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Carbon Mobility in SiOC / HfO 2 Ceramic Nanocomposites
Author(s) -
nenmacher Katharina,
Kleebe HansJoachim,
Rohrer Jochen,
Ionescu Emanuel,
Riedel Ralf
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12440
Subject(s) - nanocomposite , ceramic , materials science , annealing (glass) , transmission electron microscopy , carbon fibers , composite material , chemical engineering , nanotechnology , composite number , engineering
Silicon oxycarbide/hafnia ( SiOC / HfO 2 ) ceramic nanocomposites were studied by transmission electron microscopy ( TEM ) upon isothermal annealing at 1300°C for 1–200 h. TEM investigations in conjunction with energy‐dispersive X ‐ray spectroscopy ( EDS ) analysis revealed a pronounced reduction in the local carbon content in close proximity to internal surfaces. Such small microcracks are a consequence of the polymer‐to‐ceramic transition and, hence, are commonly formed upon thermal annealing. The profiles of the carbon content between surface and bulk were analyzed employing error functions to yield carbon diffusivities.