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Plasma Gas Composition and Pressure Effects on the Sintering of Stabilized Zirconia

Published online by Cambridge University Press:  21 February 2011

P. Kong  and
E. Pfender
P. Kong
Affiliation:
Center for Plasma-Aided Manufacturing, Dept. Of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA.
E. Pfender
Affiliation:
Center for Plasma-Aided Manufacturing, Dept. Of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA.
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Abstract

Yttria stabilized zirconia powder compacts were rapidly sintered in rf plasmas. Final sintered densities varied with plasma gas composition and plasma pressure. The final densities obtained at low pressures were comparable to those obtained at high pressures. This fact can be explained by plasma chemical effects which enhanced sintering at low pressures. Specimen exposure time in the plasma has a minor effect on the final sintered density. The experimental results demonstrates that the powder processing history has a strong influence on the sintering process. Sintered densities exceeding 97% of the theoretical value were obtained in less than 5 minutes in mixed plasmas. X-ray analysis of the sintered specimens shows the formation of single phased cubic solid solutions. SEM analysis of the high density samples shows uniformly fine-grained microstructures with some isolated intragranular micropores. Low density specimens show large open pores along the grain boundaries and at the triple points indicating sintering stops at an early stage.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 190: Symposium M – Plasma Processing and Synthesis of Materials III , 1990 , 71
Copyright
Copyright © Materials Research Society 1991

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References

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