The following link will help you:

http://www.ifam.fraunhofer.de/content/dam/ifam/de/documents/dd/Publikationen/2014/WorldPM_2014_Wei%C3%9Fg%C3%A4rber_ADVANCED_PM_TECHNOLOGIES_TO_MANUFACTURE_THERMOELECTRIC_MATERIALS_AND_SUPERCAPACITORS_MPIF_APMI.pdf

A couple of papers attached if this is relevant to what you are looking for.

Best,

Rad

 Dear Islam and Radhwan 

Thank you for your answers, however still the question is there about the metal foams, I think still there are little works about that.

Hi Sadeem,

to the best of my knowledge so there are some companies in both Japan (Shinko wire company),  Hydro Aluminium in Norway and AZO materials in the states that makes metal foams utilizing aluminium, titanium and tantalum. As you may know that foam materials have very high porosity and low thermal conductivity which in turns makes them unattractive for the applications you are interested in. However, good for industrial purposes i.e. filtering, damping, weight saving and others. I guess you are right in assuming that not much work has been done on this yet.

Never the less, a paper enclosed titled "Composite and Nanocomposite Metal Foams" Published: 28 January 2016 may well help as I noticed some attempted work in the references of this paper that may well be related to your field of interest.

Best,

Rad

Hi Dear Radhwan

thank you so much, it's an interested paper. 

Best regards

Sadeem

Yes

you can read this paper

Effects of heat enhancement for exhaust heat exchanger on the

performance of thermoelectric generator

Chi Lu, Shixue Wang*, Chen Chen, Yanzhe Li

 Dear Dr. Ahmed 

Thanks a lot

Best regards

Sadeem