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A method and device for preparing boron nitride spherical powder in high-pressure gas phase

A spherical powder, boron nitride technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of low yield and long synthesis time, and achieve low synthesis temperature, short synthesis time and high yield. Effect

Active Publication Date: 2019-05-31
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, methods for preparing boron nitride spheres under the high-pressure conditions presented here have not been reported, and the current methods for synthesizing boron nitride spheres were not about 40% lower in yield [16] , high impurity content [13,14] or synthesis time up to 24 hours [15]

Method used

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  • A method and device for preparing boron nitride spherical powder in high-pressure gas phase
  • A method and device for preparing boron nitride spherical powder in high-pressure gas phase
  • A method and device for preparing boron nitride spherical powder in high-pressure gas phase

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Implementation example 1: Fabrication of reaction device

[0069] This example shows the fabrication of the reaction device. The specific process is as follows:

[0070] The reaction device mainly includes a reaction chamber, a sealing ring and a fastening screw. The reaction chamber is made of high temperature and high pressure resistant materials, including one of alumina ceramics, zirconia ceramics and tungsten molybdenum metals. The reaction chamber includes upper and lower parts, and a sealing ring can be placed in the middle. The sealing ring is a kind of copper, molybdenum and graphite sealing ring, and the fastening screw is a high temperature resistant material, including a kind of molybdenum metal and special high temperature alloy. The reaction chamber is divided into upper and lower parts, four through holes are punched in the upper and lower parts, and the reaction container is dug out in the lower part, the sealing ring is placed in the middle of the upper and...

Embodiment 2

[0071] Implementation Example 2: Preparation of alumina ceramic reaction chamber on boron nitride balls

[0072] This example shows the preparation of boron nitride balls with alumina ceramic reaction chamber. The specific preparation process is as follows:

[0073] Under the conditions that the mass ratio of the precursor to the volume of the reaction chamber is 0.1g / ml, the heating rate is 10°C / min, the holding time is 1h, and the reaction temperature is 200°C, the molybdenum metal seal ring is selected and the molybdenum metal screw is fastened. Prepare boron nitride balls.

[0074] figure 2 This is the SEM image of the boron nitride ball obtained in the alumina ceramic reaction chamber.

[0075] From figure 2 It can be seen that the boron nitride balls have been formed, and the size distribution is 0.5-2μm.

Embodiment 3

[0076] Implementation Example 3: Preparation of boron nitride balls by molybdenum metal reaction chamber

[0077] This example shows the preparation of boron nitride balls by the molybdenum metal reaction chamber. The specific preparation process is as follows:

[0078] Under the conditions that the mass ratio of the precursor to the volume of the reaction chamber is 0.1g / ml, the heating rate is 10°C / min, the holding time is 1h, and the reaction temperature is 200°C, the copper metal sealing ring is selected and the molybdenum metal screw is fastened. Prepare boron nitride balls.

[0079] image 3 It is the SEM image of the boron nitride ball obtained in the molybdenum metal reaction chamber.

[0080] From image 3 It can be seen that the boron nitride spheres have been formed and the size distribution is 0.6-1.8 μm.

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Abstract

The invention relates to a method and an apparatus for high pressure gas phase preparation of boron nitride spherical powder. According to the present invention, an easily-evaporated or easily-decomposed substance containing boron and nitrogen is used as a reaction precursor, the solid or liquid of the substance is sealed in a reaction apparatus, the reaction apparatus is placed in a suitable heating furnace, heating is performed at a suitable temperature in a protective atmosphere to make the precursor be evaporated or decomposed to produce a high pressure, and boron nitride spheres are successfully prepared under the action of the high pressure; the used reaction apparatus comprises a reaction chamber, a sealing ring and a fastening screw; the method has advantages of simple process, low cost, low synthesis temperature, short time and high yield (more than 99%), and can prepare a lot of boron nitride spheres; and the obtained boron nitride spheres have characteristics of low specific surface area (1.12 m<2> / g) and high oxidation resistance, and have the oxidation initiation temperature of 895 DEG C, such that the boron nitride spheres can have good application prospects in lubricants, polymers and ceramic composite materials.

Description

Technical field [0001] The patent of the invention relates to a method and device for preparing boron nitride spherical powder in a high-pressure gas phase, and belongs to the technical field of new materials. Background technique [0002] Hexagonal boron nitride (h-BN) has received considerable attention in the past decades due to its unique properties, including wide band gap [1] , High thermal stability [2] , Excellent chemical inertness [3] , High mechanical strength [4] , High thermal conductivity, high temperature resistance, low dielectric coefficient [5] , High hardness (15-24kg·mm -2 ), high corrosion resistance [6] , Outstanding high temperature oxidation resistance [7] , Higher tensile and impact strength [8] And other performance. All these properties make it have a wide range of applications in many aspects, including catalysts [9] , Electronic devices [3] , Far ultraviolet device [10] , Single photon emitter [11] And field effect transistors [12] Until now, h-BN mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064
CPCC01B21/0646C01P2002/72C01P2002/88C01P2004/03C01P2004/32C01P2004/61C01P2004/62C01P2006/12
Inventor 于杰韩美胜
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL