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Preparation method of vertically-arranged boron nitride nanosheet film and material with surface provided with vertically-arranged boron nitride nanosheet film

A vertical arrangement, boron nitride technology, applied in the field of nanomaterials, can solve the problems of cumbersome preparation process, poor product weather resistance, harsh conditions, etc., and achieve the effects of wide source, low price, energy consumption and production cost reduction

Active Publication Date: 2021-01-29
ROCKET FORCE UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the cumbersome preparation process, harsh conditions, and poor weather resistance of the product, there are certain limitations in actual production and application.

Method used

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  • Preparation method of vertically-arranged boron nitride nanosheet film and material with surface provided with vertically-arranged boron nitride nanosheet film
  • Preparation method of vertically-arranged boron nitride nanosheet film and material with surface provided with vertically-arranged boron nitride nanosheet film
  • Preparation method of vertically-arranged boron nitride nanosheet film and material with surface provided with vertically-arranged boron nitride nanosheet film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In step (1), boron oxide and metal iron powder are mixed according to the molar ratio of 1:1, placed in a ball mill tank, and nitrogen gas is introduced after vacuumizing, and the ball mill is used for 4 hours to obtain a uniformly mixed Solid powder, the particle size is about 2-10 microns.

[0036] In step (2), the solid powder obtained in step (1) is placed in a square porcelain boat, and a 30mm×30mm Al 2 o 3 Place the ceramic substrate in the middle position, place the ceramic boat in a tube-type atmosphere protection annealing furnace, start heating from normal temperature under the protection of 100ml / min argon, the heating rate is 10°C / min, and the temperature rises to 300 Close the argon valve at ℃, feed high-purity ammonia gas, the flow rate is 200ml / min, keep warm for 2 hours when the temperature further rises to 1250 ℃, then stop feeding ammonia gas, and then cool down to room temperature naturally under a protective atmosphere. An off-white substance is de...

Embodiment 2

[0048] Change step (2) reaction temperature into 1225 DEG C among the embodiment 1, other each operation is all identical with embodiment 1, in Al 2 o 3 A large number of dense BN nanosheets grow on the surface of the ceramic substrate. The SEM photo shows that its morphology is the same as in Example 1. Tests show that the resulting Al covered with BN nanosheets 2 o 3 The contact angle of the ceramic substrate is 144°, which has excellent hydrophobic properties.

Embodiment 3

[0050] Change step (2) reaction temperature into 1275 DEG C among the embodiment 1, other each operation is all identical with embodiment 1, in Al 2 o 3 A large number of dense BN nanosheets grow vertically on the surface of the ceramic substrate. The SEM photo shows that its morphology is the same as in Example 1. Tests show that the obtained Al with BN nanosheets grown on the surface 2 o 3 The contact angle of the ceramic substrate is 146°, which has excellent hydrophobic properties.

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Abstract

The invention discloses a preparation method of a vertically-arranged boron nitride nanosheet film and a material with the surface provided with the vertically-arranged boron nitride nanosheet film. The method comprises the following steps: mixing cheap boron oxide powder as a boron source with metal iron powder and magnesium powder, carrying out ball milling for 0.5 h or more to prepare a reaction precursor, taking metal , ceramic, silk screen, and porous ceramic as deposition substrates, heating to 1200-1300 DEG C in a high-purity ammonia atmosphere by using a tubular atmosphere protection annealing furnace, and carrying out heat preservation for 1-8 h, so that a layer of off-white BN nanosheet film is deposited on the surface of the substrate, the contact angle of the film to water is 144-146 degrees, and the hydrophobic property is good. The invention can be applied to the fields of self-cleaning surfaces, self-lubricating surfaces, metal protection, oil-water separation and the like, especially high-temperature corrosive environments. The preparation process is simple, the reaction conditions are mild, and the used raw materials are boron oxide powder, iron powder, magnesium powder and ammonia gas, are cheap, easy to obtain, non-toxic and harmless, and are suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a preparation method of a vertically arranged boron nitride nanosheet thin film and a material on which the thin film is arranged on the surface. Background technique [0002] The molecular formula of boron nitride is BN, which is a graphite-like layered structure 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. BN nanosheet film is a kind of BN nanofilm with dense BN nanosheets grown vertically on the surface of ceramic or metal substrates, screens or porous materials. Due to the existence of a large number of BN nanosheets on its surface, dense nano-scale small protrusions are formed on the surface of the substrate, which increases its specific surface area and surface roughness, so that it has good adsorption and hydrophobic properties. At the sam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87B01J20/02B01J20/28B01J20/32
CPCB01J20/0259B01J20/28007B01J20/28026B01J20/32B01J20/3214B01J20/3234B01J20/3291C04B41/009C04B41/5064C04B41/87C04B41/455C04B41/4519C04B41/4531C04B35/10
Inventor 李艳娇刘彬郭剑锋王鑫峰候立安
Owner ROCKET FORCE UNIV OF ENG
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