Effect of Ti concentration on the structure and texture of SiTiOC glasses
- Dpt. Ing. Metalurgica. ESIQIE-Instituto Politecnico Nacional. Zacatenco, 07738 Mexico D.F. (Mexico)
- Instituto de Ceramica y Vidrio. C.S.I.C. Campus de la Universidad Autonoma de Madrid, Canto Blanco 28049, Madrid (Spain)
Five different silicon-titanium organic-inorganic hybrid materials were prepared by the reaction of tetraethoxysilane, titanium tetrabutoxide and silanol-terminated polydimethylsiloxane. Si-Ti oxycarbide glasses were prepared by pyrolysis of the hybrid materials in nitrogen atmosphere in the range of 400 to 1500 deg. C. The obtained Si-Ti oxycarbide materials were characterized by Fourier Transform-Infra Red spectroscopy, X-ray-diffraction, mercury porosimetry and SEM. The study indicated that the reactivity towards water increases up to 1000 deg. C, at higher temperatures it decreases for all samples. During the pyrolysis, Ti atoms were incorporated into the silicate network leading to the formation of Si-Ti oxycarbide glasses, except with sample containing 7% of Ti which presented also the formation of {beta}-SiC and TiC crystalline phases. The porosity was increased up to 600 deg. C and then decreased tending to disappear at 1500 deg. C. When the titanium concentration increased from 1 to 3% in the oxycarbide glass, the porosity decreased; for higher concentration, an increase in the porosity was observed.
- OSTI ID:
- 22066097
- Journal Information:
- Materials Characterization, Vol. 60, Issue 6; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
Similar Records
Porous silicon oxycarbide glasses
{sup 29}Si, {sup 17}O liquid NMR and {sup 29}Si CP-MAS NMR characterization of siloxane-oxide materials, [(CH{sub 3}){sub 2}SiO/TiO{sub 2}, (CH{sub 3}){sub 2}SiO/ZrO{sub 2}]