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Boron nitride The powder is a white crystal made up of nitrogen and boran atoms. The chemical composition of the powder is 43.6% nitrogen and 56.4% boron. There are four different 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. In concentrated hot alkali the boron and nitrogen bond is broken. The air temperature above 1200degC causes the boron-nitrogen bond to break. Its melting temperature is 3000degC. It begins to sublime at a slightly lower temperature than 3000degC. And it begins decomposing in vacuum at 2700degC. Boron Nitride Powder is soluble in warm acid but insoluble in cold.
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 nitride. The second is diamond type. Similar to the conversion of graphite to a diamond, graphite boron-nitride powder can be converted into diamond type boron-nitride by high temperature and pressure.

Synthesis of high temperature and high pressure
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. It was found that catalysts reduce both the transition pressure and temperature. The high cost and complexity of the equipment required to prepare it 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 temperatures, 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 is highly pure and suitable for the preparation 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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