Chemical vapor deposition of thoriated tungsten protective cups Page: 18 of 45
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Figure 2. Non-Uniform Structure of Powdered Thoria Entrainment
in Gas Stream 100X
In addition, the thoria entrainment method appeared to be a potential health hazard
to the rig operator.
The deposition of the thoria from thorium acetylacetonate was an entirely different
concept from the powder entrainment method, not only because of the complexity of the
chemistry involved, but because this system would allow the thoria to be chemically made
super fine in situ. The thorium acetylacetonate molecule is Th(C5H7O2)4' which
sublimes at about 1700C. The apparent chemical reaction is probably as follows:
(2) Th(C5H702)4 + 6 WF6 > Th + 8CO + 12CHF3 + 8 H2 +6 W
- -- -.r
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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/m1/18/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.