Excellent Characteristics Of Hot-Pressed Boron Nitride Ceramic
Hexagonal boron nitride ceramic and its composite materials prepared by hot pressing sintering are an ideal high-temperature thermal conductive insulation material. They have excellent high temperature resistance, metal melt, and slag erosion resistance. They offer high thermal conductivity and high electrical insulation. Additionally, they provide easy processing performance and high processing accuracy (up to 0.01mm), low density, lubrication, and non-toxicity.
Main propertiesof boron nitride ceramic:
- High heat resistance: oxidation begins to occur until 900 °C in an oxidizing atmosphere. It can be safely used up to 2000 °C under vacuum, and does not soften at 2800 °C in an inert gas. Its strength at 1800 °C is twice that of room temperature.
- High thermal conductivity: hot pressing products are 33W/m·k and pure iron. Above 530 °C, it is the material with the largest thermal conductivity among ceramic materials.
- Low thermal expansion coefficient: The expansion coefficient of 2×10-6 is second only to quartz glass. This is the smallest in ceramics.
- Excellent electrical properties: good high temperature insulation, 25 °C is 1014Ω-cm. At 2000 °C it can also reach 103Ω-cm. It is the best high temperature insulation material in ceramics. Breakdown voltage is 3KV/mm. Low dielectric loss is 2~5×10-4 at 108Hz, dielectric constant of 4, microwave, and infrared transmission.
- Good corrosion resistance: it does not react with general metals (iron, copper, aluminum, lead, etc.), rare earth metals, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, and molten salts (crystal stone, fluoride, slag). It withstands inorganic acids and alkalis.
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