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The Property And Preparation of Boron Nitride Powder

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Update time : 2021-02-22 09:29:28
Boron nitride powder is white color, it is a crystal composed of nitrogen atoms and boron atoms. The chemical composition is 43.6% boron and 56.4% nitrogen, with four different variants: hexagonal boron nitride (HBN), rhombohedral boron nitride (RBN), cubic boron nitride (CBN) and wurtzite nitrogen Boron (WBN).

What is the property of boron nitride powder?

Boron nitride powder is resistant to chemical corrosion and is not corroded by mineral acids and water. The boron-nitrogen bond is broken in hot concentrated alkali. Boron nitride begins to oxidize in the air above 1200°C. Its melting point is 3000°C, and it begins to sublime when it is slightly lower than 3000°C, and it begins to decompose at about 2700°C in vacuum. Boron nitride powder is slightly soluble in hot acid and insoluble in cold water.

Most of the properties of boron carbide powder are better than carbon materials. For hexagonal boron nitride: low friction coefficient, good high temperature stability, good thermal shock resistance, high strength, high thermal conductivity, low expansion coefficient, high resistivity, corrosion resistance, microwave or transparent Transparent infrared.

 
 

What is the preparation method of boron nitride powder?

The boron nitride powder usually produced has a graphite-type structure, commonly known as white graphite. The other is diamond type, similar to the principle of converting graphite to diamond, graphite type boron nitride can be converted to diamond type boron nitride under high temperature and high pressure.

High temperature and high pressure synthesis
In 1957, Wentorf synthesized cubic BN for the first time. When the temperature is close to or higher than 1700°C and the min pressure is 11-12GPa, pure hexagonal boron nitride (HBN) is directly transformed into cubic boron nitride (CBN). Subsequently, it was discovered that the use of catalysts can greatly reduce the transition temperature and pressure. Due to the complex equipment and high cost of its preparation, its industrial application is limited.

Chemical vapor synthesis
In 1979, Sokolowski successfully used pulsed plasma technology to prepare cubic boron nitride (CBN) films at low temperature and low pressure. The equipment used is simple and the process is easy to realize, so it has been developed rapidly.

Carbothermic synthesis technology
The method uses boric acid as a raw material on the surface of silicon carbide, carbon as a reducing agent, and ammonia nitriding to obtain boron nitride. The resulting product has high purity and has great application value for the preparation of composite materials.

Ion beam sputtering
Using particle beam sputtering deposition technology, a mixed product of cubic boron nitride and hexagonal boron nitride is obtained. Although this method has fewer impurities, it is difficult to control the reaction conditions, so the morphology of the product is difficult to control, and the research on this method has great potential for development.

Luoyang Trunnano Tech Co., Ltd (TRUNNANO) is a professional boron nitride powder with over 12 years experience in chemical products research and development. If you are looking for high quality boron nitride powder, please feel free to contact us and send an inquiry.

 
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