Properties:
1. High heat resistance: sublimation at 3000℃, its strength at 1800℃ is twice that of room temperature, and it will not break when air cooled to room temperature from 1500℃ for dozens of times. It does not soften in gas at 2800℃.
2. High thermal conductivity: hot pressed products are 33W/M.K. Like pure iron, they are the materials with the largest thermal conductivity among ceramic materials above 530°C.
3. Low thermal expansion coefficient: The expansion coefficient of 2×10-6 is second only to quartz glass and is the smallest among ceramics. In addition, it has high thermal conductivity, so its thermal shock resistance is very good.
4. Excellent electrical properties: good high-temperature insulation, 1014Ω-cm at 25°C, and 103Ω-cm at 2000°C. It is the best high-temperature insulating material among ceramics, with a breakdown voltage of 3KV/ MV, low dielectric loss is 2.5×10-4 at 108HZ, dielectric constant is 4, and can transmit microwaves and infrared rays.
Uses of hexagonal boron nitride
1. Boron nitride is a release agent for metal molding and a lubricant for metal drawing.
2. Boron nitride is a special electrolytic and resistance material under high temperature conditions.
3. Boron nitride is suitable for high-temperature solid lubricants, extrusion anti-wear additives, additives for generating ceramic composite materials, refractory materials and antioxidant additives, especially for molten metal Faust resistance, thermal enhancement Additives, high temperature resistant insulation materials.
4. Boron nitride is suitable for heat sealing desiccant of transistors and additives for polymers such as plastic resins.