Method for preparing porous ceramic heat-insulating material by sol-gel method

A sol-gel method and porous ceramic technology, which is applied in the field of preparation of porous ceramic heat insulation materials, can solve the problems of great harm to the human body, easy pulverization, high thermal conductivity, etc., and meet the requirements of energy saving, small sintering shrinkage, and thermal conductivity low rate effect

Inactive Publication Date: 2016-08-24
王浩
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Problems solved by technology

The former itself consumes a lot of energy in the preparation process. Although the market price is relatively low, it has high density, high thermal conductivity, and general heat insulation ef

Method used

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Embodiment Construction

[0012] The present invention is illustrated below in conjunction with specific embodiments.

[0013] A method for preparing a porous ceramic heat insulating material via a sol-gel method, comprising the steps of:

[0014] 1) Al 2 o 3 Calcined to Al 2 o 3 99wt% powder, Al 2 o 3 The particle diameter of the powder is 1.4μm, take 100g Al 2 o 3 powder, 80g chemically pure ammonium citrate, 100ml deionized water and Al 2 o 3 Put the balls together in a stirring mill and mill for 1 h, and the Al 2 o 3 Grinding balls filter out to obtain Al with a mass fraction of 75% 2 o 3 slurry;

[0015] 2) to Al 2 o 3 Add 20ml of silica sol with a mass fraction of 20% and 25ml of industrially pure triethanolamine dodecylsulfate to the slurry. After the volume expands, add 10g of chemically pure ammonium chloride and stir for 30s;

[0016] 3) After the gel reaction occurs, quickly inject it into the mold, and remove the mold after the green body is solidified;

[0017] 4) The gree...

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Abstract

The invention discloses a method for preparing a porous ceramic heat-insulating material by a sol-gel method and belongs to the technical field of heat insulating materials. The method comprises the following steps: calcining Al2O3 so as to obtain powder, in which the content of Al2O3 is 99wt%, putting 100g of Al2O3 powder, 80g of ammonium citrate, 100ml of deionized water and Al2O3 milling balls into a stirring mill together, carrying out ball milling for 1 hour, and filtering out the Al2O3 milling balls, so as to obtain Al2O3 slurry with the mass percent of 75%; adding 20ml of silica sol and 25ml of triethanolamine lauryl sulfate into the Al2O3 slurry, adding 10g of ammonium chloride into the Al2O3 slurry until volume expansion is achieved, and carrying out stirring for 30 seconds; after a gel reaction, injecting the reaction product into a mold rapidly, and carrying out demolding after a blank is cured; and transferring the blank to a thermo-hygrostat and an air-blast drying oven for curing and drying, and carrying out sintering on the dried blank in a sintering furnace at the temperature of 1,500 DEG C to 2,000 DEG C while carrying out heat preservation for 2 to 4 hours. The heat-insulating material prepared by the method has the advantages of high strength, low density and low thermal conductivity.

Description

technical field [0001] The invention belongs to the technical field of heat insulating materials, and in particular relates to a preparation method of a porous ceramic heat insulating material. Background technique [0002] In the prior art, the heat insulation material used in high temperature industry is mainly Al 2 o 3 Hollow sphere products and Al 2 o 3 fiber products. The former itself consumes a lot of energy in the preparation process. Although the market price is relatively low, it has high density, high thermal conductivity, and general heat insulation effect; the latter has low density and low thermal conductivity, but has low strength and is easy to powder. Chemical, not resistant to erosion, greater harm to the human body and other shortcomings. Therefore, in response to the energy-saving and consumption-reducing requirements of high-temperature industrial development, there is an urgent need for a new type of thermal insulation material with high strength, ...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B35/10C04B35/624
Inventor 王浩
Owner 王浩
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