Boron nitride consists of an equal number of nitrogen (N) and boron (B) atoms, with a chemical composition of 43.6% boron and 56.4% nitrogen. It primarily exists in four forms: hexagonal boron nitride (h-BN), cubic boron nitride (c-BN), rhombohedral boron nitride (r-BN), and wurtzite boron nitride (w-BN). Among them, hexagonal boron nitride (h-BN) has a layered crystal structure similar to graphite, where boron and nitrogen atoms are bonded by covalent bonds within the layers, and the layers are held together by van der Waals forces. Boron nitride has widespread applications across various fields. For example, in electronic engineering, it is used in high-temperature electronic packaging, power electronics cooling, microwave dielectric ceramics, lightweight composites, insulation materials for electronic devices, and high-energy radiation detectors. Hexagonal boron nitride, with its excellent lubricity, electrical conductivity, and high-temperature stability, is widely used in lubricants, insulation materials, and refractory materials. Cubic boron nitride, with its high hardness and excellent thermal conductivity, is commonly used in the manufacture of high-hardness tools and abrasives.