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HIP of Powder Mixtures

Published online by Cambridge University Press:  15 February 2011

P.D. Funkenbusch  and
E.K.H. Li
P.D. Funkenbusch
Affiliation:
Susumu Onaka, Materials Science Program, Department of Mechanical Engineering, University of Rochester, Rochester, NY 14627–0133, USA
E.K.H. Li
Affiliation:
Susumu Onaka, Materials Science Program, Department of Mechanical Engineering, University of Rochester, Rochester, NY 14627–0133, USA
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Abstract

Models of pressure-sintering and consolidation (such as that found in the HIP process) often assume a uniform spherical powder. However, it is known that use of mixtures, containing particles of differing composition and/or size, alters the initial powder packing and subseguent HIPing behavior. We have experimentally investigated these effects using the simplest form of mixture; a bi-modal powder with various size ratios and particle fractions. Packing experiments confirm the existence of “optimum” packing fractions for which the density is maximized over both monosized and the as-received (continuously distributed) powders. During HIPing these powder mixes remain relatively more dense than monosize packings. The consolidation of composite powder mixtures as well as microstructural evolution during HIP are also discussed. Results are compared with those predicted by modeling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 251: Symposium S – Pressure Effects on Materials Processing and Design , 1991 , 15
Copyright
Copyright © Materials Research Society 1992

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References

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