Abstract
Mullite ceramics containing 30 mass% zirconia were rapidly solidified (RS) to obtain amorphous powder using plasma centrifugal atomization. Bending tests and tensile tests were used to assess the high temperature deformation behaviour of samples hot-pressed from RS powder (termed RS specimen). RS specimens were observed to exhibit a higher degree of ductility at 1773 K than in tests conducted at 1723 K. The strain rate sensitivity index (m) was found to be approximately 0.5 for an initial strain rate of 2.5 x 10 -5 S *1 . At the same strain rate, a fracture strain of 80% was achieved at 1773 K, which was attributed to the ultra fine microstructure of the RS material.
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