Chemical vapor deposition of thoriated tungsten protective cups Page: 15 of 45
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as a super fine dispersion within the tungsten grains instead of just at the grain boundaries as
occurs in conventional blended tungsten-thoria powder metallurgy alloys. It was concluded
that, to varying degrees, all six methods would require a development effort to manufacture
the thoriated tungsten cup to WANL requirements. The desired Westinghouse W-Special alloy
was very difficult to sinter and extrude into a high-density wrought product in the size required
to manufacture cups. Material that was successfully extruded had marginal wrought densification
and exhibited strength properties 30 to 50 percent lower than that reported for the alloy, and
the recrystallization characteristics were markedly inferior. An alternate approach for manu-
facturing this super fine dispersed thoria within the grains of tungsten appeared to be by chemical
vapor deposition techniques, which for refractory metals have recently progressed rapidly.
They are recognized as an economical means for fabricating high density, high purity, thin
wall, tungsten tubing and crucibles. This technique, by its very nature, should be capable of
producing an alloy in which super fine thoria particles are dispersed within the co-deposited
tungsten grains, producing a Westinghouse W-Special type alloy. This investigation was made
for the purpose of developing a chemical vapor deposition process for co-depositing a tungsten-
2 percent super fine thoria dispersion alloy in a protective cup configuration.
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Blay, J.S. Chemical vapor deposition of thoriated tungsten protective cups, report, January 1, 1968; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc1026564/m1/15/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.