Nano miroporous heat-insulating material

A thermal insulation material and nano-microporous technology, applied in the field of thermal insulation materials with nano-microporous structure, can solve problems such as unfavorable high temperature stability of materials, achieve excellent thermal insulation performance and mechanical strength, improve mechanical strength, and reduce the effect of thermal conductivity.

Inactive Publication Date: 2013-03-20
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although inorganic lightweight fillers help to increase the porosity, strength and thermal insulation performance of thermal insulation materials, some of the raw materials, such as expanded perlite, glass microspheres, etc., will not be conducive to the high temperature stability of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] With 55wt% nano silicon dioxide, 10wt% potassium hexatitanate and 10wt% zirconium silicate, 10wt% zirconium oxide, and 15wt%% aluminum zirconate fiber, mix uniformly in a high-speed mixer, dry press molding into 400mm (long ) × 200mm (width) × 25mm (thickness) plate, finally sintered at 800°C for 1 hour, and cooled with the furnace to obtain nano-microporous insulation material A.

[0026] The bulk density of nano-microporous insulation material A is 250Kg / m 3 , thermal conductivity 0.023W / mk (400°C), 0.030W / mk (800°C), compressive strength 320KPa, 1000°C / 12 hours heat preservation, the linear shrinkage of nano-microporous insulation material A is less than 0.5%.

Embodiment 2

[0028] 60wt% nano-silica, 15wt% zirconium silicate, 10wt% alumina, 10wt% alumina fiber and 5wt% aluminum zirconate fiber were uniformly mixed in a high-speed mixer, and dry pressed into a shape of 400mm (length) × 200mm (width)×25mm (thickness) plate, finally sintered at 800° C. for 1 hour, and cooled with the furnace to obtain nano-microporous insulation material B.

[0029] The bulk density of nano-microporous insulation material B is 280Kg / m 3 , thermal conductivity 0.025W / mk (400°C), 0.032W / mk (800°C), compressive strength 600KPa, 1000°C / 12 hours heat preservation, the linear shrinkage of nano-microporous insulation material B is less than 0.5%.

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Abstract

The invention relates to a heat-insulating material in a nano miroporous structure. A method for preparing the heat-insulating material comprises the following steps of: (1) stirring and mixing raw materials including nanoscale silica, an infrared opacifier, reinforced fibers and a refractory material to obtain a mixture; and (2) enabling the mixture obtained in the step (1) to be subjected to dry pressing, and sintering at 800 DEG C for at least 1 hour to obtain a target object. The nanoscale silica accounts for 40-80% of the total weight of the raw materials, the infrared opacifier accounts for 10-30%, the reinforced fibers account for 5-15%, and the refractory material accounts for 5-15%. The heat-insulating material provided by the invention has good excellent heat insulating properties and mechanical strength and can be used for a long time at a high temperature.

Description

technical field [0001] The invention relates to a thermal insulation material with a nano-microporous structure. Background technique [0002] High-performance thermal insulation materials are of great significance for energy saving and consumption reduction. Due to its unique microstructure, nano-microporous thermal insulation materials have excellent thermal insulation properties, and their thermal conductivity can even be lower than that of vacuum. The iron and steel industry is a high-energy-consuming industry. If high-performance thermal insulation materials are used for the lining of the blast furnace, the energy utilization rate will be effectively improved. However, in addition to the ultra-low thermal conductivity, the thermal insulation material for the lining of the blast furnace should also have certain mechanical strength and long-term stability under high temperature (800-1000°C). [0003] USP.6,818,273 discloses a thermal insulation material composition with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B38/00
Inventor 胡一晨柯美亚吴朝齐赵玲娣蓝振华王中俭
Owner EAST CHINA UNIV OF SCI & TECH
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