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

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...

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Bibliographic Details
Published in:Ceramics international 2015-08, Vol.41 (7), p.9030-9034
Main Authors: Chlup, Zdeněk, Černý, Martin, Strachota, Adam, Svítilová, Jaroslava, Halasová, Martina
Format: Article
Language:English
Subjects:
Ageing
Aging
C. Mechanical properties
Compressive strength
Computer simulation
Density
Dwell time
Foam
Foaming
Foams
Porosity
Pyrolysis
SiOC
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Summary: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°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 2h. 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.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2015.03.273