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An Automated Laboratory Apparatus for the Production of Rapidly Solidified Submicron Powders

Published online by Cambridge University Press:  15 February 2011

Julius Perel ,
John F. Mahoney ,
Scott Taylor ,
Zef Shanfield  and
Carlos Levi
Julius Perel
Affiliation:
Phrasor Scientific, Inc., Duarte, California 91010 USA
John F. Mahoney
Affiliation:
Phrasor Scientific, Inc., Duarte, California 91010 USA
Scott Taylor
Affiliation:
Phrasor Scientific, Inc., Duarte, California 91010 USA
Zef Shanfield
Affiliation:
Phrasor Scientific, Inc., Duarte, California 91010 USA
Carlos Levi
Affiliation:
Phrasor Scientific, Inc., Duarte, California 91010 USA
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Abstract

The Electrohydrodynamic (EHD) method of spraying fine liquid droplets from a liquid state, in a vacuum environment, was developed and used to produce amorphous, microcrystalline, single crystal, bicrystalline and tricrystalline powders. Studies of these powders have contributed towards increasing the knowledge of extended solubility, nucleation, metastable phases, undercooling effects, etc. Coatings and films have been produced by collecting the liquid droplets before solidification. An automated instrument based upon the EHD method, the Micro-Particle Processor, is computer operated and allows a material scientist not completely acquainted with the EHD process to perform sophisticated experiments on materials of his choosing. Electron transparent powders close to 3μm and large powders up to l00μm have been collected and observed. Cooling rates above 107K/s have been achieved. Applications using powders include: new alloy compositions, use as AEM standards, in-situ remelt experiments in the electron microscope, etc.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 8 , 1981 , 131
Copyright
Copyright © Materials Research Society 1982

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Footnotes

†

This work was sponsored by ARPA and monitored by ONR under Contract No. N00014–77-C-0373

*

Present address: Northrop Research & Technology, Palos Verdes, CA

**

Present address: Atisa-Atkins, S.A. de C.V., 11300 Mexico, D.F. Mexico

References

REFERENCES

1.Perel, J., Mahoney, J.F., Kalensher, B.E. and Mehrabian, R., 25th Sagamore Army Materials Research Conference, Edited by Burke, J.T., Mehrabian, R. and Weiss, V. (Plenum Press, New York 1981)p.79.Google Scholar
Perel, J., Mahoney, J.F., Duwez, P., Kalensher, B.E. and Mehrabian, R., Second International Conference on Rapid Solidification Processing, Principles and Technologies, Reston, VA, Edited by Mehrabian, R., Kear, B.H. and Cohen, M. (Claitor's Publishing Div.,Baton Rouge 1980) p. 287.Google Scholar
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