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

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...

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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

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