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 and boron. 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 nitride to begin oxidizing. 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 only slightly soluble in acidic water and not at all in 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 powder is usually a white graphite with a graphite structure. Another type is diamond. 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.

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. The use of catalysts was found to 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 the preparation of cubic boron (CBN), at low temperature, and under low pressure. Equipment is easy to use and the process can be easily realized, so this technology has developed rapidly.

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.

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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