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Preparation method of wooden club-shaped short boron nitride nanotube

A technology of boron nitride nanotubes and mallets, which is applied in chemical instruments and methods, nitrogen compounds, nanotechnology, etc., to achieve the effects of easy dispersion and uniformity, not easy winding and agglomeration, and improving mechanical properties

Active Publication Date: 2022-05-24
中国人民解放军火箭军工程大学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Short BN nanotubes with a length of less than 5 μm have not been reported, nor have mallet-shaped BN nanotubes been reported.

Method used

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  • Preparation method of wooden club-shaped short boron nitride nanotube
  • Preparation method of wooden club-shaped short boron nitride nanotube
  • Preparation method of wooden club-shaped short boron nitride nanotube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1: Mix boron oxide and magnesium metal powder in a molar ratio of 1:2, place them in a planetary ball mill, and then perform ball milling in a nitrogen protective atmosphere for 4 hours by alternating forward and reverse rotation to obtain particles with a particle size of 2 μm to 10 μm. solid powder;

[0031]Step 2, place the solid powder obtained in step 1 in a porcelain boat, and place a 30mm×30mm (length×width) nickel-chromium alloy wire mesh with an iron content of 0.7wt% on the upper central position of the porcelain boat, and then Under the protection of argon gas with a flow rate of 20mL / min, close the argon valve when the temperature rises from room temperature to 1300°C at a rate of 10°C / min, and feed ammonia gas with a mass purity of 99.99% at a flow rate of 150mL / min and keep it for 6 hours. Ammonia gas is introduced, and then the temperature is naturally cooled to room temperature under a protecti...

Embodiment 2

[0041] The difference between this example and Example 1 is that the temperature is raised to 1250° C. in step 2.

Embodiment 3

[0043] The difference between this example and Example 1 is that the temperature is raised to 1350° C. in step 2.

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Abstract

The invention discloses a preparation method of a club-shaped short boron nitride nanotube. The method comprises the following steps: 1, mixing and ball-milling boron oxide and metal magnesium powder to obtain solid powder; and 2, putting the solid powder into a porcelain boat, putting a nickel-chromium alloy wire mesh with low iron content on the porcelain boat, heating to 1250-1350 DEG C under the protection of argon, introducing high-purity ammonia gas for heat preservation, and depositing to obtain the wooden club-shaped short boron nitride nanotube. Boron oxide and magnesium powder are subjected to ball milling activation and then catalyzed at a high temperature to generate B2O2 gas, the B2O2 gas is diffused to a nickel-chromium alloy wire mesh and reacts with ammonia gas to generate the BN nanotube, the growth speed of the BN nanotube generated through catalysis is controlled through the low iron content of the nickel-chromium alloy wire mesh, and it is guaranteed that the club-shaped short boron nitride nanotube is obtained in combination with a gas-liquid-solid growth mechanism; the product is easily and uniformly dispersed as an additive, effectively improves the performance of a composite material matrix, and is suitable for the fields of high-performance structural materials and functional materials for equipment and machinery.

Description

technical field [0001] The invention belongs to the technical synthesis field of hexagonal boron nitride micro-nano materials, and particularly relates to a preparation method of a rod-shaped short boron nitride nanotube. Background technique [0002] The molecular formula of boron nitride is BN, which is a graphite-like layered material composed of nitrogen (N) atoms and boron (B) atoms. BN nanomaterials refer to BN materials with at least one dimension in the nanoscale range in three-dimensional space. Due to the small size effect, BN nanomaterials have good mechanical properties, high thermal conductivity, remarkable electrical insulation, excellent chemical stability and excellent oxidation resistance of bulk BN materials. Such as high specific surface area, good adsorption and so on. These unique properties make BN nanomaterials have good application prospects in the fields of biological probes, optoelectronic instruments, humidity sensing, and hydrogen storage media,...

Claims

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Application Information

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IPC IPC(8): C01B21/064B82Y40/00
CPCC01B21/064B82Y40/00C01P2004/62C01P2004/64C01P2004/61C01P2004/13
Inventor 李艳娇郭剑锋吕秋娟王学仁芦静
Owner 中国人民解放军火箭军工程大学