Conclusions
A new technique has been developed for making crucibles from calcium oxide by casting an alcohol suspension in ceramic molds. The crucibles cast in these molds are prefired at 1000–1100°. The temperature of the final firing is 1650°.
The porosity of the crucibles depends on the firing temperature of the compacts and the addition of the titanium dioxide. The best firing temperature for compacts is 1500–1550°, and the optimum amount of titanium dioxide to be added is 1.5%.
When made, the crucibles should be kept in desiccators; crucibles made of pure calcium dioxide in the paraffined form and those with the addition of titanium dioxide can be kept uncovered for about 6 months.
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