Pyrolytic boron nitride discs and other pyrolytic boron nitride products are synthesized on molds through a chemical vapor deposition (CVD) process using BCl3 and NH3 at high temperatures and low pressures. PBN products have extremely high purity, and the purity of gas raw materials is easier to control. Typically, PBN products have total impurities <100 ppm, which means the purity is no less than 99.99%.

Due to its high density and purity, PBN is becoming a widely used material in vacuum processes. The CVD process gives this pyrolytic boron nitride a near-perfect layered structure, resulting in anisotropic thermal conductivity, making it an ideal material for manufacturing furnace and vacuum system components.

Due to the CVD process, the thickness of PBN products is usually <5mm. The pyrolytic boron nitride wafers available from Edgetech are cut into 1mm, 2mm, or 3mm thick PBN wafers with a diameter of approximately 10~14 inches. The size of the raw PBN blank is limited by the equipment, but highly customized finished shapes can be obtained from it at a competitive cost.

Pyrolytic Boron Nitride Specification

Item

Units

Values

Purity

%

99.99-99.999

Density

g/cm3

1.95-2.20

Tensile Strength

MPa

112

Bending Strength

MPa

173

Compression Strength

MPa

154

Young’s Modulus

GPa

18

Thermal Conductivity

W/m°C

“a” 60,  “c” 2

specific heat capacity

J/g·℃

0.90（RT）

Resistivity

Ω.cm

2×1015

Dielectric Constant

 

“c” 3.07

Metal Impurity Content

ppm

<10

PBN Disc Applications

Pyrolytic Boron Nitride Disc from Edgetech Industries Ceramics Division can withstand high temperatures in a high vacuum environment, it has excellent corrosion resistance and electrical resistance. Based on the above excellent properties, Boron Nitride Disc is an ideal choice in a wide range of industries, such as:

-PBN-coated carrier plate

-Insulation panels for high temperature and high vacuum equipment

-Fixtures for active brazing and reaction sintering in reducing atmosphere

-Helix support rods for traveling wave tube application

-Insulation boards, gaskets, supports, etc. for vacuum, high-temperature, MBE equipment, etc.

Packing

As a ceramic material, boron nitride is quite fragile in a lot of cases. Our Pyrolytic Boron Nitride Disc is carefully handled to minimize damage during storage and transportation. Suitable outer boxes and inner cushioning materials are used for PBN products, vacuum packing is also engaged for some of the parts.