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PbO Reduction and Crucible Reactions of 70 wt% PbO · 30 wt% B2O3 Glass

Published online by Cambridge University Press:  26 February 2011

Christopher H. Schilling  and
Mark C. Lee
Christopher H. Schilling
Affiliation:
Battelle, Pacific Northwest Laboratory, Richland, WA 99352
Mark C. Lee
Affiliation:
NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
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Abstract

Seventy wt% PbO · 30 wt% B2O3 glass was melted in Pt and graphite crucibles; PbO reduction and subsequent crucible reactions were empirically investigated as a function of temperature and oxygen partial pressure. This research was conducted at NASA to determine optimum processing conditions for subcentimeter glass hollow spheres to be used as inertial confinement fusion targets for a particle beam fusion accelerator at Sandia National Laboratories. The research enables selection of appropriate crucible materials and oxygen partial pressure-temperature combinations necessary to avoid phase separation from PbO reduction and/or crucible reactions. Phase separation from PbO reduction was not detected in glass samples melted in Pt crucibles under oxidizing atmospheres. Under reducing atmospheres from mechanical and diffusion pump vacuum, oxygen gas emissions were detected along with Pb-Pt compounds forming on Pt crucibles. With graphite crucibles, glasses contained lead-rich phases and CO2 gas bubbles. Experimental results were compared with the theoretical Pb-PbO stability boundary predicted on the basis of the standard free energy change of PbO reduction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 87: Symposium O – Materials Processing in the Reduced Gravity Environment of Space , 1986 , 253
Copyright
Copyright © Materials Research Society 1987

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References

1. Kendall, J. M., Lee, M. C. and Wang, T. G., J. Vac. Sci. Tech. 20 (4), 1091 (1982).Google Scholar
2. Kubaschewski, O. and Alcock, C. B., Metallurgical Thermochemistry, Vol. 24, 5th ed. (Pergamon Press 1979).Google Scholar
3. Eagan, R. J. and Bergeron, C. G., Proc. Symp. Nucleation and Crystal Growth, April 1971, Hench, L. L., ed., Amer. Ceram. Soc. Inc., pp. 202–209.Google Scholar
4. Eagan, R. J. and Bergeron, C. G., J. Amer. Ceram. Soc., Jan. 1972, pp. 53–54.Google Scholar
5. Hansen, M., Constitution of Binary Alloys (McGraw-Hill, New York, 1958), p. 1097.Google Scholar
6. Kapoor, J. L. and Frohberg, M. G., Canadian Met. Quart., 12, 137 (1973).Google Scholar