Thermal Properties of PerformancePBN Pyrolytic Boron Nitride PBN

Thermal Properties Of Performance PBN

Summary of Thermal Properties

PROPERTY	VALUE
Thermal Conductivity "a" Direction @25°C	0.25 cal/cm•sec•°C
Thermal Conductivity "a" Direction @500°C	0.17 cal/cm•sec•°C
Thermal Conductivity "a" Direction @1000°C	0.15 cal/cm•sec•°C
Thermal Conductivity "c" Direction @25°C	0.004 cal/cm•sec•°C
Thermal Conductivity "c" Direction @500°C	0.005 cal/cm•sec•°C
Thermal Conductivity "c" Direction @1000°C	0.006 cal/cm•sec•°C
Thermal Expansion "a" Direction @500°C	0.001 mm/mm
Thermal Expansion "a" Direction @1000°C	0.0025 mm/mm
Thermal Expansion "c" Direction @500°C	0.013 mm/mm
Thermal Expansion "c" Direction @1000°C	0.027 mm/mm
Coefficient of Thermal Expansion "a" Direction above @500°C	3 x 10^-6 mm/mm•°C
Coefficient of Thermal Expansion "c" Direction @500°C	30 x 10^-6 mm/mm•°C
Resistance to Thermal Shock: 1200°C into Liquid Nitrogen	no damage
Specific Heat @25°C	0.2 cal/gm•°C
Specific Heat @500°C	0.4 cal/gm•°C
Specific Heat @1000°C	0.47 cal/gm•°C

Performance PBN shows no melting point. It can withstand 1800° C in vacuum and 2000° C in nitrogen. This makes it an excellent choice for furnace components and melting vessels. Performance PBN is resistant to thermal shock. Crucibles heated to 1200° C can be plunged into liquid nitrogen without visible damage.

Performance PBN's thermal conductivity in the "a" direction is similar to that of cast iron, surpassing that of beryllia. For this reason, the compound can conduct heat while acting as an electrical insulator. Thermal conductivity in the "a" direction is almost 66 times greater than thermal conductivity in the "c" direction. Conductivity in the "c" direction increases slightly with increasing temperatures.

Thermal Expansion vs. Temperature

Thermal Condusctivity vs. Temperature "a" Direction

Thermal Conductivity vs. Temperature "c" Direction

Properties of Performance PBN

Physical

Thermal

Chemical / Electrical

A Division of Morgan Advanced Ceramics
Morgan Technical Ceramics is a Global Business Unit of the Morgan Crucible Company plc.
It comprises Morgan Advanced Ceramics and Morgan Electro Ceramics.