Journal of Materials Science

, Volume 43, Issue 13, pp 4466–4474 | Cite as

SiOC ceramic foams synthesized from electron beam irradiated methylsilicone resin

  • R. M. RochaEmail author
  • E. A. B. Moura
  • A. H. A. Bressiani
  • J. C. Bressiani


A new method to prepare silicon oxycarbide (SiOC) foams has been developed and it consists of electron beam irradiation of a methylsilicone preceramic polymer followed by pyrolysis in an inert atmosphere. Methylsilicone resin foams were prepared by simultaneous curing and foaming, without the addition of calalysts or blowing agents. The polymer precursor was irradiated with 1.5 MeV EB up to a dose of 7.0 MGy and at a dose rate of 2.8 kG/s, in air. During irradiation the polymer melted, due to rapid increase in temperature, and simultaneously crosslinked by interaction with the ionizing radiation. Crosslinking occurred mainly by poly-condensation reactions and gaseous condensation products were released. The latter acted as an intrinsic foaming agent in the molten polymer. Foams obtained with radiation doses higher than 3.5 MGy showed a high degree of crosslinking with a ceramic yield of over 89% at 1,000 °C. Pyrolysis at 1,200–1,500 °C resulted in SiOC ceramic foams with dense struts and walls, with bulk density around 0.3 g/cm3 and total porosity of 84%. Foams pyrolyzed at 1,200 °C revealed compression strength of 6.8 MPa.


Foam PDMS Compression Strength Crosslinking Reaction Methylsilicone 



The authors gratefully acknowledge Carlos Gaia da Silva and Elizabeth S. R. Somessari for performing the EB irradiations.


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • R. M. Rocha
    • 1
    Email author
  • E. A. B. Moura
    • 2
  • A. H. A. Bressiani
    • 2
  • J. C. Bressiani
    • 2
  1. 1.Comando-Geral de Tecnologia AeroespacialCTA-IAE-Divisão de Materiais, Pça. Marechal do Ar Eduardo GomesSao Jose dos CamposBrazil
  2. 2.IPEN/CNEN-SPInstituto de Pesquisas Energéticas e NuclearesSao PauloBrazil

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