Machining / Grinding Pyrolytic Graphite Ceramics

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

Pyrolytic Graphite can be fabricated by a few processes, but the purest material comes from chemical vapor deposition (CVD) over molds, just as is done with Pyrolytic Boron Nitride. Pyrolytic Graphite has anisotropic material properties and has the highest in-plane thermal conductivity of any ceramic (approaching copper) while maintaining low thermal conductivity through the thickness. It is also an electrically conductive material. Although Pyrolytic Graphite is a low mechanical strength material, its strength is higher than native Graphite, and can be used at extremely high temperatures.

Pyrolytic Graphite Applications

  • Piston heads
  • Rocket nozzles
  • Thermal management devices and coatings

Pyrolytic Graphite Properties

 

Units

Pyrolytic Graphite
(Through Thickness,
c Plane)

Pyrolytic Graphite
(Deposition Plane, ab Plane)
Max Use Temperature
(No Load)		 C 1900 - 2200 1900 - 2200
Thermal Shock
(Quenching)		 C
Thermal Conductivity W/(m K) 2.2 - 3.5 400 - 444
Specific Heat  J/(K kg) 1880 1880
Coefficient of Thermal Expansion 1/C (x10e-6) 6.5 - 7.9 0.5 - 0.6
Color
Moh Hardness
Vickers Hardness kg/mm^2
Knoop Hardness kg/mm^2
Density g/cm^3 2.18 - 2.22 2.18 - 2.22
Porosity % of nominal
Compressive Strength Mpa 247 100 - 103
Tensile Strength Mpa 80 - 89
Flexural Strength MPa 83 - 120
Fracture Toughness MPa m^1/2
Young's Modulus GPa 20 - 41
Poisson's ratio 0.9 -0.15
Dielectric Strength kv/cm
Dielectric Constant (@1MHz)
Dielectric Loss Tangent
Resistivity ohm cm 0.5 - 0.6 5x10^-4
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 Graphite dicing, drilling, milling, grinding, polishing or any other machining applications.