture on the surface of the wet billet is evaporated to dryness, the mold is demoulded, and it is air-dried at room temperature for 2 days to obtain a green billet;

[...

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Abstract

The invention provides a low-cost light mullite-based heat preservation material and a preparation method thereof. The method comprises the following steps: (1) adding pulverized fuel ash, bauxite, glass powder, a dispersing agent and a foam stabilizer into water for mixing, performing ball milling, thereby obtaining primary slurry; (2) adding an aqueous solution of gelatin, and stirring, thereby obtaining ceramic slurry; (3) adding a foaming agent, and stirring, thereby obtaining foam slurry; (4) pouring the foam slurry into a mold, and performing gel solidification at room temperature, thereby obtaining a wet green body; (5) demolding after moisture on the surface of the wet green body evaporates, and performing air drying, thereby obtaining a green body; and (6) sintering the green body in a high-temperature sintering furnace, thereby obtaining the mullite-based thermal insulation material. The industrial waste powder pulverized fuel ash and mineral bauxite are taken as main raw materials, a method for combining mechanical foaming and gelatin gel solidification molding is utilized, the cost is saved, and the environment is protected; and moreover, the prepared material has the advantages of low thermal conductivity, low specific gravity and high thermal stability and has the unique advantages of good creep resistance, erosion resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials, and in particular relates to a low-cost lightweight mullite-based thermal insulation material and a preparation method thereof. Background technique [0002] Porous ceramics are widely used in the preparation of filter membranes, catalyst supports, burners and insulation materials due to their excellent properties such as low thermal conductivity, low density, high porosity, high temperature resistance and corrosion resistance. my country's economy is now in a period of rapid development, and energy and environmental protection issues are becoming more and more prominent. Therefore, porous ceramics used as thermal insulation materials have great development and application prospects in daily life and production. [0003] Mullite is a classic ceramic material, which is the only stable crystalline phase in the aluminosilicate system under standard atmospheric pressure. It has...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B35/185C04B35/622
Inventor 龚伦伦程旭东陆松钱浩然李晔冯俊杰曹卫
Owner INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
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