Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10629696 | Journal of the European Ceramic Society | 2012 | 10 Pages |
Abstract
Dense silicon oxycarbide glasses (SiOC) have been produced by spark plasma sintering (SPS) of SiOC powders. Raw powders were obtained by pyrolysis under nitrogen at 1100 °C of tetraethylorthosilcate/polydimethylsiloxane (TEOS/PDMS) hybrids. SPS experiments were carried out at 1300 and 1500 °C at 10 and 80 MPa and then were studied by chemical analysis, 29Si and 13C MAS NMR, ATR, Raman, XRD, FE-SEM, density, porosity, microhardness (Hv) and thermal conductivity (K). The SiOC materials are formed by SixOC4âx units within a silica matrix where silicon carbide and graphite nanodomains are also present. After the SPS treatment the silicon carbide crystallite size is close to 2.5 nm. At 1300 °C and 1500 °C the carbon nanodomain size is close to 3 nm and 2 nm, respectively. Hv values vary from 3.4 to 9.15 GPa, for 30% and 1% of porosity, respectively. Finally, K is always close to 1.38 W mâ1 Kâ1.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
M. Alejandra Mazo, Cristina Palencia, Andrés Nistal, Fausto Rubio, Juan Rubio, José Luis Oteo,