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  CVD DIAMOND COMPARISON

  compare CVD diamond with other hard materials

DDK makes CVD Diamond products cost-effective for applications from the most common to the most sophisticated. CVD Diamond has replaced less effective materials in existing industries and become the chosen material for challenging next generation applications.

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CVD Diamond Property Comparison
Natural CVD PCD Tungsten Carbide Sapphire SiN Si GaAs Cu cBN Ag
Thermal Conductivity W/m-K 900-3200 1000-2000 400-650 70 25 25 150 44 400 1300 410
cal/mol-C 2.15 0.06 0.91 0.99
Electrical Resistivity ohm-cm >1016 1.7 x 10-6
Strength, Fracture
MPa		 2800 1000 550-1150 2000 430 830 130
Hardness
GPa		 80 70 49.8 17.9
Heat Capacity,
300K J/kg-K		 515.74
Coeff. Thermal Exp. x
106K-1 at 300K		 1.2 1.2 4.2 3.3 8 4.1 6.5 17 19
Refractive Index 2.42 2.38 1.77 3.4 3.75 2.12
Lattice Constant
cm		 3.57 x 10-8
Sound Velocity
105cm/sec		 18.21 15.85 6.7
Band Gap
eV		 7.0 2.5 0.81
Dielectric Constant 5.7 5.7 11.7 10.9 7.1
Loss Tangent < 4 x 10-4
Dielectric Strength
105 V/cm		 100 100 3 4