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Lecture

Heat Exchange Structures Based on Copper/CNT Composite

Thursday (27.09.2018)
12:00 - 12:15 S1/03 - 123
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In this study different types of multi-walled carbon nanotubes (MWCNT) and carbon nanofibers (CNF) were produced by the fixed bed method. Nanocomposite materials were prepared by incorporation of CNFs and MWCNTs in copper matrix using powder metallurgy methods. By using hot pressing in combination with hot extrusion, the orientation of the carbon reinforcement was tuned from 3D to 1D alignment. After a selective etching process the carbon reinforcement is partially free-standing at the composite surface, but still embedded in the metal matrix.

The engineered surface acts like a black body. The spectral evaluation of the surface functionalization will be shown for wavelengths from 200 nm to 20 µm. These results are compared to the non-etched composite material as well as to bulk copper.

The free-standing MWCNT also behave like fins/pins in heat exchanger structures. The theoretical heat transfer coefficient of the engineered surface is calculated depending on diameter and length of the free-standing MWCNTs. The results are compared to bulk copper.

The targeted application based on the altered surface properties will be identified and discussed.

 

Speaker:
Dr.-Ing. André Schlott
Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM
Additional Authors:
  • Thomas Hutsch
    Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM
  • Dr. Silke Hampel
    Leibnitz Institute for Solid State and Materials Research
  • Dr. Thomas Weißgärber
    Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM
  • Prof. Dr. Jens Meinert
    Hochschule Zittau/Görlitz, University of Applied Science
  • Prof. Dr. Bernd Kieback
    Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM