Chemical vapor deposition of thoriated tungsten protective cups Page: 36 of 45
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Between 2600 and 3000 cm/min, the material was a uniform, fine equiaxed grain structure,
as shown in Figure 17, but with grains from 2850 to 3000 cm/min, the as-deposited cups were
extremely frangible probably from the induced stresses. For the multiple mandrel rig, a gas
flow velocity operating range of 2600 to 2850 cm/min should be maintained.
Figure 17. Equiaxed Structure Resulting from Gas Flow Velocity of 2650 cm/min 500X
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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/m1/36/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.