Chemical vapor deposition of thoriated tungsten protective cups Page: 22 of 45
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Figure 5. Typical Recrystallized Fine, Equiaxed Grain Structure 500X I
To deposit a cup to the inside dimensional requirements of the drawing, including
inside flatness, it was determined that stainless steel mandrels, the material usually used for
tungsten plating substrates, could not be used. The cool gases, impinging on top of the
stainless steel mandrel, caused a localized surface cooling. This in turn caused the initial
very thin thoriated tungsten plate to separate from the mandrel. Continued deposition
resulted in a slightly dome-shaped as-deposited cup with a flatness outside the drawing require-
ments, as the surface tapered toward the center. Subsequent machining of the outside flat
resulted in the inside and outside surfaces not being parallel in addition to the dome shape of
the inside tapering toward the central hole in a decreasing wall thickness.
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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/m1/22/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.