Effect of ageing at 1200 degrees C in oxidative environment on the mechanical response of SiOC foams

0448209 - ÚFM 2016 RIV GB eng J - Journal Article
Chlup, Zdeněk - Černý, Martin - Strachota, Adam - Svítilová, Jaroslava - Halasová, Martina
Effect of ageing at 1200 degrees C in oxidative environment on the mechanical response of SiOC foams.
Ceramics International. Roč. 41, č. 7 (2015), s. 9030-9034. ISSN 0272-8842. E-ISSN 1873-3956
R&D Projects: GA ČR GAP107/12/2445; GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081723 ; RVO:61389013 ; RVO:67985891
Keywords : SILICON OXYCARBIDE GLASSES * PARTIALLY PYROLYZED COMPOSITES * PRECERAMIC POLYMER * CERAMIC FOAMS * POLYSILOXANE
Subject RIV: JH - Ceramics, Fire-Resistant Materials and Glass; CD - Macromolecular Chemistry (UMCH-V); JL - Materials Fatigue, Friction Mechanics (USMH-B)
Impact factor: 2.758, year: 2015

Polysiloxane resin was used for development of light weight high temperature resistant foams using the starch foaming technique. The porosity was obtained in the range from 80% to 90%. The pore size effect on the elastic properties was determined and the obtained results were explained with the help of FEM simulation of model situations. The effect of ageing at 1200 degrees C in air on the density and mechanical properties was determined. The ageing changed slightly the density of foams. The elastic modulus decreased by 15% for the dwell time of 2 h. The extension of the dwell time had no additional effect. The compressive strength related to the density keeps the same trend when ageing is applied. The differences between as received and aged microstructure of foams were explained using SEM analysis. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved
Permanent Link: http://hdl.handle.net/11104/0249973