Surface Refinement of Metal Foams

✍ Scribed by M. Maurer; L. Zhao; E. Lugscheider

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 278 KB
• Volume: 4
• Category: Article
• ISSN: 1438-1656
• DOI: 10.1002/1527-2648(20021014)4:10<791::aid-adem791>3.0.co;2-q

✦ Synopsis

Aluminium foams produced via the PM-process are characterized by a moderate specific strength, a high surface roughness, and a poor wear behavior; to increase their mechanical properties and to improve the surface finish, wear and corrosion resistance; thermally sprayed coatings can be applied. The quality of the coating depends on the coating material, the chosen process, the preparation of the surface and spraying parameters. Aluminium alloys and iron based alloys for abrasive applications were deposited via electric arc spraying, ceramic coatings against wear were deposited by means of plasma spraying. Hard metallic coatings for severe abrasive applications were applied by high-velocity-oxyfuel spraying (HVOF). The results proved the suitability of this technique to significantly enhance the mechanical properties and the surface finish of metal foams. The specific strength and stiffness of the new composite materials outperform pure metal foams. The corrosion behavior was tested performing a salt spray test.