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A kind of three-dimensional carbon-rich nanofiber ceramic airgel and its preparation method

A nanofiber and aerogel technology, which is applied in the field of three-dimensional carbon-rich nanofiber ceramic aerogel and its preparation, can solve problems such as deficiencies, achieve excellent mechanical properties, low production cost, and excellent compressible rebound and anti-fatigue characteristics Effect

Active Publication Date: 2022-04-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the lack of carbon content in the fiber ceramic airgel material prepared by the preparation method of the general fiber ceramic airgel material, which leads to the problem of its limited application in the high temperature field, the purpose of the present invention is to provide a three-dimensional carbon-rich The preparation method of nanofiber ceramic airgel can increase the carbon content ratio in fiber ceramic airgel and improve its high-temperature heat insulation performance

Method used

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  • A kind of three-dimensional carbon-rich nanofiber ceramic airgel and its preparation method
  • A kind of three-dimensional carbon-rich nanofiber ceramic airgel and its preparation method
  • A kind of three-dimensional carbon-rich nanofiber ceramic airgel and its preparation method

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Embodiment 1

[0023] The invention is based on the principle of preparing nanofibers by electrospinning method, by controlling the distance between an electrospinning needle and a collector, and using the directional weakening electric field force generated by a far electric field to prepare and shape a three-dimensional carbon-rich nanofiber ceramic airgel. The specific device mainly includes the following parts: high-voltage DC power supply, intelligent injection pumping controller, electrospinning precursor injection device, and sparse metal mesh collection device; among them, the intelligent injection pumping controller mainly regulates the stepping injection flow rate of the injection device The electrospinning precursor injection device pushes the precursor solution into the electrospinning needle; the high-voltage DC power supply mainly provides the high-voltage DC electrostatic field for electrospinning; the sparse metal mesh collection device is mainly used to collect and form the th...

Embodiment 2

[0030] A preparation method of a three-dimensional carbon-rich nanofiber ceramic airgel, as follows:

[0031] 1) Under the temperature condition of 40℃~60℃, fully dissolve and mix the methanol solution of polyzirconium acetylacetonate and yttrium nitrate hexahydrate with the methanol solution of silane coupling agent KH550, and then add the high molecular weight polyethylene oxide PEO The methanol solution is fully co-dissolved to obtain a highly spinnable binary silicon-zirconium ceramic electrospinning precursor solution; wherein, the raw material formula is as follows according to the mass ratio: polyzirconium acetylacetonate: yttrium nitrate hexahydrate: silane coupling Agent KH550: high molecular weight polyethylene oxide PEO: methanol = 50:20:83:0.4:350.

[0032] 2) Take the above 35ml highly spinnable binary silicon-zirconium ceramic electrospinning precursor, stably control the temperature at room temperature 26°C, humidity conditions at 50%, and the distance between t...

Embodiment 3

[0036] to combine figure 2 , The structural characterization test photos of the three-dimensional carbon-rich nanofiber ceramic airgel prepared by far electric field-electrospinning are as follows:

[0037] The present invention proposes to prepare three-dimensional carbon-rich nanofiber ceramic airgel through the method of far electric field-electrospinning, and control the distance between the electrospinning needle and the collector to keep 0.5m to 0.7m, and the current precursor is at the electrospinning needle When being pushed out, the droplet first forms a Taylor cone under the combined action of the high-voltage electrostatic field force and the surface tension of the liquid. When the charge repulsion on the droplet under the action of the electric field is greater than the surface tension of the liquid, a scattering jet is formed at the tail of the Taylor cone. At the same time, it moves along a complex trajectory in the far electric field and entangles with each oth...

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Abstract

The invention discloses a three-dimensional carbon-rich nanofiber ceramic airgel and its preparation method. It is based on a far electric field-electrospinning preparation method. The method is specifically as follows: combining highly polymerized zirconium acetylacetonate powder with phase stabilizer yttrium element At the same time, the silane coupling agent KH550 was introduced to prepare the highly spinnable binary silicon-zirconium ceramic electrospinning precursor by dissolving the polymer polyethylene oxide PEO in methanol. The binary silicon-zirconium nanofiber ceramic airgel precursor with a layered structure is finally subjected to step-by-step high-temperature annealing crystallization heat treatment and chemical crosslinking to obtain a three-dimensional carbon-rich nanofiber ceramic airgel with a complete shape and structure. The preparation method involved in the invention has the advantages of low production cost and simple production process, and the prepared three-dimensional carbon-rich nanofiber ceramic airgel material has relatively high carbon content, excellent high-temperature heat insulation performance and mechanical performance.

Description

technical field [0001] The invention relates to the fields of thermal management and inorganic nano-insulation materials, in particular to a three-dimensional carbon-rich nanofiber ceramic airgel and a preparation method thereof. Background technique [0002] At present, the most widely used heat-insulating ceramic airgel is the traditional silica airgel material formed by stacking zero-dimensional hollow nanoparticles. During use, the material structure is prone to mechanical damage and high-temperature devitrification, which severely limits the application of silica ceramic aerogels. It has been found through research that using one-dimensional fiber structure to mechanically strengthen traditional zero-dimensional granular ceramic airgel materials can not only retain the excellent thermal insulation performance of ceramic airgel composed of all-ceramic components, but also further strengthen Its mechanical strength, such as glass fiber, mullite fiber and other reinforced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/80C04B35/622C04B35/624
CPCC04B38/0045C04B35/80C04B35/622C04B35/624C04B2235/48C04B2235/483C04B2235/3225C04B2235/60C04B2235/656C04B2235/6562C04B2235/6567C04B2235/9607C04B2235/94C04B38/0038
Inventor 徐翔李惠付树彬郭靖然刘荻舟
Owner HARBIN INST OF TECH
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