Hyperelastic aerogel and preparation method thereof

An airgel and superelastic technology, which is applied in the field of superelastic inorganic material preparation, can solve the problems of low strength and compressive stress that cannot meet the needs of practical applications, and achieve the effects of improving service reliability, improving storage, and reducing free slip

Active Publication Date: 2022-04-15
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of superelastic aerogel and preparation method thereof, can solve existing nanowire or The low strength and compressive stress of nanoribbon airgel under the condition of high compressive strain cannot meet the technical problems of practical application requirements

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  • Hyperelastic aerogel and preparation method thereof
  • Hyperelastic aerogel and preparation method thereof
  • Hyperelastic aerogel and preparation method thereof

Examples

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preparation example Construction

[0040] Described a kind of superelastic airgel and preparation method thereof, comprise the following steps:

[0041] SiC nanowire airgel or Si 3 N 4 Nanoribbon airgel is used as raw material, and a layer of pyrolytic carbon is deposited on the surface of nanowires by chemical vapor deposition (CVD). The deposited pyrolytic carbon can "weld" the nanowires that originally had only physical contact. A pyrolytic carbon node is formed between them, and the node is fixed and cannot be rotated.

[0042] CVD process: the temperature of chemical vapor deposition is 900-1200°C, the heating rate of the deposition furnace is 0.1-10°C / min, the pressure in the furnace is 1-20kPa, the precursor is methane, and the gas flow rate is 10-200ml / min. The time is 1h~30h.

Embodiment 1

[0044] This embodiment has prepared the density is 40mg / cm 3 superelastic airgel;

[0045] Choose 10mg / cm 3 The SiC nanowire airgel is used as the raw material, placed in the CVD furnace, vacuumed, and the temperature is raised to 800°C at a rate of 10°C / min, and the carbon source precursor gas methane is introduced, and the flow rate of methane is controlled to 10ml / min. Then increase the temperature to 900°C at a rate of 0.1°C / min, and keep it warm for 30 hours to obtain a density of 40mg / cm 3 superelastic airgel.

[0046] Such as figure 1 and image 3 As shown, after SiC nanowire airgel was treated with CVD pyrolytic carbon, the nanowires were successfully welded by pyrolytic carbon; after SiC nanowire airgel was treated with CVD pyrolytic carbon, both the strength and compressive have been greatly enhanced to become superelastic aerogels: see Figure 6 ,Such as Figure 6 As shown in (a), the black, blue, purple and green lines represent the stress curves when the co...

Embodiment 2

[0048] This example prepared a density of 10mg / cm 3 superelastic airgel;

[0049] Choose 4mg / cm 3 The SiC nanowire airgel is used as raw material, placed in a CVD furnace, vacuumed, and the temperature is raised to 800°C at a rate of 10°C / min, and the carbon source precursor gas methane is introduced, and the flow rate of methane is controlled to 15ml / min. Then increase the temperature to 1000°C at a rate of 2°C / min, and keep it warm for 6 hours to obtain a density of 10mg / cm 3 superelastic aerogels, such as Figure 4 As shown, the thickness of the pyrolytic carbon layer on the surface of SiC nanowires is 40nm.

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Abstract

The invention discloses hyperelastic aerogel and a preparation method thereof, and belongs to the technical field of aerogel material preparation, the hyperelastic aerogel takes SiC nanowire aerogel or Si3N4 nanobelt aerogel as a raw material, a pyrolytic carbon layer with the thickness of about 60-140 nm is deposited on the surface of a SiC nanowire or a Si3N4 nanobelt in a chemical vapor deposition (CVD) mode, and the hyperelastic aerogel is prepared. The nanowires or the nanoribbons are welded together, and pyrolytic carbon nodes between the nanowires or the nanoribbons are fixed and cannot rotate. The obtained hyperelastic aerogel can be completely recovered under the compression strain reaching up to 80%, has excellent compression anti-fatigue performance, and has wide application prospects in the fields of aerospace and civil high-performance damping, sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of superelastic inorganic materials, and in particular relates to a superelastic airgel and a preparation method thereof. Background technique [0002] Airgel is the lightest solid material known to man, with ultra-high porosity and ultra-high specific surface area, and has great application potential in thermal insulation, energy storage, catalyst carrier, sound insulation, etc. However, traditional aerogels face the disadvantage of brittleness, which greatly reduces their reliability in practical applications. In recent years, the brittleness of airgel has been gradually overcome. Researchers use ceramic nanowires or ceramic nanobelts as structural units to replace ceramic nanoparticles in traditional aerogels. Due to the excellent deformability of ceramic nanowires or ceramic nanobelts with high aspect ratios, aerogels present Excellent compressibility. [0003] Although the brittleness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
CPCC04B41/85C04B41/5001C04B41/009C04B41/4531C04B35/565C04B35/584
Inventor 王红洁卢德庄磊牛敏苏磊彭康
Owner XI AN JIAOTONG UNIV
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