High-Performance Boron Nitride Ceramics - Sintered Plates & Crucibles from China Suppliers and Factory

Boron nitride ceramics, often hailed as 'white graphene,' are a premium class of advanced ceramic materials with various crystal structures, including hexagonal, cubic, and wurtzite forms. Manufactured by leading suppliers in China, these ceramics boast remarkable thermal conductivity, outstanding electrical insulation, and excellent resistance to high temperatures and chemicals. Their unique combination of properties makes them essential for high-end industries such as electronics, metallurgy, and aerospace. As a reputable factory, we ensure that our boron nitride ceramics meet stringent quality standards, making them irreplaceable in advanced applications where performance is crucial

Product Detail

High Temperature Stability

h-BN can withstand temperatures of up to 2000°C in an inert atmosphere and remains stable in an oxidizing environment up to 900°C.

c-BN does not convert to h-BN below 1400°C.

Thermal Property

h-BN has better thermal conductivity than aluminum oxide (parallel to c-axis: 400 W/m·K, perpendicular to c-axis: 30 W/m·K).

It exhibits a low coefficient of thermal expansion (h-BN: parallel to c-axis -2.7×10⁻⁶/°C, perpendicular to c-axis 38×10⁻⁶/°C).

Mechanical Property

h-BN has a low hardness (Mohs hardness ~2) and excellent machinability; c-BN has a hardness second only to diamonds.

h-BN exhibits excellent thermal shock resistance due to its low elastic modulus.

Electrical Property

h-BN is a high-quality insulator (resistivity > 10¹⁴ Ω·cm, dielectric constant ~ 4).

c-BN is a wide-bandgap semiconductor (bandgap width ~ 6.4 eV).

Chemical Inertness

Resistant to corrosion by molten metals (such as aluminum and copper), and does not react with acids/bases (except for concentrated sulfuric acid and molten alkali).

Frequently Asked Questions

Q: What is the maximum temperature hexagonal Boron Nitride (h-BN) can withstand?

h-BN can withstand temperatures of up to 2000°C in an inert atmosphere, and it remains stable in an oxidizing environment up to 900°C.

Q: At what temperature does cubic Boron Nitride (c-BN) convert to h-BN?

c-BN is highly stable and does not convert to h-BN at temperatures below 1400°C.

Q: How does the thermal conductivity of h-BN compare to aluminum oxide?

h-BN has superior thermal conductivity compared to aluminum oxide, measuring 400 W/m·K parallel to the c-axis and 30 W/m·K perpendicular to the c-axis.

Q: What are the mechanical differences between h-BN and c-BN?

h-BN has a low hardness (Mohs hardness ~2) and is easy to machine with excellent thermal shock resistance. In contrast, c-BN is extremely hard, second only to diamonds.

Q: Is h-BN an electrical conductor or an insulator?

h-BN is a high-quality electrical insulator with a resistivity greater than 10¹⁴ Ω·cm and a dielectric constant of approximately 4.

Q: Does Boron Nitride react with molten metals or acids?

h-BN exhibits excellent chemical inertness. It resists corrosion by molten metals like aluminum and copper, and does not react with acids or bases, except for concentrated sulfuric acid and molten alkali.