As one of the best heat conduction materials in ceramic materials, HBN has a structure similar to that of graphite. It has a hexagonal layer structure and is loose, lubricated, light and soft, with high processability and color. White is therefore also known as “white graphite.”
It is not only a good conductor of heat, but also a typical electrical insulator. It is an ideal high-frequency insulation, high-voltage insulation, high-temperature insulation material.
Boron nitride ceramics, composite ceramics, conductive ceramics, superhard materials, mold release lubricants, high temperature coatings, thermal conductive fillers.
1. High temperature lubricant
h-BN has excellent high-temperature lubricity. When used as a lubricant, it can be dispersed in heat-resistant grease, water or solvent. Sprayed on the friction surface, the solvent evaporates to form a dry mold, because h-BN and steel Stainless steel, aluminum, etc. are neither wet nor active, so it is often used in places resistant to molten metal corrosion, such as crucibles, boats, liquid financial pipes, etc.
2. Thermally conductive filler
BN has been widely used as a filler in thermally conductive composites to solve the problem of short-circuiting of high-resistivity materials required for thermal conductive materials to come into contact with electrical components in operation. The ultrasonically exfoliated two-dimensional boron nitride nanosheets and one-dimensional cellulose nanofibers were blended to prepare a composite with a thermal conductivity of up to 180 W/(m·K), which is the highest thermal conductivity
3. Boron nitride has a significant chemical inertness at high temperatures, allowing boron nitride(BN) coatings to protect materials such as aluminum, magnesium, zinc alloys from high temperature oxidation.
When the boron nitride coating is on a refractory material or a ceramic vessel, it can effectively protect its oxidation resistance even at a temperature of up to 1273K.
4. The ultra-high temperature mold release agent using solid lubricant boron nitride as raw material can maintain excellent lubricity and mold release property under extreme high temperature, so it is suitable for molding diamond tools, molding of high temperature hardening resin, and sintering of metal. Forming, pressing of aluminum frame, molding of glass, demoulding of die casting, etc..
5. High insulation and high thermal conductivity ceramic products
Boron nitride ceramics have good heat resistance, thermal stability, thermal conductivity, high temperature dielectric strength, and are ideal heat dissipation materials and high temperature insulation materials. Because of its good chemical stability, it is resistant to most of the molten metal. The hardness of the product is low (Mohs strength 2), so it can be machined with an accuracy of 1/100mm. It is commonly used in the manufacture of high-temperature containers for metallurgical melting, semiconductor heat-dissipating insulation parts, high-temperature bearings, thermowells, and glass forming dies.
6. Synthetic cubic boron nitride
C-BN is another common form of boron nitride, which is second only to diamonds in hardness and is also a theoretical low temperature stable phase. The use of h-BN in the participation of the catalyst, at high temperature (1800℃), high pressure (800 MPa) into a hard, such as diamond c-BN boron nitride, is currently one of the main methods of synthesizing boron nitride.
Related reading :Hexagonal Boron Nitride Nanoparticle Hexagonal Boron Nitride