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六方晶窒化ホウ素および立方晶窒化ホウ素 (Hexagonal Boron Nitride and Cubic Boron Nitride)

2019年06月20日 | Advanced ceramics
In recent years, new materials based on ceramics have developed rapidly. Boron nitride ceramic is a kind of hexagonal crystal system with phosphorus structure and special physicochemical properties. It is a new industrial material developed with the development of the aerospace and electronics industry and has a wide range of applications in industry and production.

At present, research on boron nitride is mainly concentrated on the hexagonal phase (h-BN) and the cubic phase (c-BN). Hexagonal boron nitride has good lubricity, thermal conductivity and high temperature performance. Recent studies have shown that the hexagonal phase is also in thermodynamic equilibrium and steady state at room temperature and pressure. The main application of hexagonal boron nitride is to act as a raw material for the synthesis of cubic boron nitride.



Hexagonal boron nitride is called white graphite because it has a similar layered crystal structure and physical and chemical properties similar to graphite (good lubricity and thermal conductivity). Hexagonal boron nitride is commonly used as a sintered ceramic material. In addition, due to its high thermal conductivity, good electrical insulation properties, low thermal expansion coefficient and non-thermal properties, h-BN structural ceramics have been widely used in high temperature insulation components, atomic energy, metallurgy, aviation and other fields. As a raw material for synthesizing cubic boron nitride, hexagonal boron nitride is a theoretical low-temperature stable phase, and its excellent performance is more attractive. Therefore, hexagonal boron nitride is commonly used to synthesize cubic boron nitride.

Boron nitride ceramics have excellent thermal stability and dielectric properties. They are one of the few compounds that can decompose at high temperatures, and have excellent thermal and electrical stability even over a wide temperature range. However, single-phase boron nitride ceramics have not been put to practical use due to low strength, hardness, elasticity, high thermal conductivity, low corrosion resistance, and difficulty in forming a shape component.
As an advanced ceramic material, boron nitride is widely favored in the field of materials research due to its excellent mechanical properties. The new boron nitride synthesis method has become a hot topic in boron nitride research.

Popular boron nitride products
Boron nitride ceramic sheet: https://www.preciseceramic.com/products/boron-nitride-h-bn-plate-sheet/
Boron nitride crucible (bn crucible): https://www.preciseceramic.com/products/boron-nitride-crucible/
Advanced Ceramic Materials Manufacturer: https://www.preciseceramic.com/

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