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Preparation method of hard erosion resistant alumina fiberboard hearth material

An alumina fiber, corrosion-resistant technology, applied in the field of inorganic refractory materials, can solve the problems of large porosity and decreased refractory performance of fiberboard, and achieve the effect of prolonging life, increasing life and reducing porosity.

Active Publication Date: 2012-04-25
JIANGSU HIGH TECHNO THERMAL EQUIP CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because its structure is loose aggregates formed by the interweaving of alumina fibers, the porosity is large, and Na 2 O and other low melting point components are easy to diffuse and erode into the fiberboard through the fiber gap, resulting in a decrease in the overall fire resistance of the fiberboard

Method used

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  • Preparation method of hard erosion resistant alumina fiberboard hearth material
  • Preparation method of hard erosion resistant alumina fiberboard hearth material

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preparation example Construction

[0020] A kind of preparation method of hard erosion-resistant alumina fiberboard furnace material of the present invention comprises the following steps:

[0021] Step 1, chop the alumina fiber into a length of 2mm~5mm, and put it into the mixing tank; the alumina fiber (commercially available) refers to Al 2 o 3 Polycrystalline fibers with a content of 95% by weight;

[0022] Step 2. Add alumina micropowder to the alumina fiber, and stir to mix it fully with the alumina fiber; Alumina micropowder with a purity greater than 99%, the mass ratio of alumina fiber to alumina micropowder is 1: (0.5~1.5);

[0023] Step 3. Add the aqueous silica sol solution dropwise as a binder to the mixture of alumina fiber and alumina micropowder, and keep stirring while adding until thick mud is obtained. The concentration of the aqueous silica sol solution is 5wt%;

[0024] Step 4. Leave the mud to stand for a certain period of time, then pour it into the fiberboard forming mold, and contin...

Embodiment 1

[0031] Chopped the alumina fiber to a length of 2mm~5mm, weighed 10kg and put it into the mixing tank; according to the mass ratio of alumina fiber:alumina micropowder=1:1, mixed 10kg of alumina micropowder, stirred it with Alumina fibers are fully mixed evenly; add a concentration of 5wt% silica sol aqueous solution as a binder dropwise to the mixture of alumina fibers and alumina micropowder, and keep stirring while adding until thick mud is obtained; Leave the mud to stand for 4 hours, then pour it into the fiberboard forming mold, shake the mold continuously on the vibration table for 20 minutes, so that the air bubbles inside the wet fiberboard blank can be discharged, and then flatten the upper surface of the wet blank; leave the wet fiberboard blank for molding In the mold, after drying naturally at room temperature, open the mold, take out the solidified and shaped fiberboard body, and place it in an oven at 110°C for 8 hours until the fiberboard is completely dry and h...

Embodiment 2

[0033]Chopped the alumina fiber to a length of 2mm~5mm, weighed 10kg and put it into the mixing tank; according to the mass ratio of alumina fiber:alumina micropowder=1:0.5, mixed 5kg of alumina micropowder, stirred it with Alumina fibers are fully mixed evenly; add a concentration of 5wt% silica sol aqueous solution as a binder dropwise to the mixture of alumina fibers and alumina micropowder, and keep stirring while adding until thick mud is obtained; Leave the mud to stand for 2 hours, then pour it into the fiberboard forming mold, shake the mold continuously on the vibration table for 10 minutes, so that the air bubbles inside the wet fiberboard blank can be discharged, and then flatten the upper surface of the wet blank; leave the wet fiberboard blank for molding In the mold, after drying naturally at room temperature, open the mold, take out the solidified and shaped fiberboard body, and place it in an oven at 120 ° C for 6 hours until the fiberboard is completely dry and...

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Abstract

The invention relates to a preparation method of a hard erosion resistant alumina fiberboard hearth material. Directed at the existing problems of loose structure, no resistance to high temperature and erosion, and short service life during application of current alumina fiberboards as high temperature electric furnace hearth materials, the invention adds a lot of alumina micropowder into aluminafibers and adds a silica sol as a binder. The materials are mixed into mud, which is then poured into a die for moulding. After natural air drying, drying, cutting processing and high temperature calcining, an erosion resistant, bending resistant, hard and high strength alumina fiberboard hearth material can be obtained. Used as a high temperature electric furnace hearth material, the hard erosion resistant alumina fiberboard hearth material of the invention can have a service life improved by over 6 times.

Description

technical field [0001] The invention belongs to the field of inorganic refractory materials, in particular to a method for preparing a hard corrosion-resistant alumina fiber board furnace material. Background technique [0002] Alumina fiberboard is a hard product made of 95% polycrystalline alumina fiber loose cotton as raw material and formed by wet vacuum suction filtration. It has high temperature resistance, good heat insulation, and light specific gravity (0.4~0.6g / cm 3 ), small heat capacity, easy processing and cutting, and other excellent properties. It has the advantages of good heat insulation effect and low heat storage when used as a high-temperature electric furnace furnace material. The maximum operating temperature of the electric furnace can reach 1600 ° C. , the energy-saving effect is remarkable, and the temperature rises and falls rapidly, so it is widely used in the heat treatment and sintering of fine alumina ceramic products (such as 99 porcelain and 9...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 刘和义季骅高文秀丘晓文陈炎裴石光刘贵双刘金强
Owner JIANGSU HIGH TECHNO THERMAL EQUIP CO LTD
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