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Mo-W Interdiffusion and the Influence on Potassium Bubbles in W Lamp Wire

Published online by Cambridge University Press:  10 February 2011

B. P. Bewlay ,
C. L. Briant  and
M. L. Murray
B. P. Bewlay
Affiliation:
General Electric Company, Corporate Research and Development Center, Schenectady, NY.
C. L. Briant
Affiliation:
Division of Engineering, Brown University, Providence, RI.
M. L. Murray
Affiliation:
General Electric Company, Corporate Research and Development Center, Schenectady, NY.
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Abstract

The effects of Mo contamination on the microstructure of lamp-grade tungsten wire are investigated in this study. Mo is often used as the mandrel material in the coiling of lamp filaments, and when utilized during high temperature heat treatments significant amounts of Mo can diffuse into the W. In this study, W-Mo diffusion couples were prepared and heat treated at temperatures of 2500°C and above to intentionally contaminate the W with Mo. After dissolution of the Mo and additional high temperature heat treatments of the W, equiaxed grains were observed in the W and excessive porosity was also observed. Explanations for these microstructural changes are discussed. Microprobe data were also obtained to quantify interdiffusion between the W and Mo.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 458: Symposium W – Interfacial Engineering for Optimized Properties , 1996 , 333
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

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