Internal stresses and voids in SiC particle reinforced aluminum composites for heat sink applications |
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Authors: | M Schöbel W AltendorferHP Degischer S VaucherT Buslaps M Di MichielM Hofmann |
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Affiliation: | a Institute of Materials Science and Technology, Vienna University of Technology, Karlsplatz 13, A-1040 Vienna, Austria b Laboratory Materials Technology, EMPA, Feuerwerkstrasse 39, CH-3602 Thun, Switzerland c European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, F-38043 Grenoble, France d Forschungsneutronenquelle Heinz Maier-Leibnitz, Lichtenbergstrasse 1, G-85747 Garching, Germany |
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Abstract: | Metal-matrix composites (MMC) are being developed for power electronic IGBT modules, where the heat generated by the high power densities has to be dissipated from the chips into a heat sink. As a means of increasing long term stability a base plate material is needed with a good thermal conductivity (TC) combined with a low coefficient of thermal expansion (CTE) matching the ceramic insulator. SiC particle reinforced aluminum (AlSiC) offers the high TC of a metal with the low CTE of a ceramic. Internal stresses are generated at the matrix-particle interfaces due to the CTE mismatch between the constituents of the MMC during changing temperatures. Neutron and synchrotron diffraction was performed to evaluate the micro stresses during thermal cycling. The changes in void volume fraction, caused by plastic matrix deformation, are visualized by synchrotron tomography. The silicon content in the matrix connecting the particles to a network of hybrid reinforcement contributes essentially to the long term stability by an interpenetrating composite architecture. |
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Keywords: | A Metal-matrix composites B Thermal properties B Porosity/voids C Residual stress D Non-destructive testing |
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