Abstract
Alumina and partially stabilized ZrO2—with and without Al2O3—have been sintered in a radio frequency induction coupled plasma system. Translation speed of the specimens through the plasma, power level, sintering additives and pressure into the reaction tube were investigated as the experimental variables to elucidate the sintering mechanism(s). Both Al2O3 and partially stabilized Y2O3 + ZrO2 rods have been sintered with final densities greater than 99.7% at a very high densification rate. The grain sizes of the sintered specimens were smaller by a factor of two than the same materials sintered in a non-plasma environment. Specimen temperatures were found to be a function of plasma-supporting gas pressure, applied power and translation speed of the specimens. In the case of partially stabilized ZrO2 in Ar plasma, temperatures increased with the increase in the TS of the specimen up to 6 cm/min.
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