| In Situ Preparation of Zr02-AI20 3-SiCw Ceramic
Composite Powder Mixtures by Carbothermal
Reduction of Silicate Minerals |
L. Mariappan, P. K. Panda, T. S. Kannan and A. M. Umarji
Pages : 68-70
DOI : 10.1080/0371750X.2001.10799969 |
| Abstract |
| Zr02-AI20 3-SiCw composite powder mixtures were prepared by
carbothermal reduction of natural silicates (e.g., zircon,
sillimanite and kaolin). Activated charcoal was used as the reducing
agent. The reactions were carried out in a graphite furnace
at 1650°C in argon atmosphere at a positive pressure of
0.15 MPa. XRD investigation of the product phases confirms the
completion of the reaction and the phases were identified as
monoclinic zirconia, tetragonal zirconia, a-alumina and ~-silicon
carbide. SEM investigation of the powders reveals the
whisker morphology of p-silicon carbide. It was observed that a
small amount of zirconia was present in tetragonal form in addition
to monoclinic form which could be due to fine particle size
of the starting powder. |
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