Metal Foams: A Design Guide

44 Metal Foams: A Design Guide
Table 4.1 (continued )
(b) Ranges a for thermal properties of commercial b metfoams
Property (units), Cymat Alulight Alporas ERG Inco
symbol
Material Al – SiC Al Al Al Ni
Relative density ( ) 0.02–0.2 0.1–0.35 0.08–0.1 0.05–0.1 0.03–0.04
Structure Closed cell Closed cell Closed cell Open cell Open cell
Melting point (K), 830 – 910 840 – 850 910 – 920 830 – 920 1700 – 1720
Tm
Max. service temp. 500 – 530 400 – 430 400 – 420 380 – 420 550 – 650
(K), Tmax
Min. service temp. 1–2 1–2 1–2 1–2 1–2
(K), Tmin
Specific heat 830 – 870 910 – 920 830 – 870 850 – 950 450 – 460
(J/kg.K), Cp
Thermal cond. 0.3–10 3.0–35 3.5–4.5 6.0–11 0.2–0.3
(W/m.K),
Thermal exp. 19–21 19–23 21–23 22–24 12–14
(10 6 /K), ˛
Latent heat, melting 355 – 385 380 – 390 370 – 380 380 – 395 280 – 310
(kJ/kg), L
(c) Ranges a for electrical resistivity of commercial b metfoams
Property (units), Cymat Alulight Alporas ERG Inco
symbol
Material Al–SiC Al Al Al Ni
Relative density ( ) 0.02–0.2 0.1–0.35 0.08–0.1 0.05–0.1 0.03–0.04
Structure Closed cell Closed cell Closed cell Open cell Open cell
Resistivity (10 8 90–3000 20–200 210–250 180–450 300–500
ohm.m), R
a The data show the range of properties associated with the range of relative density listed in the third row of the table. The
lower values of a property are associated with the lower densities and vica versa, except for densification strain, where the
reverse is true.
b Contact information for suppliers can be found in Chapter 18.
c Data for endurance limit, loss coefficient and fracture toughness must, for the present, be regarded as estimates.