The most common crucible used in the Investment Casting Industry is the 90% Alumina crucible. There are two main manufacturing methods to produce crucibles: thixotropic casting and freeze casting. These methods all produce a crucible with the same relative chemical composition. However, it is the selection of raw materials, forming method, and final processing that directly affects the physical properties of the material and thus the performance of the crucible under melt conditions. This paper examines the physical properties of the different forming methods as tested from various manufacturers' crucibles. The physical properties will then be related to the actual performance of the crucibles under the same melt conditions.
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