In the high-temperature industrial sector, where higher efficiency and longer service life are sought after, the selection of furnace lining materials is of critical importance. Hexagonal boron nitride (h-BN) is emerging as an ideal material for revolutionizing high-temperature furnace linings, thanks to its exceptional physical and chemical properties, which significantly enhance furnace performance.

The core advantages of h-BN lie in its extreme high-temperature resistance and thermal shock resistance:

Ultra-high melting point: Approaching 3000°C, far exceeding most metals and ceramics.

Exceptional thermal shock resistance: It can withstand repeated rapid cooling and heating shocks between 1500°C and room temperature, with thermal shock resistance exceeding that of alumina ceramics by more than five times. This is attributed to its extremely low thermal expansion coefficient, effectively preventing thermal stress cracking. It maintains structural stability in extreme environments such as vacuum furnaces and hot-press sintering furnaces, significantly extending the lifespan of furnace linings.

The chemical inertness and multifunctionality of h-BN are equally critical:  

Chemical “fortress”: It reacts minimally with acids, alkalis, and molten metals. In metallurgical melting furnaces, it effectively resists corrosion from molten metals, prevents damage to the furnace body caused by penetration, and ensures the integrity of the furnace lining.  

Self-lubricating friction reduction: Reduces friction between materials and the furnace lining, minimizing wear.

Reliable Electrical Insulation: Ensures safe use in high-temperature, high-voltage environments and eliminates the risk of short circuits.

Significant Benefits Verified in Practical Applications:

After adopting h-BN-containing mold furnace linings, a certain automotive parts factory saw the service life of its molds increase from 50,000 cycles to 70,000 cycles, significantly improving production efficiency.

Some high-temperature furnaces have achieved effective energy savings after adopting h-BN furnace linings. This is attributed to its excellent thermal conductivity, which enables more efficient heat transfer and improves energy utilization.

Bright future prospects: As preparation processes continue to be optimized, h-BN's performance will continue to improve, and costs are expected to decrease. This will undoubtedly drive its widespread adoption in more high-temperature industrial applications (such as semiconductor and aerospace heat treatment), providing strong support for the development of more efficient, stable, and long-lasting high-temperature equipment.