Metallic foams are considered emerging smart materials because of their low density, high heat dissipation, and high energy absorbing capacity. There are various techniques used for the fabrication of metallic foams. Powder metallurgy and casting are the most commonly used techniques. Which is the best technique for the fabrication of metallic foams, casting or powder metallurgy?
the mechanical characteristics of parts that are produced by powder metallurgy are more than that produced by the casting process.
Dear Naveen,
I do not answer to your question but perhaps you will be interested by the following papers (available on research gate) talking about specific metallic powders from which metallic foams can be obtained simply by cold pressing:
- Elaboration of metallic compacts with high porosity for mechanical supports of SOFC. Solid State Sciences, vol.11 (2). pp. 440-450, https://oatao.univ-toulouse.fr/3788/1/Panteix_3788.pdf
- Cold compaction of iron powders - Relations between powder morphology and mechanical properties: Part I: Powder preparation and compaction, Powder Technology 126(1):65-74, DOI:10.1016/S0032-5910(02)00034-7
- - New method to prepare iron particles with different morphologies: a way to get high green strength metal compacts, Powder Metallurgy, 45, 2002 - Issue 1, 33-38,
Article New method to prepare iron particles with different morpholo...
With best regards.
Philippe.
Well , its depend on your final application but powder technology is easy and cheap besides good mechanical properties
Metallic foams have attracted a lot of attention for industrial and scientific purposes. The techniques used for the fabrication of metallic foams should introduce large pores with a very homogeneous distribution and reliable properties but at a low cost. Both, Powder metallurgy and casting routes have their advantages and limitations. The route must be chosen based on the cost of fabrication, material properties, and desired applications.
However, Powder metallurgy has some better advantages over the casting process as it gives more control over pore size distribution which leads to the predictable properties of the foams.
Ved Prakash Dubey
Thank you. I agree with you. In powder metallurgy, porosity can be better controlled in comparison to casting. Also, uniform distribution of pores can be achieved in powder metallurgy.
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