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Solid Gas Reaction Phase Diagram under High Gas Pressure - HIP Phase Diagram

Published online by Cambridge University Press:  15 February 2011

Kozo Ishizaki
Kozo Ishizaki*
Affiliation:
Nagaoka University of Technology, Department of Materials Science and Technology, School of Mechanical Engineering, Nagaoka, Niigata 940–21, Japan
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Abstract

To evaluate which are the stable phases under high gas pressure conditions, a solid-gas reaction phase diagram under high gas pressure (HIP phase diagram) has been proposed by the author. The variables of the diagram are temperature, reactant gas partial pressure and total gas pressure. Up to the present time the diagrams have been constructed using isobaric conditions. In this work, the stable phases for a real HIP process were evaluated assuming an isochoric condition.

To understand the effect of the total gas pressure on stability is of primary importance: Two possibilities were considered and evaluated, those are: i) the total gas pressure acts as an independent variable, or ii) it only affects the fugacity values. The results of this work indicate that the total gas pressure acts as an independent variable, and in turn it also affects the fugacity values.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 251: Symposium S – Pressure Effects on Materials Processing and Design , 1991 , 3
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

1. Ishizaki, K., Acta. Met. et Mat., 3a, 2059 (1990).Google Scholar
2. Ishizaki, K., in Hot Isostatic Pressing : Theory and Applications edited by Shaefer, R. J., and Unzer, M. (the 2 nd International HIP Conference, NIST, Washington D.C. (1989), ASM International, Materials Park, Ohio, 1991) pp.129–138 Google Scholar
3. Ishizaki, K., in Euro-Ceramics. Processing of ceramics, edited by With, G. de, Terpstra, R. A. and Metselaar, R. (Elsevier Appl. Sci., London and New York, 1, 1989) pp.314–318.Google Scholar
4. Nanko, M. and Ishizaki, K., in Gas Pressure Effects on Materials Processing and Design, edited by Ishizaki, K. et al. (Mater. Res. Soc. Proc. Boston, MA 1991).Google Scholar
5. Sawai, Y., Ishizaki, K., Takata, M. and Narukawa, Y., in Gas Pressure Effects on Materials Processing and Design, edited by Ishizaki, K. et al. (Mater. Res. Soc. Proc. Boston, MA 1991).Google Scholar