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Insaco Incorporated

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Machinable Ceramic Materials - CVD Silicon Carbide® (SiC)

CVD Silicon Carbide® (SiC)

Silicon Carbide is among the hardest of ceramics, and retains hardness and strength at elevated temperatures, which translates into among the best wear resistance also. Additionally, SiC has a high thermal conductivity, especially in the CVD (chemical vapor deposition) grade, which aids in thermal shock resistance. It is also half the weight of steel.

Based on this combination of hardness, resistance to wear, heat and corrosion, SiC is often specified for seal faces and high performance pump parts.

Reaction Bonded SiC has the lowest cost production technique with a course grain. It provides somewhat lower hardness and use temperature, but higher thermal conductivity.

Direct Sintered SiC is better grade than Reaction Bonded and is commonly specified for high temperature work.

CVD SiC ® is a face centered cubic, polycrystalline form produced by chemical vapor deposition. This material is extremely pure, and is specified for its excellent thermal conductivity approaching 300 W/mK. It is considerably more expensive to produce than the sintered or reaction bonded grades.
® Rohm & Haas.

 Density gm/cc 3.21
 Hardness Knoop kg/mm2 2540
 Tensile Strength kpsi -
 Modulus of Elasticity psi x 106 68
 Flexural Strength kpsi 67
 Compressive  Strength kpsi -
 Poisson's Ratio - 0.21
 Fracture Toughness MPa m1/2 2.7-3.3
 Dielectric Strength ac volts/mil -
 Dielectric Constant (at 1 MHz) -
 Volume Resistivity ohm-cm2/cm -
 Coefficient of
 Thermal Expansion
x10-6/°C 2.2
 Thermal Conductivity W/m°K 300
 Specific Heat cal/g°C 0.7
 Max Working Temp °C -
 Shock Resistance °C diff. -
All properties are at room temperature unless otherwise noted.

Engineering data are representative, and are not intended as absolute nor warrantable. Manufacturer’s Data shown is blended from multiple sources and therefore illustrates the marketplace.

This technical information has been contributed by
Insaco Incorporated

Click here to find suppliers

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