Dresden 2014 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session

MM 18.11: Poster

Montag, 31. März 2014, 18:00–20:00, P4

Graphitization and interface bonding in carbon-bonded alumina ceramics — •Torsten Weißbach, Masud Alam, Christian Röder, Lilit Amirkhanyan, and Jens Kortus — Institut f. Theoretische Physik, TU Bergakademie Freiberg, 09596 Freiberg

Refractory ceramics reinforced with carbon [1] show an improved resistance to thermal shock, due to the high thermal conductivity of carbon. We present Raman scattering results [2] on these compound materials, which show that carbon is forming graphitic clusters at the surface of the ceramic and that allow for determination of the cluster size of the graphite fractions. In addition, density functional calculations were performed to model the interface between alumina and graphite. By applying an empirical correction for the dispersion interactions [3], we study the different contributions to bond formation in several possible interface geometries. The formation of strong polar bonds is only found at oxygen sites on the surface.

[1] Markus Emmel et al., Ceramics International (2012)

[2] Christian Röder et al., Journal of Raman Spectroscopy, accepted

[3] Stefan Grimme, Journal of Computational Chemistry (2006)