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Preparation method of corundum/mullite light-weight heat insulating material

A lightweight thermal insulation, mullite technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of difficult sample preparation, low application value, long drying cycle, etc., to avoid sample cracking, Small drying shrinkage and the effect of lowering the sintering temperature

Active Publication Date: 2015-02-04
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the method described in the above literature is that it foams in silica sol, and only relies on nano-silica particles to surround the pores. Its drying cycle is long (over 30 days) and it is difficult to dry and easy to crack. Sample, practical application value is not high

Method used

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  • Preparation method of corundum/mullite light-weight heat insulating material
  • Preparation method of corundum/mullite light-weight heat insulating material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Aluminum oxide fine powder with an average particle size of 5.0 μm, deionized water with 15% of the quality of alumina fine powder, sodium ion-stabilized silica sol (SiO 2 The mass concentration is 30wt.% (produced by Zhejiang Shangyu Yuda Chemical Co., Ltd.), and 0.4% formamide of alumina micropowder is used for batching, and the pH value of the slurry is adjusted by ball mill mixing and ammonia water to obtain a slurry with pH = 9-10 . Transfer the slurry obtained by ball mill mixing to a mixing tank, add sodium lauryl sulfate with 5% free water quality in the slurry, and foam through mechanical stirring to obtain a foam slurry, and then add it to the foam slurry while stirring NH 4 Cl solution, control of NH in foam slurry 4 The concentration of Cl is 0.10mol / L, and the foam slurry after stirring is injected into the mold, and the foam slurry is quickly solidified and formed; after demoulding, the green body is first dried in a constant temperature and humidity box...

Embodiment 2

[0029] Aluminum oxide fine powder with an average particle size of 1.5 μm, deionized water with 15% of the quality of alumina fine powder, sodium ion-stabilized silica sol (SiO 2 The mass concentration is 30wt.% (produced by Zhejiang Shangyu Yuda Chemical Co., Ltd.), formamide with 0.6% alumina micropowder mass is used for batching, and the pH value of the slurry is adjusted by ball mill mixing and ammonia water to obtain a slurry with pH = 9-10 . Transfer the slurry obtained by ball mill mixing to a mixing tank, add sodium dodecylbenzene sulfonate with 10% free water mass in the slurry, and obtain foam slurry by mechanical stirring and foaming, and then stir in the foam slurry side join NH 4 Cl solution, control of NH in foam slurry 4The concentration of Cl is 0.08mol / L, and the foam slurry after stirring evenly is injected into the mold, and the foam slurry is quickly solidified and formed; after demolding, the green body is first dried in a constant temperature and humidi...

Embodiment 3

[0031] Aluminum oxide fine powder with an average particle size of 5.0 μm, deionized water with 10% mass of alumina fine powder, ammonium ion-stabilized silica sol (SiO 2 The mass concentration is 20wt.% (produced by Zhejiang Shangyu Yuda Chemical Co., Ltd.), ethylene glycol with a mass of 0.2% of alumina micropowder is used for batching, and the pH value of the slurry is adjusted by ball mill mixing and ammonia water to obtain a slurry with a pH of 9 to 10. material. Transfer the slurry obtained by ball mill mixing to a mixing tank, add ammonium lauryl sulfate with 8% free water quality in the slurry, and foam through mechanical stirring to obtain a foam slurry, and then add it to the foam slurry while stirring NH 4 Cl solution, control of NH in foam slurry 4 The concentration of Cl is 0.12mol / L, and the foam slurry after stirring is injected into the mold, and the foam slurry is quickly solidified and formed; after demoulding, the green body is first dried in a constant te...

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Abstract

The invention belongs to the technical field of heat insulating material preparation, and particularly relates to a preparation method of a corundum / mullite light-weight heat insulating material, which comprises the following steps: by using ceramic powder, silica sol, deionized water, ammonia water and dryness-control chemical additive as initial raw materials, carrying out ball milling to prepare a ceramic slurry; adding a foaming agent into the ceramic slurry, and foaming in a mechanical stirring mode to obtain a foam slurry; adding an NH4Cl solution into the foam slurry while stirring, injecting the uniformly stirred foam slurry into a mold, and quickly curing to form the foam slurry; and drying the demolded blank, and firing to obtain the corundum / mullite light-weight heat insulating material. The invention is characterized in that the gelation reaction of the silica sol is utilized to implement curing and formation of the foam slurry; meanwhile, the volume expansion generated by mullitization in the firing process is utilized to avoid sample cracking due to excessive sintering shrinkage; and in addition, the raw materials are nontoxic and cheap, and the preparation process is simple to control and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of light heat insulation materials, and in particular relates to a preparation method of corundum mullite light heat insulation materials. Background technique [0002] With the increasing depletion of energy, the country and enterprises have higher requirements for energy saving and consumption reduction in the production process. The use of lightweight insulation materials in thermal equipment such as industrial kilns and high-temperature electric furnaces is a simple and effective method that can significantly save energy and reduce consumption. Among them, the corundum-mullite composite lightweight thermal insulation material with corundum and mullite as the main crystal phase has the excellent characteristics of both materials, with high porosity, low thermal conductivity, excellent thermal shock resistance, It has the advantages of good high temperature resistance and small thermal expa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B35/66
Inventor 王刚曹贺辉李红霞袁波吴海波韩建燊
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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