Method for preparing hexagonal boron nitride nano composite structure

A nano-composite, boron nitride micro technology, applied in nitrogen compounds, chemical instruments and methods, nanotechnology and other directions, can solve the problems of low product purity, low product yield, coexistence of impurities, etc., to achieve high purity, large product yield, Even diameter effect

Inactive Publication Date: 2013-04-17
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Hexagonal boron nitride has no obvious melting point. It sublimes at 3000°C in 0.1MPa nitrogen, and has a melting point of 3000°C in inert gas. , Poor stability in oxygen atmosphere, use temperature below 1000℃
[0014] However, in the current prior art, a large number of synthetic methods have been used for the synthesis of boron nitride nanostructures, for example, metal-catalyzed method, carbothermal reduction method, pyrolysis method, ball milling-a

Method used

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  • Method for preparing hexagonal boron nitride nano composite structure
  • Method for preparing hexagonal boron nitride nano composite structure
  • Method for preparing hexagonal boron nitride nano composite structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] First, 2.23 grams of boron powder with a purity of 96.7% and 2.74 grams of FeCl 3 ·6H 2 O was evenly dispersed and dissolved in 5 ml of absolute ethanol, stirred for 1 hour with a magnetic stirrer to remove the ethanol solvent, and a paste mixture was obtained. Put the paste mixture into an alumina porcelain boat, and then put the alumina porcelain boat into a high-temperature tubular atmosphere furnace. Seal the high-temperature tubular atmosphere furnace, evacuate its internal space, and then introduce high-purity ammonia gas with a flow rate of 50 sccm and a purity of 95.9%, and raise the furnace temperature to 1300°C at a heating rate of 10°C / min, and keep it for 5 Hours, heat preservation ends. Then, under the protection of flowing high-purity nitrogen with a purity of more than 99.9%, the porcelain boat was naturally cooled to room temperature, and the porcelain boat was taken out to obtain a white powder, which was tested. It can be seen from the infrared spec...

Embodiment 2

[0054] First, 1.10 g of amorphous boron powder with a purity of 98% and 2.93 g of Fe 2 (SO 4 ) 3 9H 2 O was uniformly dispersed and dissolved in 10 ml of absolute ethanol, stirred for 2 hours with a magnetic stirrer to remove the ethanol solvent, and a paste mixture was obtained. Put the paste mixture into an alumina porcelain boat, and then put the alumina porcelain boat into a high-temperature tubular atmosphere furnace. Seal the high-temperature tubular atmosphere furnace, evacuate its internal space, and then introduce high-purity ammonia gas with a flow rate of 150 sccm and a purity of 95.9%, and raise the furnace temperature to 1300 °C at a heating rate of 5 °C / min, and keep it for 3 Hour. After the heat preservation is over, under the protection of flowing high-purity neon gas with a purity of more than 99.9%, the porcelain boat is naturally cooled to room temperature, and the porcelain boat is taken out to obtain a white powder, which is tested. It can be seen fro...

Embodiment 3

[0056] First, 1.20 g of amorphous boron powder with a purity of 90% and 4.04 g of Fe(NO 3 ) 3 9H 2 O was uniformly dispersed and dissolved in 15 ml of absolute ethanol, stirred for 4 hours using a magnetic stirrer to remove the ethanol solvent, and a paste mixture was obtained. Put the paste mixture into the alumina porcelain boat, and then put the alumina porcelain boat into the high-temperature tubular atmosphere furnace; seal the high-temperature tubular atmosphere furnace, evacuate its inner space, and then pass it in at a flow rate of 25 sccm, the purity Use 95.9% high-purity ammonia as protective gas, raise the furnace temperature to 1300°C at a heating rate of 15°C / min, and keep it warm for 8 hours. , the porcelain boat was naturally cooled to room temperature, and the porcelain boat was taken out to obtain a pure white powder, which was detected from the infrared spectrum. It can be seen that the obtained product is pure boron nitride; it can be further determined fr...

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Abstract

As an important III-V main group compound, hexagonal boron nitride (h-BN) has multiple excellent physical and chemical properties, such as high-temperature resistance, oxidation resistance, corrosion resistance, self-lubrication and high thermal conductivity, and can be widely used in the fields of chemical industry, machinery, electronics, aerospaces, and the like. In recent years, a research on BN is relatively focused on BN nanotubes; by contrast, the research on BN nanowires is little, and a report on relevant BN micro-nano composite structures is rarer. The novel BN micro-nano composite structure is synthesized by taking amorphous boron powder, ferric chloride hexahydrate, absolute ethyl alcohol, high-purity nitrogen and liquid ammonia as raw materials. The synthetic method is simple in technology; the raw materials are nontoxic, environment-friendly and low in cost; the product purity is high; the yield is high; no purification is required; and scale production is facilitated. In addition, the novel BN micro-nano composite structure has a very high specific surface area, and has very wide development and application prospects in the fields of catalyst carrier materials, novel energy storage materials, ceramic compound materials and polymer composites.

Description

technical field [0001] The invention relates to a method for preparing a boron nitride micro-nano composite structure, in particular to a method for preparing a hexagonal boron nitride micro-nano composite structure. Background technique [0002] Boron Nitride (Boron Nitride molecular formula BN, molecular weight 24.81, theoretical density 2.27g / cm 3 ) is a substance composed of nitrogen atoms and boron atoms. The chemical composition is 43.6% boron and 56.4% nitrogen, and crystalline BN has four structures: hexagonal boron nitride (h-BN), rhombohedral boron nitride (r-BN), cubic boron nitride (c-BN ) and close-packed hexagonal boron nitride (w-BN / wurtzite boron nitride). [0003] Hexagonal boron nitride has no obvious melting point. It sublimes at 3000°C in 0.1MPa nitrogen, and has a melting point of 3000°C in inert gas. , Poor stability in oxygen atmosphere, use temperature below 1000℃. Hexagonal boron nitride is insoluble in cold water. When the water is boiled, it hy...

Claims

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Application Information

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IPC IPC(8): C01B21/064B82Y30/00B82Y40/00
Inventor 陈拥军李娟闭晓帆
Owner GUANGXI UNIV
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