Surface strengthening of extrusion-formed polymer/filler-derived ceramic composites
Schlier L, Travitzky N, Gegner J, Greil P (2012)
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2012
Journal
Publisher: Goeller Verlag GmbH
Book Volume: 3
Pages Range: 181-188
Journal Issue: 4
Abstract
Surface nitridation of extrusion-formed Fe-Si-Cr-filler-loaded polysiloxane polymer filaments was investigated. After the filaments were exposed to a nitrogen atmosphere at temperatures above 1000 °C, a gas-solid reaction caused the formation of a nitridation reaction layer covering the filament surface. Thermo-chemical calculations of equilibrium phase compositions at different nitrogen activity suggest the formation of SiN O and SiN near the filament surface (high nitrogen content) whereas SiC and unreacted CrSi and FeSi dominate in the core region (low nitrogen content), which was confirmed by means ofXRDanalyses. Compared to filaments annealed in an inert Ar atmosphere (no nitride reaction layer), specimens covered with a nitride surface layer of only 20 μm in thickness obtained a bending strength increment of + 35%(mean fracture stress 400 MPa). The improved mechanical properties were attributed to a pronounced volume increase triggered by the nitride reaction, which gives rise to pore filling and crack healing. Since post-fabrication treatment in a reactive atmosphere is independent of the component shape and size, formation of a surface reaction zone with densified microstructure (reduced porosity and flaws) may offer a versatile route for improving the properties of bulk polymer-filler-derived ceramic components. © 2012 Göller Verlag.
Authors with CRIS profile
Lorenz Schlier
Lehrstuhl für Glas und Keramik
Nahum Travitzky
Lehrstuhl für Glas und Keramik
Peter Greil
Lehrstuhl für Glas und Keramik
Additional Organisation(s)
Involved external institutions
Germany (DE)How to cite
APA:
Schlier, L., Travitzky, N., Gegner, J., & Greil, P. (2012). Surface strengthening of extrusion-formed polymer/filler-derived ceramic composites. Journal of Ceramic Science and Technology, 3(4), 181-188. https://dx.doi.org/10.4416/JCST2012-00018
MLA:
Schlier, Lorenz, et al. "Surface strengthening of extrusion-formed polymer/filler-derived ceramic composites." Journal of Ceramic Science and Technology 3.4 (2012): 181-188.
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