Machining / Grinding Pyrolytic Boron Nitride Ceramics

CiDRA® Precision Services, LLC has years of experience manufacturing micron level tolerance products from Pyrolytic Boron Nitride ceramics. We leverage our in-depth dicing, drilling, milling, grinding, and polishing capability to manufacture the highest quality Pyrolytic Boron Nitride products.

Whether you need prototypes or volume production, CiDRA® Precision Services, LLC is here to help. Please contact us to discuss your applications.

About Pyrolytic Boron Nitride Ceramics

Pyrolytic Boron Nitride is fabricated using chemical vapor deposition (CVD) to layer material onto graphite molds.  The Pyrolytic Boron Nitride is subsequently separated from the molds using a number of standard techniques.  This results in an anisotropic ceramic that exhibits high electrical resistance and good thermal conductivity.  Some of its material properties can vary by a factor of 20 depending on orientation.  For example, the highly anisotropic nature of Pyrolytic Boron Nitride’s thermal conductivity means it can conduct heat in one direction while insulating in the other. Pyrolytic Boron Nitride also has one of the highest dielectric strengths.  Although it is a low mechanical strength material, Pyrolytic Boron Nitride has the unusual characteristic of increased mechanical strength at elevated temperatures.

Pyrolytic Boron Nitride Applications

  • Crystal growth boats
  • Crucibles
  • MBE furniture

Pyrolytic Boron Nitride Properties

 

Units

Pyrolytic Boron Nitride (Through Thickness, c Plane)

Pyrolytic Boron Nitride (Deposition Plane, ab Plane)
Max Use Temperature
(No Load)		 C 2200 - 2500 2200 - 2500
Thermal Shock
(Quenching)		 C 2000 2000
Thermal Conductivity W/(m K) 1.7 - 2 60 - 105
Specific Heat  J/(K kg) 837 837
Coefficient of Thermal Expansion 1/C (x10e-6) 30 - 36 2 - 3.1
Color White White
Moh Hardness
Vickers Hardness kg/mm^2
Knoop Hardness kg/mm^2
Density g/cm^3 1.95 - 2.22 1.95 - 2.22
Porosity % of nominal 0 0
Compressive Strength Mpa 331 100 - 255
Tensile Strength Mpa 40 -145
Flexural Strength MPa 83 - 193
Fracture Toughness MPa m^1/2
Young's Modulus GPa 22 - 23.4
Poisson's ratio 0.25 0.1 - 0.25
Dielectric Strength kv/cm 2000 2000
Dielectric Constant (@1MHz) 3.4 5.2
Dielectric Loss Tangent 5 x 10 ^ - 5 2 x 10 ^ - 4
Resistivity ohm cm >10^15 >10^15
The information provided in this table is for room temperature only, and is a compilation of publicly available data.  This information is provided for comparison purposes only, and is not intended to be warrantable.   Further, CiDRA® Precision Services, LLC disclaims any and all liability from errors, inaccuracies, or omissions.

 

Please contact us if you would like to discuss your Pyrolytic Boron Nitride dicing, drilling, milling, grinding, polishing or any other machining applications.