Accession Number:

AD0636954

Title:

LITERATURE SURVEY ON THE SURFACE STRUCTURES OF REFRACTORY METALS WITH REFERENCE TO THE THERMIONIC EMISSION AND ENERGY CONVERTERS.

Descriptive Note:

Corporate Author:

NORTHEASTERN UNIV BOSTON MASS

Personal Author(s):

Report Date:

1966-06-01

Pagination or Media Count:

48.0

Abstract:

The thermionic converter directly transforms heat into electricity. The conversion efficiency of these devices is maximized when the emitter and collector surfaces have optimum work functions that are uniform over the surfaces. This implies a surface consisting of a single type of crystallographic plane. A review of the literature has been made with respect to the surface structures of the refractory metals and the treatments producing these structures. There is direct evidence that single crystals, properly treated, and that well-oriented, properly-treated polycrystalline material can provide surfaces with relatively uniform work functions. There is reason to believe that, with suitable chemi-thermal treatments and induced material transport, one could produce a uniform work function surface on randomly oriented, polycrystalline material. Author

Subject Categories:

  • Electric Power Production and Distribution
  • Ceramics, Refractories and Glass
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE