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The first application of hexagonal boron nitride was as a high-temperature lubricant. As a high-temperature grease, hexagonal boron was the first application. White graphite is a common name because of its similarity to graphite in terms of both its structure and properties.
Boron Nitride Powder Properties
Boron Nitride is resistant to corrosion by chemicals and mineral acids. It is also not affected by water and mineral acid. The boron and nitrogen bond is broken by hot concentrated alkali. Boron Nitride begins to oxidize at temperatures above 1200degC. It decomposes around 2700degC in vacuum. Boron Nitride is soluble only in warm acid, but insoluble in cold waters.
Most properties of boron materials are better than those of carbon materials. The following properties are found in hexagonal boron Nitride: Low friction coefficient; good high temperature stability; good thermal shock resistance; high strength; high thermal conductivity.
The most common boron system is hexagonal, but there are many other forms, such as: Cubic boron (cBN), Wurtzite boron (wBN).
Boron nitride Powder Applications
Cubic-boron nitride has excellent heat resistance in addition to its excellent wear resistance. It can cut heat resistant steel, ferroalloys and hardened metals. At a relatively high temperature, it can cut Si-Al and Si-Cr alloys and chilled rolls with high hardness.
As a wide-band-gap (band-gap of 6.4eV) semiconductor, cubic-boron has high thermal conduction, high resistivity. high mobility. low dielectric constant. high breakdown electric field. They all share a wide band-gap, which makes them ideal for electronics that operate in extreme environments.
In comparison with SiC or GaN, diamond and cubic boron nitride have superior properties. These include a wider band gap and greater mobility. Diamond and cBN are superior materials for extreme electronics.
Due to its high hardness, cubic-boron film is suitable for optical applications. Its high transmittance over the entire range of wavelengths from ultraviolet (approximately at 200 nm), to far infrared makes it a good surface coating on some optical components.
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