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3D printing silicon nitride fiber aerogel and preparation method and application thereof

A silicon nitride fiber, 3D printing technology, applied in the field of 3D printing, can solve the problems of difficult large-scale application, complex preparation method, poor heat resistance, etc., and achieve the effect of simple and cheap raw materials and simple preparation process

Inactive Publication Date: 2021-12-07
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, polymer fibers are commonly used to construct fiber aerogels, but the polymer itself has poor heat resistance, which limits the use of fiber aerogels.
Although a series of airgel materials based on inorganic ceramic fibers have been developed in the prior art, their preparation methods are complicated, and the reaction atmosphere and precursor components need to be strictly controlled, making it difficult to apply them on a large scale.
There is no report on the preparation of silicon nitride fiber airgel by 3D printing

Method used

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  • 3D printing silicon nitride fiber aerogel and preparation method and application thereof
  • 3D printing silicon nitride fiber aerogel and preparation method and application thereof
  • 3D printing silicon nitride fiber aerogel and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Grinding and dispersing 5g of water, 1g of polyvinyl alcohol, 50g of graphene and 50g of fumed silica to obtain printing ink;

[0043] 2) Place the printing ink obtained in step 1) in a crucible, put it into a tube furnace protected by a high-purity nitrogen atmosphere, heat up to 1500 degrees Celsius at a rate of 3 degrees Celsius / minute, keep it warm for 4 hours, cool with the furnace, and take out the crucible to obtain Silicon nitride fiber airgel material.

[0044] figure 1 It is a photo of the silicon nitride fiber airgel material in Example 1. It can be seen that the silicon nitride fiber airgel is white in color and has good bendability.

[0045] figure 2 It is a scanning electron microscope image of the silicon nitride fiber airgel material in Example 1. It can be seen that the airgel material has a fiber structure as a unit, and the fiber diameter is about tens of nanometers.

[0046] image 3 It is the photo of the silicon nitride fiber airgel burned ...

Embodiment 2

[0048] 1) Grinding and dispersing 5g of water, 1g of polyvinyl alcohol, 40g of graphene and 50g of fumed silica to obtain printing ink;

[0049] 2) Put the ink obtained in step 1) into the syringe of the direct writing printer, set the program, and then print out the designed part;

[0050] 3) Place the printed part obtained in step 2) in a crucible, and put it into a tube furnace protected by a high-purity nitrogen atmosphere, raise the temperature to 1500 degrees Celsius at 4 degrees Celsius / min, keep it warm for 4 hours, cool with the furnace, and take out the crucible. A silicon nitride fiber airgel material is obtained.

[0051] Figure 4 The printing process of the direct writing printed product and the photo of the obtained product in Example 2, it can be seen that the printed product is black, and a variety of different printing structures can be obtained.

[0052] Figure 5 It is a scanning electron microscope image of the silicon nitride fiber airgel material in Exa...

Embodiment 3

[0055] 1) Grinding and dispersing 5g acetone, 0.5g polymethyl methacrylate, 50g graphene and 50g fumed silica to obtain printing ink;

[0056] 2) Put the ink obtained in step 1) into the syringe of the direct writing printer, set the program, and then print out the designed part;

[0057] 3) Place the printed part obtained in step 2) in a crucible, and put it into a tube furnace protected by a high-purity nitrogen atmosphere, raise the temperature to 1600 degrees Celsius at 4 degrees Celsius / min, keep it warm for 5 hours, cool with the furnace, and take out the crucible A silicon nitride fiber airgel material is obtained.

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Abstract

The invention discloses 3D printing silicon nitride fiber aerogel and a preparation method and application thereof. The method comprises the following steps: (1) carrying out high-temperature sintering on printing ink containing a silicon source, a carbon source and a polymer binder in a nitrogen atmosphere to obtain silicon nitride fiber aerogel; or (1 ') carrying out 3D printing on the printing ink containing the silicon source, the carbon source and the polymer binder to obtain a printed part; and carrying out high-temperature sintering on the printed part in a nitrogen atmosphere to obtain the silicon nitride fiber aerogel. The used raw materials are simple and cheap, the preparation process is simple, the silicon nitride fiber aerogel is obtained in a printing ink or direct ink writing mode for the first time, and the prepared silicon nitride fiber aerogel is complete in structure, can be endowed with a complex structure through the 3D printing method and can be applied to the fields of flame retardance, heat preservation, heat insulation, adsorption, sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a 3D printing silicon nitride fiber airgel and a preparation method and application thereof. Background technique [0002] Airgel materials have the advantages of low density, large specific surface area, and excellent thermal insulation performance, and are widely used in many fields such as thermal insulation, pollutant adsorption, and sensors. Compared with the aerogels of particles or sheet building units, the aerogels constructed with fibers as the basic unit show lower density and larger specific surface area. Among them, polymer fibers are commonly used to construct fiber aerogels, but the polymer itself has poor heat resistance, which limits the use of fiber aerogels. Although a series of airgel materials based on inorganic ceramic fibers have been developed in the prior art, their preparation methods are complicated, and the reaction atmosphere and precu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/634C04B35/64C04B35/622C04B38/00B33Y80/00B33Y10/00
CPCC04B38/00C04B35/591C04B35/63408C04B35/634C04B35/63416C04B35/63432C04B35/63424C04B35/64C04B35/62295B33Y80/00B33Y10/00C04B2235/77C04B2235/3418C04B2235/483C04B2235/36C04B2235/425C04B2235/424C04B2235/5288C04B2235/422C04B2235/46C04B2235/6562C04B2235/6565C04B2235/6026
Inventor 朱光达侯仪赵宁徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI