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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), and 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 nitride to begin oxidizing. Its melting temperature is 3000degC. It begins to sublime at a slightly lower temperature than 3000degC. And it starts decomposing in vacuum around 2700degC. 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 of boron is usually a white graphite with a graphite structure. 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. Later, it was found that the use catalysts can reduce both 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 temperatures, and under low pressure. Equipment is simple, and the process can be easily realized.
Carbothermic Synthesis Technology
The method is based on using boric nitride as the boron nitride. It uses ammonia to nitride the silicon carbide surface, with carbon acting as a reduction agent. 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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