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Porous oxide ceramic heat insulating material for kilns and preparation method of porous oxide ceramic heat insulating material

A technology of porous oxide and thermal insulation materials, applied in the preparation of porous aluminum silicate, mullite and alumina ceramic kiln thermal insulation materials), in the field of porous oxide ceramic kiln thermal insulation materials, which can solve the uneven internal structure of fiber materials High temperature strength, thermal insulation performance, low bulk density and simple process are achieved

Inactive Publication Date: 2013-04-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: in order to overcome the complex preparation process and high cost of the above-mentioned existing various ceramic fibers, and the inhomogeneity of the internal structure of the fiber material, resulting in low radiation rate and large energy consumption under high temperature, and long service life. Short and other problems, provide a method for preparing porous oxide ceramic kiln insulation materials of different materials

Method used

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  • Porous oxide ceramic heat insulating material for kilns and preparation method of porous oxide ceramic heat insulating material
  • Porous oxide ceramic heat insulating material for kilns and preparation method of porous oxide ceramic heat insulating material
  • Porous oxide ceramic heat insulating material for kilns and preparation method of porous oxide ceramic heat insulating material

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Experimental program
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preparation example Construction

[0034] (1) Preparation of ceramic slurry:

[0035] The mixture of raw materials that meet the requirements of porous aluminum silicate, mullite or alumina ceramic kiln insulation materials is 75~80% (weight percentage, the same below), plus 0.3~0.5% of dispersant and 20~ of deionized water. 25% was put into a ball mill jar, and each ceramic slurry was obtained after ball milling. Among them: the raw material powder of porous aluminum silicate ceramic kiln insulation material is composed of 15~20% of kaolin, 55~65% of bauxite, and 15~20% of silicon micropowder; the raw material powder of porous mullite ceramic kiln insulation material is composed of Kaolin 35~40%, bauxite 10~15%, alumina 50~55%, porous alumina ceramic kiln insulation material raw material powder is composed of alumina 90~95%, quartz 5~10%.

[0036] (2) Ceramic slurry foaming:

[0037] In each ceramic slurry prepared in step (1), according to the weight percentage of the ceramic slurry, add foaming agent 0.5-1...

Embodiment 1

[0042] Example 1: Porous aluminum silicate ceramic kiln insulation material

[0043] (1) Preparation of porous aluminum silicate ceramic slurry:

[0044] In the ball mill tank, the ceramic powder kaolin: bauxite: silica powder: dispersant (additional): deionized water is added in a ratio of 14g: 46g: 15g: 0.4g: 25g, and the ball mill is used for 24 hours to obtain the solid content. It is 75% aluminum silicate ceramic slurry.

[0045] (2) Ceramic slurry foaming:

[0046] Add 1g sodium lauryl sulfate, 3g PVA with a concentration of 8%, 1.5g metal aluminum powder and 4g agar to the above-mentioned aluminum silicate ceramic slurry, and then add 2g ammonia water to make the pH value of the aluminum silicate ceramic slurry 10; and placed in a 45 ° C water bath and stirred for 1.5h.

[0047] (3) In-situ injection molding:

[0048] The foamed aluminum silicate ceramic slurry is poured into the mold to cool, and solidify to form.

[0049] (4) Drying and firing:

[0050] The gree...

Embodiment 2

[0053] Example 2: Porous aluminum silicate ceramic kiln insulation material

[0054] (1) Preparation of aluminum silicate ceramic slurry:

[0055] Add ceramic powder kaolin: bauxite: silicon powder: dispersant (additional): deionized water to the ball mill tank at a ratio of 14g: 46g: 15g: 0.4g: 25g, and use a ball mill to mill for 24 hours to obtain the solid content It is 75% aluminum silicate ceramic slurry.

[0056] (2) Ceramic slurry foaming:

[0057] Add 1g of sodium lauryl sulfate, 6g of PVA with a concentration of 8%, 2g of metal aluminum powder and 4g of agar to the above-mentioned aluminum silicate ceramic slurry, and then add 2g of ammonia water to make the pH of the aluminum silicate ceramic slurry 10; and placed in a 50 ° C water bath and stirred for 1.5h.

[0058] (3) In-situ injection molding:

[0059] Pour the foamed aluminum silicate ceramic slurry into the mold to cool and solidify to form

[0060] (4) Drying and firing:

[0061] The green body obtained...

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Abstract

The invention discloses a porous oxide ceramic (aluminum silicate, mullite, alumina ceramics) prepared according to a foam in-situ consolidation method. Porous aluminum silicate, mullite, alumina ceramics each are made from the following raw materials: kaolin, bauxite, silicon micropowder, aluminum oxide and quartz, as well as a gas-generating agent (metal aluminum powder, rosin soap or sodium lauryl sulfate, polyvinyl alcohol or sodium carboxymethyl cellulose, agar), a foaming agent, a foam stabilizer and a forming agent. The porous oxide ceramic is prepared by the following steps: (1) preparation of ceramic slurry; (2) foaming of the slurry; (3) in-situ injection-consolidation forming of the slurry; and (4) drying and burning of formed blanks. The porous oxide ceramic heat insulating material has a uniform distribution of porosity and is good in heat-insulating effect and thermal shock resistance. According to the method, the process is simple, the cost is low, heat insulating materials for high-temperature kilns working in different temperatures (1200-1600 DEG C) can be produced, the heat insulating material product is not liable to chalking or cracking during long-term use, and the service life of the porous oxide ceramic heat insulating material is prolonged when compared with that of the existing kiln heat insulating material.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials for kilns, in particular to a preparation method for porous oxide ceramic kiln thermal insulation materials of different materials (such as porous aluminum silicate, mullite and alumina ceramic kiln thermal insulation materials). Background technique [0002] Thermal insulation materials for high-temperature kilns have gradually developed from expanded perlite, mineral wool, and glass wool to lightweight clay bricks and porous foam bricks, and further developed to oxide polycrystalline ceramic refractory fibers. Polycrystalline ceramic fiber has the characteristics of low thermal conductivity, good heat insulation and energy saving effect, and is widely used in industrial furnaces and high-temperature furnaces. [0003] Polycrystalline ceramic fiber kiln insulation materials can be divided into aluminum silicate fiber, mullite ceramic fiber, alumina ceramic polycrystalline fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/66
Inventor 王浩梅森王飞彭玲
Owner WUHAN UNIV OF TECH
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