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Boron nitride The powder is white and is made up of boron and 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 mineral acid or water. The boron and nitrogen bond is broken by hot concentrated alkali. The air temperature above 1200degC causes the boron-nitrogen bond to break. Its melting point, 3000degC. When it’s slightly below 3000degC it begins to sublime. And it begins decomposing at around 2700degC under vacuum. Boron Nitride Powder is slightly soluble and insoluble in acidic 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?

Usually produced boron nitride has a white graphite structure. The second is diamond type. Similar to the process of converting diamond to graphite, high-temperature and high-pressure can convert graphite type to diamond type.

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 using catalysts greatly reduced 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 the preparation of 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 is then used as the reducing agent. The resultant product is highly pure and suitable for preparing composite materials.

Ion beams sputtering
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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