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Efficient Densification of Fine-Grained Ceramics by Hybrid (RCS-Plus-HIP) Processing

Published online by Cambridge University Press:  15 February 2011

Hayne Palmour III ,
Thomas M. Hare  and
Roger L. Russell
Hayne Palmour III
Affiliation:
Dept. of Mat'ls Science & Engr'g, North Carolina State University, Raleigh, NC 27695–7907
Thomas M. Hare
Affiliation:
Dept. of Mat'ls Science & Engr'g, North Carolina State University, Raleigh, NC 27695–7907
Roger L. Russell
Affiliation:
RCS Technologies, Inc., 3410 Hillsborough St., Raleigh, NC 27607
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Abstract

In this paper, we consider certain technological and economic advantages associated with rate controlled sintering (RCS) as the critical first step in a two-step hybrid densification cycle: RCS-plus-HIP. With proper combinations of(a) powder processing (to obtain narrow initial particle size distribution and high green density) and (b) carefully optimized RCS sintering profile (to assure effective pore closure with minimal grain growth), one can readily produce technically dense (gas-tight) sintered ceramic components that can then be rather easily HIPed to full density with very little additional grain growth.

The experimental background and underlying concepts for RCS are briefly reviewed, and are related to the broader issue of establishing and maintaining control of microstructural evolution during densification processes, including those that are best concluded in the high pressure gas atmospheres typically employed for hot isostatic pressing (HIP). To illustrate these points, some examples of RCS-plus-HIP processed oxide ceramics – dense, optically translucent and/or transparent, yet also quite uniformly fine-grained – are shown and discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 251: Symposium S – Pressure Effects on Materials Processing and Design , 1991 , 211
Copyright
Copyright © Materials Research Society 1992

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References

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