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 available 10, 20, 30, 45, 65, 80, and 100 ppi
Ash content 0.39 wt% at 1000°C
Bulk density 0.045 g/cm3
Ligament density 1.538 g/cm3
Resistivity 0.75 Ω · cm
Specific heat 0.30 cal/g/°C
Maximum use temperature 350°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°C 625 (10% deflection)
763 (ultimate)
Compressive strength, kPa at 1000°C in argon 391 (10% deflection)
628 (ultimate)
Shear strength at 20°C 290 kPa
Tensile strength at 20°C 690 kPa
Flexural strength at 20°C 690 kPa
Flexural modulus 58.6 MPa

Silicon Carbide Foam

Typical Physical Properties of Open-Cell Silicon Carbide

Pore sizes available 10, 20, 30, 45, 65, 80, and 100 ppi
Bulk density 0.16–1.28 g/cm3
Relative density 5–40%
Theoretical ligament density 3.2 g/cm3
Specific heat (10% SiC) 0.34 cal/g/°C
Maximum use temperature 1650°C in air
2500°C inert
Thermal expansion see below
Thermal conductivity see below
Strength see below
Young’s modulus see below
Strain to failure 0.07% at 20°C
Thermal Properties

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

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

Pressure drop data

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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