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Method for preparing foamed ceramics based on nano-alumina

A technology of nano-alumina and foamed ceramics, which is applied in the field of foamed ceramics preparation, can solve the problems of high preparation cost, difficult to deal with halogen pollutants, difficult to light refractory bricks and ceramic fibers, etc., and achieves low cost, simple equipment and process. , the effect of easy large-scale industrial production

Active Publication Date: 2010-09-01
武汉吉耐德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method needs to use expensive AlCl 3 (Pr i 2 O) As a raw material, difficult-to-handle halogen pollutants will be produced during the sintering process, and the preparation cost is very high, so it is difficult to fully replace lightweight refractory bricks and ceramic fibers

Method used

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  • Method for preparing foamed ceramics based on nano-alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take by weighing 500g, the commercially available 99.9% nano-alumina that particle size is 30nm, take by weighing 400g deionized water, take by weighing 15g purity and be 99.5% propionic acid solution, pour in the ball mill jar of 5L, add and material volume 1: 1 For agate balls, make two identical ball milling jars according to this method, put the ball milling jars into a ball mill and grind and stir for 6 hours to form a stable suspension of particles; take out the suspension in each jar, filter the ball milling medium and place them separately, one of the jars , weigh the weight of the suspension to be 896g, add 900g of octane with a purity of 98% to the suspension, and form a microemulsion with an "oil-in-water" structure after fully stirring; inject the microemulsion into an internal size of 250mm*250mm* In a 50mm square mold, the frame of the mold is made of grid-shaped stainless steel, the bottom of the mold and the surrounding area are sewn flat with gauze, and ...

Embodiment 2

[0025] Same method as in Example 1 for the stable suspension of particles, take out another tank of suspension in Example 1, weigh the suspension weight to be 898g, add 400g of octane with a purity of 98% to the suspension, and fully stir Finally form the microemulsion of " oil in water " structure; This microemulsion is injected in the mold identical with embodiment 1, the microemulsion in the mold box adopts air-drying to form foamy sample after 10 days; After drying, put the sample together with the mold Sinter in a sintering furnace at 800°C for 8 hours to obtain nano-alumina foam ceramics with a certain strength; after that, take out the nano-alumina foam ceramics with a certain strength from the stainless steel mold and put them in a high-temperature sintering furnace at 1350°C for sintering After 8 hours, a high-strength ceramic foam was obtained with a bulk density of 0.22g / cm 3 .

[0026] Table 1 is the performance test report of the nano-alumina foamed ceramics obta...

Embodiment 3

[0031]Take by weighing 500g, the commercially available 99.9% nanometer aluminum oxide that particle size is 200nm, take by weighing 250g (250ml) deionized water, take by weighing 12g purity and be the valeric acid solution of 99.5%, pour in the ball mill tank of 5L, add and material volume 1: 1 agate balls, put the ball mill pot into the ball mill and grind and stir for 4 hours to form a stable suspension of particles; weigh the suspension weight to be 748g, add 150g of pentane with a purity of 98% in the suspension, Form the microemulsion of " oil in water " structure after fully stirring; Inject this microemulsion in the mold identical with embodiment 1, the microemulsion in the mold box is dried 10 days in the constant temperature room of controlling temperature at 50 ℃; After drying The sample connected to the mold was placed in a sintering furnace at 650°C for 8 hours to obtain nano-alumina foam ceramics with a certain strength; after that, the nano-alumina foam ceramics ...

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Abstract

The invention relates to a method for preparing foamed ceramics based on nano-alumina, which comprises the following steps of: mixing nano-alumina particles, de-ionized water and short-chain amphipathic organic molecular solution, placing the mixture into a mill pot and grinding and stirring the mixture to form suspension with stable particles; taking the suspension out, adding a water insoluble organic solvent like a hydrocarbon material in a certain proportion into the suspension and completely stirring the mixture to form micro-emulsion with an oil-in-water structure; injecting the micro-emulsion into a prepared stainless steel mould and drying the micro-emulsion for 10 to 15 days to form a foamed sample; and sintering the foamed sample in a sintering furnace of 650 to 900 DEG C for 2 to 8 hours to mold the foamed sample, taking the molded foamed sample out of the stainless steel mould, and placing the molded foamed sample into a high-temperature sintering furnace of 1,350 to 1,600 DEG C for sintering for 2 to 8 hours to obtain the high-strength nano-alumina foamed ceramics. The method of the invention has the advantages of simple equipment and process, low energy consumption, raw materials which are large-scale industrial products and easy realization of large-scale industrial production. The product not only has the high-strength characteristic of fireproof bricks, but also has the advantages of the light weight and heat preservation of ceramic fibers.

Description

technical field [0001] The invention relates to a method for preparing foamed ceramics based on nano-alumina. Background technique [0002] At present, refractory bricks and ceramic fibers are widely used as thermal insulation refractory materials in the field of industrial and laboratory electric furnaces and kilns at home and abroad. Due to its compact structure, large heat capacity and high thermal conductivity, refractory bricks do not meet the development requirements of energy saving and emission reduction. Lightweight ceramic fibers and vacuum formed articles are promoted in the art. The main ceramic fiber manufacturers in the world include: Morgan Thermal Ceramics Company of the United Kingdom, Unifax United Fiber Insulation Products Company of the United States, and Isowool Isolite Thermal Insulation Products Company of Japan. Large domestic ceramic fiber manufacturers include: Shandong Luyang Co., Ltd., Nanjing Tongjing Ceramic Fiber Co., Ltd., Hubei Kailong Chem...

Claims

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Application Information

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IPC IPC(8): C04B38/10C04B35/10
Inventor 熊友辉
Owner 武汉吉耐德科技有限公司
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