Boron nitride came out more than 100 years ago. The earliest application was hexagonal boron nitride as a high-temperature lubricant. Not only its structure but also its properties are very similar to graphite, and its own whiteness, so it is commonly known as: white graphite.
Boron Nitride Powder Properties
Boron nitride is resistant to chemical corrosion and is not corroded by mineral acids and water. The boron-nitrogen bond is broken in hot concentrated alkali. Boron nitride begins to oxidize in the air above 1200°C, and decomposes at about 2700°C under vacuum. Boron nitride is slightly soluble in hot acid and insoluble in cold water.
Most of the properties of boron nitride are better than carbon materials. For hexagonal boron nitride: low friction coefficient, good high temperature stability, good thermal shock resistance, high strength, high thermal conductivity, low expansion coefficient, high resistivity, corrosion resistance, microwave or transparent Infrared.
Boron nitride is a hexagonal crystal system, the most common is graphite lattice, there are also amorphous variants, in addition to the hexagonal crystal form, there are other crystal forms of boron nitride, including: rhombohedral boron nitride (r-BN), Cubic boron nitride (c-BN), wurtzite type boron nitride (w-BN).
Boron Nitride Powder Applications
In addition to excellent wear resistance, cubic-boron nitride also has excellent heat resistance. It can also cut heat-resistant steel, ferroalloys, hardened steel, etc. at a relatively high cutting temperature, and can cut high-hardness chilled rolls and infiltration carbon quenching materials and Si-Al alloys which are very serious for tool wear.
As a wide band gap (band gap of 6.4 eV) semiconductor material, cubic-boron nitride has high thermal conductivity, high resistivity, high mobility, low dielectric constant, high breakdown electric field, can achieve dual-type doping and has good It is called the third-generation semiconductor material after Si, Ge and GaAs together with diamond, SiC and GaN. Their common feature is the wide band gap, which is suitable for the production of electronic devices used under extreme conditions.
Compared with SiC and GaN, cubic-boron nitride and diamond have more excellent properties, such as wider band gap, higher mobility, higher breakdown electric field, lower dielectric constant and higher thermal conductivity. Obviously as extreme electronics materials, c-BN and diamond are better.
In terms of optical applications, due to the high hardness of cubic-boron nitride film and the high transmittance of the entire wavelength range from ultraviolet (approximately from 200 nm) to far infrared, it is suitable as a surface coating for some optical components, especially as Coating of window materials such as zinc selenide (ZnSe) and zinc sulfide (ZnS).
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