| Partial and Full Stabilization of Zirconia by Calcium
Chloride and Bromide Additives |
A. N. VIRKAR, B. MONDAL AND A. PAUL
Pages : 111-115
DOI : 10.1080/0371750X.1987.10822846 |
| Abstract |
| Partial and full stabilization of zirconia was attempted by using
stabilizers like calcium chloride and bromide (10, 15 and 20 mol%).
The green mixture was heated in powder form in the temperature
range of 300~ to 1300oC. The stabilization was studied through thermal
analysis and powder X-ray diffraction techniques. The green mixture
showed crystallinity only above 300C. Crystal size increased with
increase in calcination temperature. Calcined samples showed the
presence of cubic/tetragonal phase along with a certain amount of
monoclinic phase at room temperature. The intensity of the compound
peak (30.2 28), where 10 mol% CaCI2 was used as stabilizer, increased
rapidly with temperature up to 550T, while in case of CaBr2 stabilizer
it increased rapidly up to 750C. Above these temperatures, marginal
increase in intensity was observed in both the cases. A comparative
study shows that below 800°C firing temperature, CaCI2 was more
effective than CaBr2• However, above this temperature the reverse was
observed. In case of 15 and 20 mol% CaCI, addition, formation
of the cubic phase took place at 1550° and 1300°C respectively.
However, 20 mol% CaBr2 addition resulted in cubic and CaZrO,
phase formation. |
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