Properties of Foam Materials

Properties of Foam Materials

Abundant data on various foam materials offered by Ultramet are available on request. Selected information follows.

Reticulated Vitreous Carbon Foam

Typical Physical Properties of Open-Cell Reticulated Vitreous Carbon

Pore sizes available10, 20, 30, 45, 65, 80, and 100 ppi
Ash content0.39 wt% at 1000°C
Bulk density0.045 g/cm3
Ligament density1.538 g/cm3
Resistivity0.75 Ω · cm
Specific heat0.30 cal/g/°C
Maximum use temperature350°C in air
3500°C inert
Thermal expansion, ppm/°C
0–200°C
0–500°C
0–1000°C
1.15
1.65
1.65
Thermal conductivity, W/m · K
at 200°C
at 300°C
at 400°C
at 500°C
at 650°C
at 800°C
at 950°C
0.085
0.125
0.180
0.252
0.407
0.625
0.882
Compressive strength, kPa at 20°C625 (10% deflection)
763 (ultimate)
Compressive strength, kPa at 1000°C in argon391 (10% deflection)
628 (ultimate)
Shear strength at 20°C290 kPa
Tensile strength at 20°C690 kPa
Flexural strength at 20°C690 kPa
Flexural modulus58.6 MPa

Silicon Carbide Foam

Typical Physical Properties of Open-Cell Silicon Carbide

Pore sizes available10, 20, 30, 45, 65, 80, and 100 ppi
Bulk density0.16–1.28 g/cm3
Relative density5–40%
Theoretical ligament density3.2 g/cm3
Specific heat (10% SiC)0.34 cal/g/°C
Maximum use temperature1650°C in air
2500°C inert
Thermal expansionsee below
Thermal conductivitysee below
Strengthsee below
Young’s modulussee below
Strain to failure0.07% at 20°C

Thermal properties of silicon carbide foam produced to 10 vol% dense (0.32 g/cm3). Thermal expansion is independent of vol% density and matches that of solid silicon carbide.

Strength and Young’s modulus as a function of bulk density for open-cell silicon carbide foam

Pressure drop data for water flow through 2 × 3 × ½” slabs of silicon carbide foam with water flowing parallel to the long axis of the sample; 80- and 100-ppi foams with relative densities of 20 and 30% were tested.

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