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The powder is white and is a crystal made up of nitrogen 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. 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 starts to sublime. And it begins decomposing at around 2700degC under vacuum. Boron Nitride Powder is soluble only in hot acids and not in cold water.
Carbon materials are inferior in terms of most properties to boron carbide. For hexagonal Boron Nitride: Low friction coefficient, high strength and thermal conductivity.
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 pressure and temperature.
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. The use of catalysts was found to reduce both the temperature and the pressure required for the transition. 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.
Carbothermic Synthesis Technology
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.
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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