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A kind of surfactant-assisted method for synthesizing boron nitride with high crystallinity

A surfactant, high crystallinity technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of high calcination temperature, high cost of templating agent CTAB, long production cycle, etc., to reduce the crystallization temperature, Conducive to non-toxic production and environmental protection, the effect of saving energy

Active Publication Date: 2016-08-24
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(P.Dibandjo, L.Bois.Thermal stability of mesoporous boron nitride templated with acationic surfactant.Journal of the European Ceramic Society.2007,27:313-317) However, in this method, MAB needs multi-step reactions to synthesize and production cycle Disadvantages such as long length, high calcination temperature, and high cost of template agent CTAB

Method used

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  • A kind of surfactant-assisted method for synthesizing boron nitride with high crystallinity
  • A kind of surfactant-assisted method for synthesizing boron nitride with high crystallinity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Dissolve 0.06mol sodium borohydride and 0.06mol ammonium fluoroborate in 30mL dioxane respectively, add them to the flask successively, stir with electromagnetic at 40℃ for 2h, let stand and cool to room temperature, and filter with suction to obtain ammonia borane Clear solution, set aside;

[0021] (2) Pour all the clarified liquid prepared in step (1) into the autoclave, then add 0.1 g of octadecylamine into the autoclave, stir electromagnetically until it dissolves to obtain the ammonia borane-surfactant mixed solution, 130 ℃ solvent heat 3h, let it stand and cool to room temperature, and distill the solvent out under reduced pressure at 60℃ to obtain white hybrid powder, ready for use;

[0022] (3) Put the white powder obtained in step (2) in a tube furnace, calcinate at 1000°C in an ammonia atmosphere, hold for 5 hours, and then calcinate in a muffle furnace at 700°C in air atmosphere for 2 hours to obtain a highly crystalline product Degree boron nitride

Embodiment 2

[0024] The ammonium fluoroborate in step (1) in Example 1 was replaced with ammonium formate, and the other steps were the same as in Example 1. The obtained product is boron nitride powder with high crystallinity.

Embodiment 3

[0026] The octadecylamine in step (2) in Example 1 was replaced with SDS, and the other steps were the same as in Example 1. The obtained product is boron nitride powder with high crystallinity.

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Abstract

The invention discloses a method for assisted synthesis of high-crystallization boron nitride by utilizing a surfactant. The method comprises the following steps: (1) mixing 30 parts of 0.002mol of sodium borohydride in per ml of dioxane solution and 30 parts of 0.002mol of ammonium salt in per ml of dioxane solution, reacting and then carrying out suction filtration to obtain a clear ammonia borane solution for later use; (2) pouring the clear solution prepared in the step (1) into a high-pressure kettle, adding 0.01-0.1g of a surfactant into per 60ml of the clear solution, heating a solvent at 130 DEG C for 3-7 hours, standing and cooling to the room temperature, carrying out reduced pressure distillation on the solvent to obtain white hybrid powder for later use; and (3) putting the white powder prepared by the step (2) in a tubular furnace, calcining at 900-1000 DEG C for 5 hours, then calcining at 700 DEG C for 2hours in a muffle furnace to obtain a product which is high-crystallization boron nitride. By virtue of the application of the surfactant-assisted synthesis method, the crystallization degree of boron nitride is remarkably improved; the crystallization temperature of boron nitride is reduced; the cost is reduced; the energy consumption is reduced.

Description

Technical field [0001] The technical scheme of the present invention belongs to boron nitride materials, and relates to a method for preparing boron nitride with high crystallinity. Background technique [0002] Boron nitride has many structures, such as hexagonal boron nitride (h-BN), cubic boron nitride (c-BN), trigonal boron nitride (r-BN) and so on. Among them, hexagonal boron nitride is widely used in electronics, casting and other industries due to its excellent physical and chemical properties, especially excellent dielectric properties, dielectric frequency stability and high thermal conductivity. It is used to produce solid lubricants, Composite ceramics, electrical insulation, daily cosmetics and other important raw materials have high application value and have become a hot spot for scholars at home and abroad. In recent years, researchers at home and abroad have studied the preparation method of h-BN in depth, but the traditional preparation method of boron nitride i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064
Inventor 刘超刘超亚纪秀杰李佳吴芳芳谭宏亮唐成春王虹武雅静陈翠红
Owner HEBEI UNIV OF TECH
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