| The influence of amount of calcia addition and calcination temperature
on the sintering characteristics of zirconia was studied. The
extent of stabilization was studied by X-ray diffraction. It was noticed
that the optimum amount of calcia addition to obtain high density
without cracking was 0.50 to 0.75 wt%. Higher amount of calcia
addition and higher calcination temperature resulted in lowered
density.
Stabilization of zirconia with calcia addition, i.e. the formation of
cubic phase, is found to be a function of amount of calcia added. The
cubic solid solution formation took place mainly between 1000° and
1200°C. With the addition of 5.0 wt% of CaO, about 85% of cubic
phase is formed at 1200°C and 100% at 1700°C. |
