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The need for cleanliness and tighter control over the content and size of nonmetallic particulates (inclusions) in superalloys is a real and severe one. The newer, advanced superalloys for jet engines are continually being subjected to significantly higher stresses and service temperatures than their earlier predecessors. As a result, the tolerance levels for defects in these alloys has markedly decreased in recent years. Defects ranging from 0.05 0.76 mm (0.002-0.03 inches) can be of critical size in highly alloyed superalloys operating under highly stressed LCF conditions. Such defects are one to two orders of magnitude smaller than those tolerated by the conventionally processed wrought alloys (1).

Utilization of Ceramic Filters to Produce Cleaner Superalloy Melts