Characterization of oxycarbide glasses prepared by melt solidification

R. Ramesh, P. Chevaux, H. Lemercier, M. J. Pomeroy, S. Hampshire

Research output: Contribution to journalArticlepeer-review

Abstract

Oxycarbide glasses in the Y-Si-Al-O-C system were successfully prepared at 1500°C by melt solidification techniques while glasses prepared at 1600 & 1700°C foamed resulting in a spongy material. For a fixed cation composition (16.5Y: 56Si: 27.5Al in eq.%) varying O:C ratios corresponding to carbon contents of 1, 2, 2.5, 5 and 10 eq.% were chosen to determine the solubility limit of carbon in this system. Properties such as density, microhardness, elastic modulus and glass } transition temperature were measured for glasses made at 1500°C and found to increase up to 2 eq.% addition of carbon. X-ray diffraction analysis carried out on all these glasses revealed the existence of SiC peaks except for the 1 and 2 eq.% carbon containing composition. 2 eq.% carbon appears to be the solid solubility limit for carbon in these yttrium alumino-silicate liquids at J 1500°C. The devitrification studies carried out using differential thermal analysis (DTA) and tube furnace heat treatment indicated heterogeneous nucleation mechanism with yttrium disilicate and mullite being the predominant phases formed.

Original languageEnglish
Pages (from-to)189-192
Number of pages4
JournalKey Engineering Materials
Volume132-136
Publication statusPublished - 1997

Keywords

  • Devitrification
  • Melting
  • Nucleation
  • Oxycarbide

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