The Property And Preparation of Boron Nitride Powder

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Boron nitride The powder is white and is a crystal made up of nitrogen atoms. The chemical composition of the powder is a mixture of boron and nitrogen (43.6%). There are four types: hexagonal Boron Nitride (HBN), Rhombohedral Boron Nitride (RBN), Cubic boron Nitride (CBN), or wurtzite Nitro Boron (WBN).

What property does boron nitride have?

Boron Nitride Powder is resistant against chemical corrosion. It is also not affected by water or mineral acids. The boron and nitrogen bond is broken by hot concentrated alkali. The air temperature above 1200degC causes the nitride to begin oxidizing. It melts at 3000degC and begins to sublime slightly below 3000degC. Decomposition begins in vacuum around 2700degC. Boron Nitride Powder is slightly soluble when heated acid is used, but insoluble with cold water.
Carbon materials are inferior in terms of most properties to boron carbide. For hexagonal Boron Nitride: Low friction coefficient, Good high temperature stability and Thermal shock Resistance, High Strength, High Thermal Conductivity, Low Expansion Coefficient, High Resistivity, Corrosion resistance, Microwave or Transparent Infrared.

What are the different methods of preparation for boron nitride?

The boron-nitride is commonly produced as a powder with a structure similar to graphite, also known as white graphite. The second is diamond type. Similar to the conversion of graphite to a diamond, graphite boron-nitride powder can be converted into diamond boron-nitride powder under high temperature and pressure.

High Temperature and High Pressure Synthesis
Wentorf produced cubic BN first in 1957. The cubic boron nitride can be directly converted from pure hexagonal boron nitride, HBN, when the pressure and temperature are high enough. Subsequently it was found that the use catalysts can reduce the transition pressure and temperature. The high cost of preparation and the complexity of equipment limit its industrial use.

Chemical vapor synthesis
Sokolowski was the first to use pulsed-plasma technology in 1979 for preparing cubic boron (CBN), at low temperature, and under low pressure. Equipment is simple, and the process can be easily realized.

Technology for carbothermic synthesis
The method is based on using boric acid, a raw material, as an additive to silicon carbide. Ammonia nitriding then produces boron oxide. The resultant product has a high purity, and is a valuable material for composite materials.

Ion beamsputtering
The mixed product is made using particle beam deposition. It is possible to achieve a product with a morphology that is controlled, even though this method contains fewer impurities.

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