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PBN Machined Products, Pyrolytic Boron Nitride

PBN Machined Products, Pyrolytic Boron Nitride

Pyrolytic Boron Nitride (PBN) is a type of high-purity ceramic material with excellent thermal and electrical properties. PBN is made through a chemical vapor deposition (CVD) process where boron and nitrogen gases are heated to high temperatures and deposited onto a substrate, creating a thin layer of PBN. This layer can then be removed and machined into various shapes and sizes.

PBN is commonly used in high-temperature applications where traditional ceramics would not be able to withstand the extreme heat. Its high thermal conductivity and low thermal expansion make it an excellent material for use in vacuum furnace insulation, semiconductor manufacturing, and other high-temperature processes.

PBN can be machined into various shapes, including crucibles, sheets, tubes, and custom parts. Its properties make it an ideal material for creating heaters, coatings, and other high-temperature components. PBN heaters can be designed to heat up to 2000°C and provide uniform heating, making them useful in semiconductor manufacturing and other high-temperature processes.

PBN is also used as a coating for graphite components, protecting them from oxidation and wear in high-temperature applications. The PBN coating provides a non-reactive surface, reducing contamination and prolonging the lifespan of the graphite component.

Comparison of Boron Nitride Ceramics

Compositions BN>98% BN+SiC+ZrO2 BN+AIN
Binder B2O3 / AlBO3
Density 2.1-2.2 g/cm3 2.3-3.0 g/cm3 2.5-2.6 g/cm3
25°C Volume Resistivity >1013 Ω·cm >1012 Ω·cm >1014 Ω·cm
Max. Service Temp. (°C)
Inert Gas;
High Vacuum










Flexural Strength 75 Mpa 100 Mpa 130 Mpa
Compressive Strength 100 Mpa 300 Mpa 250 Mpa
Coefficient of Thermal Expansion
2.0 x 10–6/K 4.0 x 10–6/K 4.5 x 10–6/K
Thermal Conductivity 30 W/mK 40 W/mK 60 W/mK



PBN Machined Product Properties

Compound Formula BN
Molecular Weight 24.82
Appearance White
Melting Point 2973 °C
Density 2.1 g/cm3 (h-BN); 3.45 g/cm3 (c-BN)
Solubility in H2O Insoluble
Refractive Index 1.8 (h-BN); 2.1 (c-BN)
Electrical Resistivity 13 to 15 10x Ω-m

PBN Machined Product Applications

Boron Nitride ceramic from CG Material can withstand high temperature in high vacuum environment, plus it has excellent corrosion resistance and electrical resistance. Thus, Boron Nitride ceramic product is an ideal choice in a wide range of industries, such as:
– Crucibles for crystal growth
– Break rings for horizontal casting machine
– Insulators for high temperature furnace
– Electric insulators in vacuum system
– Feed through for high voltage equipment


We handle our products with care to ensure they remain in their original condition during storage and transportation and to preserve their quality.


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