Metal foam | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-06

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Metal_foam


00:00:59 1 Open-cell
00:02:37 1.1 Manufacturing
00:03:09 2 Closed-cell
00:04:55 2.1 Manufacturing
00:07:04 3 Composites
00:09:03 4 Stochastic and regular foams
00:09:14 4.1 Stochastic
00:09:51 4.2 Regular
00:10:44 5 Regular foams gallery
00:10:54 6 Applications
00:11:03 6.1 Design
00:11:17 6.1.1 Design gallery
00:11:25 6.2 Mechanical
00:11:34 6.2.1 Orthopedics
00:12:34 6.2.2 Automotive
00:14:35 6.2.3 Energy absorption
00:15:25 6.3 Thermal
00:17:25 7 See also



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SUMMARY
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A metal foam is a cellular structure consisting of a solid metal (frequently aluminium) with gas-filled pores comprising a large portion of the volume. The pores can be sealed (closed-cell foam) or interconnected (open-cell foam). The defining characteristic of metal foams is a high porosity: typically only 5–25% of the volume is the base metal, making these ultralight materials. The strength of the material is due to the square-cube law.
Metallic foams typically retain some physical properties of their base material. Foam made from non-flammable metal remains non-flammable and can generally be recycled as the base material. Its coefficient of thermal expansion is similar while thermal conductivity is likely reduced.