Conclusions
Alkaline slips made of zirconium dioxide stabilized with calcium oxide, which have been obtained by grinding the materials in a rubber-lined zirconium-ball mill, exhibit poor casting properties and a tendency to stratification. The green ware obtained shows a low bulk density of the order of 2.5 g/cm3. The inadvisability of preparing material for casting in this way is further confirmed by the need to restore a large number of the grinding balls which quickly wear out during operation. In order to obtain a uniform degree of fineness of the material, the grinding time for zirconium balls, as opposed to the process in metal mills, should be increased.
A sharp improvement in the casting properties of slip, an increase in the porosity of the green ware and a reduction in shrinkage during firing can be obtained by casting acidic slips treated with hydrochloric acid. This determines the technological advisability of washing the stabilized ZrO2 with acid after grinding, and the possibility, therefore, of grinding for a shorter period in steel metal-ball mills.
The most favorable conditions for casting slip made of stabilized ZrO2 treated with hydrochloric acid are a moisture content of about 30% and a pH value of 1.5–2. Here the densityof the casting is 2.8 g/cm3 and the density of the fired part 5.45 g/cm3. The casting properties of slip are improved and the density of the green ware is raised by 0. 2 g/cm3 if the materials are left to stand for 2 to 4 days after treatment.
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Kalliga, G.P., Kolbasova, V.A. & Poluboyarinov, D.N. Technological features of casting zirconia parts. Refractories 3, 23–28 (1962). https://doi.org/10.1007/BF01300981
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DOI: https://doi.org/10.1007/BF01300981