Abstract
Authors test an Al#72O#73-based and two Si#73N#74-based ceramics in three common workpieces. The molten metals consist of Fe-Ni alloys and two Ni-based superalloys. Results show Al#72O#73 is resistant to all three metals, but the other two are attacked. The suggested mechanism is diffusion into the metal via the grain boundary phase with subsequent dissolution of Si#73N#74 grains.