The 2018 Tokyo High Performance Ceramics Exhibition ended successfully




Boron nitride can be used to manufacture crucibles for semiconductor melting, high-temperature containers for metallurgical applications, heat-dissipating and insulating components for semiconductors, high-temperature bearings, thermocouple sheaths, and glass-forming molds. Boron nitride is typically produced in a graphitic structure, commonly known as white graphite. Another form is the diamond-like structure, which is similar in principle to the transformation of graphite into diamond; graphitic boron nitride can be converted into diamond-like boron nitride under high temperature (1800°C) and high pressure (800 MPa). In this form of boron nitride, the B-N bond length (156 pm) is similar to the C-C bond length (154 pm) in diamond, and its density is also comparable to that of diamond. Its hardness rivals that of diamond, while its heat resistance exceeds that of diamond, making it a new type of high-temperature-resistant superhard material used in the manufacture of drill bits, grinding tools, and cutting tools.
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