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Polycrystalline CVD Diamond

CVD diamond is a non-oxide engineering ceramic. It has the highest tensile strength among non-oxide engineering ceramics. In addition, it has the highest thermal conductivity and a very low heat capacity. The graph bars on the material properties cards below compare CVD diamond to other non-oxide engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

1050 GPa 150 x 106 psi

Fracture Toughness

5.5 MPa-m1/2 5.0 x 103 psi-in1/2

Poisson's Ratio

0.1

Tensile Strength: Ultimate (UTS)

750 MPa 110 x 103 psi

Thermal Properties

Specific Heat Capacity

500 J/kg-K 0.12 BTU/lb-°F

Thermal Conductivity

1900 W/m-K 1100 BTU/h-ft-°F

Thermal Expansion

1.0 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz

5.7

Electrical Dissipation At 1 MHz

0.00020

Electrical Resistivity Order of Magnitude

13 10x Ω-m

Otherwise Unclassified Properties

Density

3.5 g/cm3 220 lb/ft3

Light Transmission Range

0.22 to 100 µm

Refractive Index

2.4

Common Calculations

Stiffness to Weight: Axial

170 points

Stiffness to Weight: Bending

96 points

Strength to Weight: Axial

59 points

Strength to Weight: Bending

52 points

Thermal Diffusivity

1080 m2/s

Thermal Shock Resistance

51 points

Followup Questions

Further Reading

Ceramics and Composites: Processing Methods, Narottam P. Bansal and Aldo R. Boccaccini (editors), 2012

Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005