Boron Nitride Powder Properties And Applications

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Boron nitride 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 does no corrode. 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 slightly soluble when heated acid is used, but insoluble with cold water.

Compared to carbon materials, boron nitride has better properties. 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, with a graphite structure. There are also amorphous variations.

Boron nitride Powder Applications

Cubic-boron nitride has a high heat resistance in addition to its excellent wear resistance. It can cut heat resistant steels, ferroalloys or hardened steels. 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 6.4 eV), semiconductor material, cubic boron nitride is characterized by high thermal conductivity. Also, it has high resistance, good mobility, low dielectric, and high breakdown electric fields. 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. They are more mobile, have a greater breakdown electric field, and have a lower dielectric constant. Diamond and cBN are superior materials for extreme electronics.

Due to its high hardness, cubic-boron film is ideal for optical applications. Its high transmittance over the entire range of wavelengths from ultraviolet (approximately at 200 nm), to far infrared makes it suitable as a coating of window materials, such as zinc selenide(ZnSe) or zinc sulfide(ZnS).

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