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Preparation method of polycrystalline alumina fiber high-temperature thermal insulating material

A polycrystalline alumina and heat insulating material technology, applied in the field of high temperature heat insulating materials, can solve the problems of high bulk density and low service temperature, and achieve the effects of low bulk density, small thermal conductivity and high service temperature

Active Publication Date: 2013-09-04
河南恒进新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of polycrystalline alumina fiber high-temperature heat insulation material, which overcomes the high volume density of existing high-temperature heat insulation materials and the use of Due to the lack of low temperature, we have prepared a product with a working temperature between 1600°C and 1700°C, a bulk density of less than 0.4g / cm3, a normal temperature compressive strength greater than 1.0 MPa, and a thermal conductivity (350°C). Less than 0.1 W / (m·K), a new type of lightweight high-temperature insulation material

Method used

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  • Preparation method of polycrystalline alumina fiber high-temperature thermal insulating material
  • Preparation method of polycrystalline alumina fiber high-temperature thermal insulating material
  • Preparation method of polycrystalline alumina fiber high-temperature thermal insulating material

Examples

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Effect test

Embodiment 1

[0022] First soak 90 parts of alumina fiber cotton, 10 parts of fumed silica, 0.75 parts of titanium dioxide and 0.75 parts of cerium oxide in 1000 parts of water, then stir it with a smoothie mixer for 60 seconds to make it fully mixed and evenly crushed to obtain The length of short alumina fibers is 0.5-2mm. It is also possible to first add 90 parts of alumina fiber cotton to 1000 parts of water for soaking and then crush it with a smoothie mixer to obtain short alumina fibers, which are then mixed evenly with 10 parts of fumed silica, 0.75 parts of titanium dioxide and 0.75 parts of cerium oxide Get a slurry.

[0023] Al 2 o 3 The content is 95%, the average diameter is 3.0μm; the average particle size of fumed silica is 20nm, and the specific surface area is 150m 2 / g, SiO 2 Content ≥ 99%; the purity grades of titanium dioxide and ceria are both analytically pure.

[0024] The uniformly mixed slurry is formed by vacuum filtration with a vacuum degree of -0.04MPa, and...

Embodiment 2

[0028] 1) First soak 90 parts of alumina fiber cotton, 10 parts of fumed silica, and 1.5 parts of cerium oxide in 1000 parts of water, then stir it with a smoothie mixer for 60 seconds to make it fully mixed to obtain a slurry. The obtained short alumina fibers have a length of 0.5-2mm. The pulping method can also be used: take 90 parts of alumina fiber cotton, add 1000 parts of water to soak it, add water to completely soak the alumina fiber cotton, stir it with a smoothie mixer for 60 seconds, and beat the alumina fiber cotton crushed to obtain short alumina fibers; then the short alumina fibers were mixed evenly with 10 parts of fumed silica and 1.5 parts of cerium oxide to obtain a slurry;

[0029] Al 2 o 3 content of 95%, average diameter of 3.0μm, fumed silica with average particle diameter of 20nm and specific surface area of ​​150m 2 / g, SiO 2 Hydrophilic fumed silica with content ≥99%, the purity grade of ceria is analytically pure.

[0030] 2) Quickly form t...

Embodiment 3

[0034] 1) First soak 90 parts of alumina fiber cotton, 10 parts of fumed silica, 0.75 parts of aluminum trifluoride and 0.75 parts of cerium oxide in 1000 parts of water, then stir it with a smoothie mixer for 60 seconds to make it fully mixed Uniform, crushed alumina short fibers have a length of 0.5-2mm. Al 2 o 3 The content is 95%, the average diameter is 3.0μm; the average particle size of fumed silica is 20nm, and the specific surface area is 150m 2 / g, SiO 2 Content ≥99%; the purity grades of aluminum trifluoride and ceria are analytically pure.

[0035] 2) The uniformly mixed slurry is formed by vacuum filtration with a vacuum degree of -0.04MPa, and then the formed block is dried and sintered under the following temperature regime:

[0036]

[0037] After testing, the physical and chemical indicators of the prepared product are: bulk density 0.36g / cm3, normal temperature compressive strength 1.06MPa, high temperature linear shrinkage rate at 1600°C 1.00%, therma...

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Abstract

The invention discloses a preparation method of a polycrystalline alumina fiber high-temperature thermal insulating material. The preparation method includes: step A, pulping, adding water into 85-95 parts of by weight of alumina fiber to soak, breaking the alumina fiber to obtain alumina short fiber, and evenly mixing the alumina short fiber with 5-10 parts of fumed silica and 1.0-2.5 parts of agglutinant to obtain slurry; step B, drying the slurry after the slurry is formed through vacuum filtration; and step C, performing hard fire on the formed product at a temperature of 1550-1650 DEG C and maintaining the temperature for 6-10 hours. Compared with the existing thermal insulating materials, the polycrystalline alumina fiber high-temperature thermal insulating material prepared through the method has low volume density and thermal conductivity, and can be used at a temperature of 1600-1700 DEG C.

Description

technical field [0001] The invention belongs to the field of high-temperature heat-insulating materials, and mainly relates to a light-duty high-temperature heat-insulating material with alumina fiber and fumed silica as main raw materials and a preparation method thereof, in particular to a polycrystalline alumina fiber high-temperature heat-insulating material Preparation. Background technique [0002] With the development and progress of social science and technology, energy problems have become one of the major problems that hinder social development and need to be solved urgently, and energy conservation has become a topic of increasing concern. In order to meet this need, the development and application of new refractory insulation materials is imminent. There are many types of insulation materials on the market at present, and the quantity is huge. In general, as the temperature increases, the types of materials that can be selected tend to decrease: below 1000 ° C,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/10C04B35/622
Inventor 胡平舸时彬彬葛铁柱李素平
Owner 河南恒进新材料科技有限公司