| Sol-Gel Synthesis and Characterization of Zirconia
and Yttria Stabilized Zirconia Powders |
RAJIV DAYAL, N. M. GOKHALE, s. c. SHARMA
AND RAMJI LAL
Pages : 58-62
DOI : 10.1080/0371750X.1989.10822947 |
| Abstract |
| Powders of pure zirconia and zirconia containing 3 mol% yttria
were prepared by sol-gel transformation followed by calcination
techniques. The powders were characterized for their purity, chemical
homogeneity, thermal behaviour, particle size, surface area, crystallite
size and content of the tetragonal and monoclinic phases. The
results show that as-prepared powders were of high purity, chemically
homogeneous, X-ray amorphous and contained sub-micron particles.
Addition of yttria increased the temperature stability of the tetragonal
phase, while the critical crystallite size for the transformation remained
unchanged. Yttria stabilized zirconia powders could be hotpressed
to 97% theoretical density at 1450°C and the sintered body
consisted of uniform 0.70 JLm grains having about 45% tetragonal
phase. |
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