There are many types of boron nitride, and the uses of all kinds of boron nitride are different

Overviews of Boron nitride
Boron nitride is a crystal composed of nitrogen atoms and boron atoms. The chemical composition is 43.6% boron and 56.4% nitrogen, with four different variants: hexagonal boron nitride (HBN), rhombohedral boron nitride (RBN), cubic boron nitride (CBN), and wurtzite nitrogen Boron (WBN).

 
Properties of Boron Nitride
Boron nitride is usually black, brown, or dark red crystals with a zinc blend structure and good thermal conductivity. Hardness is second only to diamond, it is a super hard material, often used as tool materials and abrasives.
Boron nitride has chemical resistance properties and is not corroded by inorganic acids and water. The boron-nitrogen bond is broken in the hot concentrated alkali. Above 1200℃, it will start to oxidize in the air. The melting point is 3000°C, and it begins to sublimate when it is slightly lower than 3000°C. It begins to decompose at about 2700°C under a vacuum. Slightly soluble in hot acid, insoluble in cold water, relative density 2.25. The compressive strength is 170MPa. The maximum operating temperature is 900°C in an oxidizing atmosphere, while it can reach 2800°C in an inactive reducing atmosphere, but the lubrication performance is poor at room temperature. Most of the properties of boron carbide 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.
 
Different types of boron nitride have different functions
H-BN-A, B, C: The product is medium crystalline, has excellent high temperature and oxidation resistance, its original particle size is small, and the agglomeration particle size is large. Because the particles are spherical, they are especially suitable for fillers, casting molding, and injection molding. Molding agents and composite ceramics are also easy to hot press.
H-BN-D: Product performance reaches or approaches the advanced level of similar foreign products, which can replace imports. The product has a particle size similar to that of PTFE and uniform particle size, so it is particularly suitable for high-pressure switch nozzles; at the same time, due to its better thermal conductivity, it is very suitable for thermally conductive plastics or thermally conductive rubber; and due to its lower oxygen content (generally Less than 0.5%), it is also particularly suitable for special ceramic raw materials.
H-BN-E: The product has high crystallinity and a more uniform particle size. The properties of high crystallinity hexagonal boron nitride such as heat conduction, insulation, lubrication, high-temperature resistance, and molten metal corrosion resistance are better than ordinary products. It can be used in various high-end fields, including cosmetics and thermally conductive materials, with performance reaching or close to the advanced level of similar foreign products, and it can replace imports.
H-BN-F: The product itself has high thermal conductivity, electrical insulation, low dielectric constant, low expansion coefficient, and good stability, so it is often used as an additive in the high-end electronics industry. Currently, other application areas of this product are being developed.
 
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