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Preparation method of superfine-diameter SiBCN ceramic fibers

A ceramic fiber and superfine fiber technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of complex process and unfavorable large-scale preparation of SiBCN superfine fiber, and achieve high synthesis yield and simple synthesis method , The effect of high ceramic productivity

Active Publication Date: 2021-07-23
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above reports, both the synthesis of polymers and their electrospinning process require an anhydrous and oxygen-free synthesis environment and electrospinning equipment, as well as the cross-linking treatment process of ammonia or chlorosilane, which is complicated and not conducive to large-scale Preparation of SiBCN ultrafine fibers

Method used

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  • Preparation method of superfine-diameter SiBCN ceramic fibers
  • Preparation method of superfine-diameter SiBCN ceramic fibers
  • Preparation method of superfine-diameter SiBCN ceramic fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of preparation method of superfine diameter SiBCN ceramic fiber, comprises the following steps:

[0035] The preparation of spinning solution: (1) weigh decaborane B respectively 10 h 14 , 1,3-bis(aminopropyl)tetramethyldisiloxane and polyvinylpyrrolidone, the ratio of the amount of substances is 1:1.1:0.5, decaborane and 1,3-bis(aminopropyl) tetra Methyl disiloxane was dissolved in tetrahydrofuran to obtain decaborane solution and diamine solution, and polyvinylpyrrolidone was dissolved in N,N'-dimethylformamide to obtain polyvinylpyrrolidone solution; (2) by constant pressure separatory funnel to B 10 h 14 Add diamine solution dropwise into the solution, react at room temperature for more than 10 hours, and vacuum distill for 8 hours under the condition of constant temperature water bath at 60°C; (3) Add polyvinylpyrrolidone solution and ultrasonicate for 20 minutes to obtain a transparent solution, which is the spinning solution.

[0036] Preparation of na...

Embodiment 2

[0039] A kind of preparation method of superfine diameter SiBCN ceramic fiber, comprises the following steps:

[0040] Preparation of spinning solution: (1) Weigh decaborane, hexamethyldisilazane and polyvinylpyrrolidone respectively, the ratio of the amount of substances is 1:1.2:1.0, decaborane and hexamethyldisilazane Azane was dissolved in tetrahydrofuran to obtain decaborane solution and diamine solution, and polyvinylpyrrolidone was dissolved in N,N'-dimethylformamide to obtain polyvinylpyrrolidone solution; (2) through a constant pressure separatory funnel to B 10 h14 Add diamine solution dropwise to the solution, react at room temperature for more than 10 hours, and vacuum distill for 12 hours under the condition of constant temperature water bath at 60°C; (3) Add polyvinylpyrrolidone solution and ultrasonicate for 20 minutes to obtain a transparent solution, which is the spinning solution.

[0041] Preparation of nanofibers: (4) First, the spinning solution is poured...

Embodiment 3

[0044] A kind of preparation method of superfine diameter SiBCN ceramic fiber, comprises the following steps:

[0045] Preparation of spinning solution: (1) Weigh decaborane, [3-(trimethoxysilyl)propyl]ethylenediamine and polyvinylpyrrolidone respectively, the ratio of the amount of substances is 1:1.2:0.8, Decaborane and [3-(trimethoxysilyl)propyl]ethylenediamine were dissolved in tetrahydrofuran to obtain decaborane solution and diamine solution, and polyvinylpyrrolidone was dissolved in N,N'-dimethylformaldehyde Obtain polyvinylpyrrolidone solution in amide; (2) pass constant pressure separatory funnel to B 10 h 14 Add diamine solution dropwise to the solution, react at room temperature for more than 10 hours, and vacuum distill for 10 hours under the condition of constant temperature water bath at 60°C; (3) Add polyvinylpyrrolidone solution and ultrasonicate for 20 minutes to obtain a transparent solution, which is the spinning solution.

[0046] Preparation of nanofiber...

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Abstract

The invention provides a preparation method of superfine-diameter SiBCN ceramic fibers. The preparation method comprises the following steps: preparing a decaborane solution, a diamine solution and a polyvinyl pyrrolidone solution; dropwise adding the diamine solution into the decaborane solution, reacting for more than 10 hours at room temperature, and then carrying out vacuum distillation for 8-12 hours under the 55-65 DEG C constant-temperature water bath condition to obtain silicon-containing polyborazine; adding a polyvinyl pyrrolidone solution into the silicon-containing polyborazine, and carrying out ultrasonic treatment to obtain a transparent spinning solution; performing electrostatic spinning treatment on the spinning solution to obtain superfine fibers; and placing the superfine fibers in a sintering furnace, heating to 1400-1600 DEG C from room temperature at a heating rate of 1-5 DEG C / min in an inert atmosphere, and cooling to 100 DEG C or below along with the furnace to obtain the superfine-diameter SiBCN ceramic fibers. The synthesis method is simple and easy to implement, and is suitable for the application field of preparing flexible, high-temperature-resistant and heat-insulating multifunctional materials.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a preparation method of superfine-diameter SiBCN ceramic fibers. Background technique [0002] SiBCN ceramics are a class of ceramic materials mainly composed of four elements such as Si, B, C, and N. Due to their typical covalent bond ceramic characteristics and low atomic migration rate, they have very outstanding high-temperature stability, so they are widely used in aviation. It has broad application prospects in aerospace and other thermal structural materials. At the same time, since the four elements constitute a variety of microstructures with different dielectric properties, such as insulating properties such as Si3N4 and BN, semiconductor properties of SiC, and conductive properties of C, they will also exhibit a wide range of dielectric properties. Used as a special electromagnetic wave dielectric material. [0003] The polymer precursor conversion method is an...

Claims

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Application Information

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IPC IPC(8): D01F9/10C04B35/58C04B35/622
CPCC04B35/62272C04B35/58D01F9/10C04B2235/94C04B2235/95
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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