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Sintering Behavior of Ba2CaWO6-Doped-Tungsten

Published online by Cambridge University Press:  25 February 2011

J.A. Ruud  and
B.P. Bewlay
J.A. Ruud
Affiliation:
General Electric Company, Corporate Research and Development Center, Schenectady, NY 12301
B.P. Bewlay
Affiliation:
General Electric Company, Corporate Research and Development Center, Schenectady, NY 12301
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Abstract

The sintering behavior of Ba2CaWO6 co-sintered with W powder was investigated. Measurements of density and mass loss of sintered compacts showed that the Ba2CaWO6-doped-W had a lower density than undoped W and that there was little volatilization of Ba2CaWO6 at temperatures below 1750 °C. The activation energies for densification of Ba2CaWO6-doped-W and undoped W were both measured to be 389 kJ/mol, which indicates the same densification mechanism, grain boundary diffusion, operated for both materials. The reduced densification kinetics of the Ba2CaWO6-doped-W was probably due to increased coarsening in the early stages of sintering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 553
Copyright
Copyright © Materials Research Society 1994

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