Additive-free low temperature sintering of amorphous SiBC powders derived from boron-modified polycarbosilanes: Toward the design of SiC with tunable mechanical,electrical and thermal properties |
| |
| Affiliation: | 1. Univ. Limoges, CNRS, IRCER, UMR 7315, F-87000, Limoges, France;2. Chemical Engineering, Federal University of Santa Catarina, 88010-970, Florianópolis, Brazil;3. Institute of Inorganic Chemistry, Slovak Academy of Sciences, 84536, Bratislava, Slovakia;2. European Ceramic Society, Belgium;1. Institute of Materials Research of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko?ice, Slovakia;2. Advanced Technologies Research Institute, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 91724 Trnava, Slovakia;1. University of Bayreuth, Ceramic Materials Engineering (CME), Ludwig-Thoma-Straße 36b, 95447, Bayreuth, Germany;2. Bayerisches Laserzentrum GmbH, Konrad-Zuse-Straße 2-6, 91052, Erlangen, Germany;3. Friedrich-Alexander-Universität Erlangen-Nürnberg, Institute of Photonic Technologies, Konrad-Zuse-Straße 3-5, 91052, Erlangen, Germany;4. Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul Gordan Straße 6, 91052, Erlangen, Germany;1. Yokohama National University, Yokohama, Japan;2. Kanagawa Institute of Industrial Science and Technology, Ebina, Japan |
| |
| Abstract: | Additive-free SiC ceramics are prepared from polymer-derived powders with Si, C and B elements homogeneously distributed on the atomic level by rapid hot-pressing at 1750 °C and 1800 °C under argon and a load of 50 MPa. As-sintered samples display a Vickers hardness in the range of 9.6 ± 0.5 GPa–17.3 ± 1.9 GPa and an elastic modulus varying from 137 ± 3.4 GPa to 239 ± 6 GPa, both depending on the sample phase composition, crystallinity and porosity. Accordingly, the electrical conductivity changes from 340 to 3900 S/m whereas the thermal conductivity varies from 17.7 to 45.1 W/m?K as a function of these characteristics. Thus, we demonstrated that a polycarbosilane containing 0.7 wt.% of boron could produce boron-doped SiC powders that demonstrate tailored sinterability at temperatures as low as 1750 °C to form nearly dense SiC ceramics with adjusted hardness, Young’s modulus, electrical and thermal conductivities. |
| |
| Keywords: | Rapid hot-pressing Polymer-derived ceramics SiC Boron Functional properties |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
