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Hexagonal nanometer boron nitride microsphere and its synthesis process and application

A technology of hexagonal boron nitride and boron nitride microspheres, applied in chemical instruments and methods, boron compounds, inorganic chemistry and other directions, can solve the problems of uncontrollable microscopic morphology, complex synthesis process and high cost, and achieves simple and High purity, no jamming load improvement effect

Inactive Publication Date: 2007-03-21
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The boron nitride obtained by the above synthesis method is an irregular powder material, and its microscopic morphology is uncontrollable
Moreover, some synthetic processes are more complicated, the yield is lower, and the cost is higher.

Method used

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  • Hexagonal nanometer boron nitride microsphere and its synthesis process and application
  • Hexagonal nanometer boron nitride microsphere and its synthesis process and application
  • Hexagonal nanometer boron nitride microsphere and its synthesis process and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1. Follow the reaction equation:

[0040]

[0041] Weigh the raw materials according to the molar ratio of boron oxide and monohydric alcohol as 1:3, and slowly add boron oxide to the monohydric alcohol in fractions under stirring (methanol is the best monohydric alcohol, followed by ethanol, propanol, etc. If the carbon content is too high, it is easy to generate amorphous carbon in the follow-up nitriding reaction and make the product impurities too much. The following are all represented by methanol), until boron oxide is completely reacted with methanol to obtain a clear solution;

[0042] Step 2. Connect the synthesis device as shown in Figure 1. Tube furnaces use corundum tubes. Under the condition of ensuring airtightness, turn the switch to the point where the nitrogen gas only leads to the raw material container, and the air in the container is exhausted, and the amount of nitrogen passing through is 5 times the volume of the air in the container; ...

Embodiment 2

[0046] Step 1. Follow the reaction equation:

[0047]

[0048] Weigh the raw materials according to the molar ratio of boron oxide and monohydric alcohol as 1:3, and slowly add boron oxide to methanol several times under stirring until the boron oxide completely reacts with methanol to obtain a clear solution;

[0049] Step 2. Connect the synthesis device as shown in Figure 2. The tube furnace uses a corundum tube. Under the condition of ensuring airtightness, turn the three-way switch so that the nitrogen gas only leads to the raw material container, and the air in the container is exhausted. , the volume of the nitrogen gas is 5 times the volume of the air in the container; then the three-way switch tube is screwed so that the nitrogen gas only leads to the reactor, and the air is exhausted, and the volume of the nitrogen gas is 5 times the volume of the reaction container. ;Continue to pass a small amount of nitrogen, so that the tube furnace is under the protection ...

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Abstract

The present invention is hexagonal nanometer boron nitride microsphere and its synthesis process and application. The hexagonal nanometer boron nitride microsphere is laminated structure of 30-150 nm diameter and with 30-50 nm diameter fraction not less than 60 %. The preparation process includes the esterification between boron oxide and monobasic alcohol to produce the mixture of trihydroxy boric acid ester and boric acid, carrying the mixture into nitriding furnace to react with excessive ammonia at high temperature, and washing the reaction product with methanol to eliminate boron oxide to obtain hexagonal nanometer boron nitride microsphere. The preparation process is simple, reliable, low in cost and suitable for large scale production, and the synthesized hexagonal nanometer boron nitride microsphere has high purity and is used as lubricant.

Description

technical field [0001] The invention relates to a method for synthesizing hexagonal boron nitride (h-BN) nanospheres and its application. Background technique [0002] The solid lubricants commonly used at present mainly include graphite and molybdenum disulfide and a small amount of organic solid lubricants. Usually used under high temperature and high load conditions. However, due to the limitations of the physical and chemical properties of such solid lubricants, their application range is affected to a certain extent. For example, the use temperature of graphite cannot exceed 450°C, the use temperature of molybdenum disulfide cannot exceed 400°C, and so on. [0003] Hexagonal boron nitride has a graphite-like layered structure, its physical and chemical properties are similar to graphite, and its lubricity and thermal conductivity are good. Therefore, it is called "white graphite". The properties of hexagonal boron nitride are: melting point 3000°C (decomposition), s...

Claims

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Application Information

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IPC IPC(8): C01B35/14
Inventor 唐成春丁晓夏高建明祁守仁
Owner HUAZHONG NORMAL UNIV
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