[Zurück]

C. Schrank, B. Schwarz, C. Eisenmenger-Sittner, K. Mayerhofer, E. Neubauer:
"Influence of thermal treatment on the adhesion of copper coatings on carbon substrates";
Vacuum, 80 (2005), 1-3; S. 122 - 127.

Influence of thermal treatment on the adhesion of copper coatings on carbon substrates

C. Schrank a, B. Schwarz a, C. Eisenmenger-Sittner a, K. Mayerhofer b and E. Neubauer c

a Institute of Solid State Physics, E-138, Vienna University of Technology, Wiedner Hauptstrasse 8-10, Vienna A-1040, Austria
b Institute of Chemical Technologies and Analytics, E-164, Vienna University of Technology, Getreidemarkt 9, Vienna A-1060, Austria
c Deptartment of Materials and Production Engineering, ARC Seibersdorf Research GmbH, Seibersdorf A-2444, Austria

Available online 2 September 2005.

Abstract:
Sputter deposited copper (Cu) coatings on plane glassy carbon (C) substrates serve as a model for the interface between Cu- and C-fibres in Cu-C metal matrix composites (MMCs). This interface is of crucial importance for the mechanical and thermal properties of copper carbon MMCs.
If the Cu-coating is deposited on a nitrogen(N)-radiofrequency (RF)-plasma treated C-substrate at room temperature (RT), the adhesion of Cu to C is excellent. In a further step the Cu-coated C-samples are subjected to a thermal treatment at 800 °C under high vacuum conditions for 1 h to partially mimic the hot pressing step involved in the production of real MMCs. This thermal treatment generates a recrystallization induced dewetting process of the Cu coating from the C substrate, which drastically reduces the adhesion of Cu to C.
If a molybdenum-intermediate layer is deposited, no dewetting of the Cu-film takes place, although recrystallization occurs. Additionally the adhesion of the Cu-film is, depending on a minimum thickness of the molybdenum layer, low in the as-deposited state and is strongly increased after the annealing step. SIMS-measurements indicate that this increase is caused by the formation of molybdenum-carbides during the heat treatment.

Keywords: Glassy carbon; Copper; Metal matrix composite; Dewetting; Surface treatment; Molybdenum-intermediate layer

doi:10.1016/j.vacuum.2005.07.031

http://dx.doi.org/10.1016/j.vacuum.2005.07.031