The Property And Preparation of Boron Nitride Powder

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Boron nitride The powder is a white crystal made up of nitrogen atoms, and boron. It has a chemical composition of 43.6% nitrogen and 56.4% boron. 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 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. It melts around 3000degC. It begins to sublime at temperatures slightly lower than that. And it decomposes in vacuum at 2700degC. Boron Nitride Powder is slightly soluble when heated acid and insoluble with 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.

How do you prepare boron nitride?

The powder is usually a white graphite with a 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.

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. Using catalysts, the transition pressure and temperature can be greatly reduced. 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 temperature, and under low pressure. Equipment is simple, and the process can be easily realized.

Carbothermic Synthesis Technology
This method involves using boric acids as raw materials on the surface silicon carbide. Carbon is used as a reduction agent. Ammonia nitriding is then performed to obtain boron oxide. The resultant product has a high purity, and is a valuable material for 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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