Transactions of the INDIAN CERAMIC SOCIETY Vol. 59 2000
Phase Transformation of Sol-Gel Derived Zr02-2RE203
(RE = Sm, Gd and Dy) Spun Fibres by Ageing
in Humid Atmosphere
M. K. Naskar, M. Chatterjee and D. Ganguli Pages : 37-40
DOI : 10.1080/0371750X.2000.10799905
Abstract
Zirconia fibres doped with 2 equivalent mol% of RE20 3 (RE =
Sm, Gd and Dy) were prepared by spinning of acetate derived
sols followed by calcination of the gel fibres thus obtained at
900°·1300°C for 1 h. The oxide fibres were characterized by X-ray
diffraction (XRD) analysis. The fibres containing only tetragonal
(t) phase were aged under controlled humidity at 150°-300°C for
8 h and in addition at 200°C for 2 and 5 h. The aged samples
were then characterized by XRD analysis. Dy3 doped zirconia
showed the maximum tendency to undergo phase transformation
from tetragonal (t) to monoclinic (m) phase because of its
increased tendency for hydrolysis.
