| Synthesis of Polycrystalline Zr02-Ca0 Fibres by Sol-Gel
Processing and their Characterization |
M 0 CHATIERJEE, M. K. NASKAR AND D. GANGULI
Pages : 51-55
DOI : 10.1080/0371750X.1993.10804574 |
| Abstract |
| Polycrystalline zirconia fibres containing 0-20 mol% CaO were
synthesized by the sol-gel technique. Gel fibres of up to about
70-80 em length and 15-20 micrometer diameter were produced
at ambient temperature from spinnable acetate sols made from
zirconium oxychloride. Oxide fibres were obtained by calcining
the precursor gel fibres at 1000°·C. The gel and calcined fibres
were characterized by FTIR studies, differential thermal
analysis/thermogravimetry, X-ray diffractometry and optical
microscopy. Complete removal of the acetate groups at soo•c
was confirmed by FTIR studies. Zr02-Ca0 fibres were found to
contain only tetragonal (t-) and cubic (c-) forms of Zr02 after
heating at 1000°C. The crystallite size of Zr02 in such fibres
showed an inverse relationship with increase in CaO-content. |
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