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Ceramic aerogel and method for preparing the ceramic aerogel by gel injection moulding

A gel injection molding and aerogel technology, which is applied in the field of porous materials, can solve the problems of easy collapse and damage of pores, low heat resistance temperature, poor thermal insulation performance of porous materials, etc., and achieves excellent thermal insulation performance and high porosity. , the effect of good formability

Active Publication Date: 2009-09-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the pores of the existing airgel are easy to collapse and damage under the action of external force, the heat-resistant temperature is low, and the heat insulation performance of the porous material obtained by the existing gel injection molding method is poor; A kind of ceramic airgel and the method for preparing ceramic airgel by gel injection molding

Method used

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  • Ceramic aerogel and method for preparing the ceramic aerogel by gel injection moulding

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specific Embodiment approach 1

[0015] Specific Embodiment 1: In this embodiment, the ceramic airgel is composed of overlapping ceramic particles to form a three-dimensional skeleton structure, with a porosity of 50% to 90% (volume), and a micron-scale pore diameter, most likely below 3 μm.

[0016] The heat-resistant temperature of the ceramic airgel in this embodiment is 1000° C. to 3000° C., and the compressive strength is 1 to 50 MPa.

specific Embodiment approach 2

[0017] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the porosity of the ceramic airgel is 60% to 85% (volume). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the porosity of the ceramic airgel is 65%-80% (volume). Others are the same as in the first embodiment.

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Abstract

A ceramic aerogel and a method for preparing the ceramic aerogel by gel injection moulding belong to the field of porous materials. The invention solves the problem that the prior aerogel has easily broken and damaged air holes under the action of external force and low heat resistant temperature, and that the porous material prepared by prior gel injection moulding has bad heat-insulating property. The ceramic aerogel forms a three-dimensional skeleton structure by mutually jointing ceramic particles, porosity thereof is 50-90%, the aperture is micrometre-sized, and the most probable aperture can be below 3 microns. The ceramic aerogel is prepared by the gel injection moulding technology under the conditions of low solid phase content and no any foaming agent and pore forming agent. The product of the method has uniform aperture size distribution, heat resistance, thermal insulation and high intensity, is light, and can be used as heat-proof material of high-temperature structure. The heat-resistant temperature thereof is 1000-3000 DEG C and the compressive strength is 1-50 MPa. The method of the invention has a simple technology and short flow, can prepare finished pieces with complex shapes, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of porous materials, and in particular relates to ceramic airgel and a preparation method thereof. Background technique [0002] Due to the characteristics of light weight, large specific surface area, and small thermal conductivity, porous materials have set off a wide research boom in the world in recent years. Studies have shown that, without changing the structural state, the larger the porosity and the smaller the pore size of the porous material, the better its thermal insulation performance. [0003] Porous materials include aerogels, porous ceramics, porous metals, etc. Airgel materials have extremely high porosity (above 80%), and their pore sizes are extremely small, most of which are within the nanoscale range. Because of the above-mentioned characteristics of airgel, it has excellent thermal insulation performance, and is even called a super thermal insulation material. At present, airgel is mainly prep...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/624B28C1/04
Inventor 黄玉东吴丽娜刘丽
Owner HARBIN INST OF TECH
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