Abstract
ABSTRACTCrucibles were made from thorium oxide by casting from a slip made according to ceramic practice. The presence of cryolite in the slip insured its successful use. These were fired to 1885°C in a gas furnace of special construction. The addition of zirconium oxide makes a crucible easier to manufacture. The finished crucibles were successfully used in vacuum‐induction furnaces to melt pure metals to 2300°C. No contamination of the metals resulted.Expansion curves indicate a peculiar action of the crucibles made with zirconium oxide in the 700 to 900° region. The mean coefficient of expansion of fused thoria is found to be 93 × from 0 to 600°C.These crucibles are found to be (a) fairly resistant to chemical reagents, but not enough so for chemical work and (b) resistant to wetting of molten metals of high melting point.
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