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Sintered fused silica based composites

E. VOLCEANOV1,* , R. NEAGU1, A. VOLCEANOV2, C. PLĂPCIANU3, B. MATOVIC4, H. NICIU5, C. VALSANGIACOM3

Affiliation

  1. Metallurgical Research Institute-ICEM SA, Bucharest, Romania
  2. University Politehnica of Bucharest, Romania, Faculty of Applied Chemistry and Materials Science
  3. National Institute for Materials Physics,Măgurele-Bucharest, Romania
  4. Institute of Nuclear Science "Vinca", Belgrade, Serbia
  5. National Institute for Glass, Bucharest, Romania

Abstract

In present work, complex mixtures were designed based on fused SiO2 , β-SiC and different oxide additives. The addition of Al2O3 and mulite - 3Al2O3 .2SiO2 influence was investigated in order to obtain high temperature strength, thermal shock resistant and corrosion resistant composites. Thermal treatment was conducted in conventionally electric furnace in air and in argon respectively, in the 800-1250 oC temperature range. Sintered composites were characterised by bulk density, open porosity, and thermal shock resistance and thermal expansion measurements. The crystalline phase evolution in conjunction with each heat curing procedure was analysed by X-ray diffraction and FTIR spectrometry. Microstructure investigation of sintered samples was carried using scanning and transmission electron microscopy. The relationship between the FTIR spectra and structure of the powders and sintered composites was explained..

Keywords

Vitreous silica, Silicon carbide, Composite, Thermal shock resistance.

Submitted at: Aug. 28, 2008
Accepted at: Dec. 10, 2008

Citation

E. VOLCEANOV, R. NEAGU, A. VOLCEANOV, C. PLĂPCIANU, B. MATOVIC, H. NICIU, C. VALSANGIACOM, Sintered fused silica based composites, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3225-3228 (2008)