Differences between hexagonal boron nitride and cubic boron nitride
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Author : trunnano
Update time : 2022-07-29 16:41:08
Boron nitride ceramic is a kind of thermally and chemically stable refractories, which is composed of boron and nitrogen. Boron nitride mainly exists in three crystal forms: hexagonal boron nitride (h-BN), cubic boron nitride (c-BN) and wurtzite boron nitride (w-BN). H-BN is the most stable and soft form, and that is why it is used as a lubricant and additive in cosmetics. There are other forms of polymorphism that are less common, such as a-BN, t-BN, r-BN, m-BN, and o-BN.
Hexagonal boron nitride Hexagonal boron nitride is synthesized by nitridation or ammonolysis of boron oxide at extremely high temperatures. Hexagonal BN has a microstructure similar to that of graphite. The lamellar microstructure and layered lattice structure make it a good lubricating material. It is resistant to sintering and is mostly formed by hot pressing.
Structurally, h-BN is a white, greasy powder; it is similar to graphite in another way. H-BN crystal structure is hexagonal and the BN molecule is partially ionic, which reduces the electrical conductivity. Both h-BN and c-BN showed high chemical and thermal stability. However, h-BN is more stable than c-BN and does not deteriorate even at temperatures up to 1000°C (in air), 1400°C (in vacuum) and 2850°C (in inert atmosphere). Therefore, h-BN thermal conductivity is close to graphene, which is why it is considered to be one of the most advanced ceramic materials today.
Under hot pressing condition, h-BN can be easily machined using traditional metal cutting technology. Other key features of h-BN include high dielectric breakdown strength, high volume resistivity and excellent chemical inertia.
What is h-BN used for? BN is used as a substrate material for graphene electronic products. It is used to make dielectrics for the next generation of nano electronic devices. It is used as a high quality and low permittivity railing material for two-dimensional rampant vertical electron tunneling devices. Thin h-BN is used for corrosion and oxidation protection coatings. H-BN is effectively used for gas sensing. The material is an essential substance for sensing gases such as ammonia and ethanol.
Cubic boron nitride C-BN is the second hard material known, second only to diamond. The material is made from hexagonal BN under high pressure and high temperature. Although h-BN is similar to granite, c-BN is similar to diamond (another allotrope of carbon) and behaves similarly. The characteristics of cubic boron nitride reflect the characteristics of diamond. In the past few decades, there has been a surge in the application of cubic boron nitride, resulting in an increase in commercial production of C-BN.
In terms of hardness, c-BN is harder than traditional grinding materials such as Al2O3, SiC and boron carbide. This means that the output performance of grinding with c-BN grinding wheel is better than that obtained with traditional abrasive grinding wheel.
What is c-BN used for? For cutting tools, c-BN is used as sintering c-BN. Cubic boron nitride is used as insulating material in electronic products. C-BN is a kind of III-V semiconductor compound. It has a wide band gap, which makes it an excellent insulator. C-BN is also known for its excellent wear resistance and inertia for chemical reactions with other reactive materials. C-BN is now also used to develop protective coatings because of its high hardness and excellent wear resistance. The chemical inertia of boron nitride usually makes it suitable to be used as a protective lining for thermocouple jackets, crucibles and reaction vessels.
Hexagonal boron nitride price The price is influenced by many factors including the supply and demand in the market, industry trends, economic activity, market sentiment, and unexpected events. If you are looking for the latest hexagonal boron nitride BN price, you can send us your inquiry for a quote. ([email protected])
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