What is hexagonal boron nitride?
White graphite refers to another name for hexagonal boron nitride. White graphite is the simplest boron nitrogen polymer. Similar to the hexagonal carbon mesh in graphite, nitrogen and boron in hexagonal boron nitride also form hexagonal mesh layers, which overlap each other to form crystals. The crystal is similar to graphite, with diamagnetism and high anisotropy, and the crystal parameters are also quite similar. Boron nitride is mainly used in refractory materials, semiconductor solid-phase doping sources, structural materials for atomic stacks, packaging materials for anti-neutron radiation, rocket engine constituent materials, high-temperature lubricants and mold release agents. Hexagonal boron nitride is a white crystal with a melting point of nearly 3000°C, high temperature resistance, extremely stable chemical properties, strong acid corrosion resistance, and high electrical insulation properties.
Why is hBN more compatible with thermoplastics?
In the past, in order to improve certain properties of plastics or reduce the cost of plastic preparation, low-cost minerals or glass fillers such as barite, calcium carbonate and kaolin were often added. However, these fillers are not suitable for higher-level thermal conductivity plastic products due to their poor ability. In addition, metal, carbon and graphite fillers are not suitable for applications requiring electrical insulation performance. Combining various requirements, ceramic fillers It has become a standard choice. The common thermally conductive insulating ceramic fillers include hBN (hexagonal boron nitride), AIN, Si3N4, SiC, Al2O3, and ZnO, etc. The hBN has the lowest density and low friction coefficient. In addition to the excellent insulation and thermal conductivity of thermally conductive fillers, the impact of its addition on the processing of thermoplastics is also an important component that we cannot ignore.
The addition of hBN can make the plastic have a low thermal expansion coefficient, make the size of the plastic component more stable, and help meet the needs of applications with strict size requirements. At the same time, for composite materials, the compatibility between different components is also an important assessment condition. After proper surface treatment, hBN can be compatible with a variety of resin systems to obtain better performance and more stable performance. plastic products.
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