Chemical vapor deposition of thoriated tungsten protective cups Page: 34 of 45
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
5. PROCESS SCALE-UP
The final phase of this program was to scale the process up in order to improve both
the economics and the rate of production for potentially fabricating a reactor quantity of parts.
A CVD rig was tooled so that the plating gases would pass over a set of 6 molybdenum
mandrels. These were held piggyback in a special 3-pronged rotating candelabra which was
supported in a 90 millimeter Vycor reaction chamber.
The initial trial, multiple mandrel run was conducted with the gas flow velocity
proportioned upward from the single cup chamber; the temperature and pressure were maintained
the same. At this gas velocity of 2200 cm/min, the grains were primarily large and elongated
as shown in Figure 15.
Figure 15. Columnar Type Structure Produced with a Gas Flow
Velocity of 2200 cm/min 100X
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
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/m1/34/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.