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Three-dimensional carbon-rich nanofiber ceramic aerogel and preparation method thereof

A nanofiber and aerogel technology, applied in ceramic products, other household appliances, applications, etc., can solve problems such as deficiencies, and achieve the effects of excellent mechanical properties, simple production process and low production cost

Active Publication Date: 2022-02-01
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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  • Three-dimensional carbon-rich nanofiber ceramic aerogel and preparation method thereof
  • Three-dimensional carbon-rich nanofiber ceramic aerogel and preparation method thereof
  • Three-dimensional carbon-rich nanofiber ceramic aerogel and preparation method thereof

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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] 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 other....

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Abstract

The invention discloses a three-dimensional carbon-rich nanofiber ceramic aerogel and a preparation method thereof, and the preparation method is based on a far electric field-electrostatic spinning preparation method, and the method specifically comprises the following steps: after highly polymerized zirconium acetylacetonate powder is combined with a phase stabilizer yttrium element, introducing a silane coupling agent KH550 at the same time; co-dissolving macromolecular polyoxyethylene PEO in methanol to prepare a binary silicon-zirconium ceramic electrostatic spinning precursor with high spinnability, and then preparing and forming a binary silicon-zirconium nanofiber ceramic aerogel precursor with a three-dimensional layered structure through a far electric field-electrostatic spinning method; and finally, carrying out step-by-step high-temperature annealing crystallization heat treatment and chemical crosslinking to obtain the three-dimensional carbon-rich nanofiber ceramic aerogel with an intact shape structure. The preparation method provided by the invention has the advantages of low production cost and simple production process, and the prepared three-dimensional carbon-rich nanofiber ceramic aerogel material has high carbon content and 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 Applications(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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