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Preparation method of superfine-diameter BCN and BN ceramic fibers

A ceramic fiber and fine-diameter technology, which is applied in the field of preparation of BCN and BN ceramic fibers, can solve the problems of difficult content, low boron content, single composition of BCN nanofibers, etc., and achieve the effect of simple and easy synthesis method

Active Publication Date: 2021-06-29
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The BCN nanofibers reported in the above literature have a single composition, especially the low boron content, and it is difficult to control the content of B, C, and N in a wide range.

Method used

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  • Preparation method of superfine-diameter BCN and BN ceramic fibers
  • Preparation method of superfine-diameter BCN and BN ceramic fibers
  • Preparation method of superfine-diameter BCN and BN ceramic fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of the BCN ceramic fiber of superfine diameter, comprises the following steps:

[0035] (1) Synthesis of BCN ceramic precursor: equimolar B 10 h 14 React with diaminodiphenylmethane in tetrahydrofuran at room temperature for 12 hours, and then remove the solvent by distillation at 100°C for 6 hours to obtain a BCN ceramic precursor.

[0036] (2) Solution spinning to prepare superfine fiber felt: get the BCN ceramic precursor body synthesized in the previous step of 1g, weigh 1g polystyrene according to the ratio of 100% of the BCN ceramic precursor body quality, and both dissolve in N, N- 5mL of dimethylformamide was prepared into a spinning solution, and the spinning solution was added to a plastic syringe, and the outlet of the syringe was connected to a spinneret, and the spinning was carried out under a high-purity nitrogen pressure of 3MPa, and a stainless steel wire mesh was used as a receiving device. The propulsion speed of the spinning ...

Embodiment 2

[0040] The preparation method of the BN ceramic fiber of superfine diameter, comprises the following steps:

[0041] (1) Synthesis of BCN ceramic precursor: equimolar B 10 h 14 React with diaminodiphenylmethane in tetrahydrofuran at room temperature for 12 hours, and then remove the solvent by distillation at 100°C for 6 hours to obtain a BCN ceramic precursor.

[0042] (2) Solution spinning to prepare superfine fiber felt: get 1g of the BCN ceramic precursor synthesized in the previous step, weigh 0.5g polystyrene according to the 50% ratio of the BCN ceramic precursor quality, and dissolve the two together in N,N- A mixed solution of dimethylformamide and tetrahydrofuran (volume ratio 3:1) is configured as a spinning solution, and the spinning solution is added to a plastic syringe, and the outlet of the syringe is connected to the spinneret, and is carried out under a high-purity nitrogen pressure of 3MPa. For spinning, a stainless steel wire mesh is used as the receiving d...

Embodiment 3

[0046] The preparation method of the BCN ceramic fiber of superfine diameter, comprises the following steps:

[0047] (1) Synthesis of BCN ceramic precursors: equimolar B 10 h 14 React with 4,4'-diamino-2,2'-dimethylbiphenyl in tetrahydrofuran at room temperature for 12 h, and then remove the solvent by distillation at 100 °C for 6 h to obtain the BCN ceramic precursor.

[0048] (2) solution spinning prepares ultra-fine fiber felt: get the BCN ceramic precursor body synthesized in the previous step of 1g, take by weighing 0.6g polystyrene according to the ratio of 60% of the BCN ceramic precursor body quality, the two are dissolved in N, N - 5 mL of mixed solution of dimethylformamide and tetrahydrofuran (volume ratio 5:1), prepared as spinning solution, adding the spinning solution into a plastic syringe, and connecting the spinneret to the outlet of the syringe, under the high-purity nitrogen pressure of 3MPa Carry out spinning under the ground, adopt stainless steel wire ...

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Abstract

The invention provides a preparation method of superfine-diameter BCN and BN ceramic fibers. The preparation method comprises the following steps: reacting the same amount of decaborane and nitrogen source molecules in tetrahydrofuran at room temperature for 10-14 hours, and then distilling at 90-110 DEG C for 5-8 hours to remove a solvent to obtain a BCN ceramic precursor; dissolving the BCN ceramic precursor and polystyrene in N,N-dimethylformamide or a mixed solution of N,N-dimethylformamide and tetrahydrofuran to prepare a spinning solution; carrying out solution spinning treatment on the spinning solution to obtain superfine fiber felt; and placing the superfine fiber felt in a vacuum sintering furnace, introducing protective gas, raising the temperature to 1200-1400 DEG C at the speed of 60-100 DEG C per minute, keeping the temperature for 2 h, and cooling to the room temperature, wherein when the introduced gas is nitrogen, BCN ceramic fibers with the superfine diameter is obtained; and when the introduced gas is the mixed gas of nitrogen and ammonia gas, superfine-diameter BN ceramic fibers are obtained.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular, to a preparation method of superfine-diameter BCN and BN ceramic fibers. Background technique [0002] B, C, and N are three adjacent elements in the periodic table. BCN materials have the characteristics of low density, adjustable band gap, and good high-temperature oxidation resistance. They are used in supercapacitors, catalysts, lithium batteries, luminescent materials, and Absorbing materials and other fields have shown good application prospects. Ultrafine BCN fiber and BN fiber material are new materials with broad application prospects. [0003] Ju Guangxu from Harbin Institute of Technology [Ju Guangxu. Preparation of boron carbon nitrogen nanofibers by electrospinning and their characterization [D]. Harbin Institute of Technology, Harbin, 2011.] Using boron oxide as the boron source and polyvinylpyrrolidone as the solution thickener, Precursor fibers were prepared...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08C04B35/56C04B35/583C04B35/622
CPCD01F9/08C04B35/62277C04B35/6229C04B35/632C04B2235/6567C04B2235/6562
Inventor 邵长伟王兵龙鑫王应德王小宙苟燕子韩成
Owner NAT UNIV OF DEFENSE TECH
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