Accession Number:

AD0608554

Title:

A STUDY PROGRAM ON CESIUM VAPOR FILLED THERMIONIC CONVERTERS HAVING HIGH VACUUM WORK FUNCTION EMITTER MATERIALS.

Descriptive Note:

Yearly summary rept. for 1 Nov 63-31 Oct 64,

Corporate Author:

MARTIN CO BALTIMORE MD

Personal Author(s):

Report Date:

1964-10-31

Pagination or Media Count:

81.0

Abstract:

Ruthenium, a material having relatively low neutron absorption cross section, was investigated both as an emitter and collector in a thermionic converter. Both hot pressed and plasma sprayed ruthenium emitters were found to behave like high vacuum work function materials i.e., display high output current densities at relatively low cesium pressures. Significant differences were noted, however, in the performance of the two ruthenium emitters prepared by the different processes. The performance of the ruthenium emitters is compared to that of iridium and rhenium emitters. Generally, the ruthenium data shows a higher output power density, particularly at relatively wide 10 to 30 mil interelectrode gaps. The ruthenium plasma sprayed collector assumes its minimum value at a temperature which is lower than that for a molybdenum collector by approximately 100K. The value of collector work function at optimum is indicated to be approximately equal for ruthenium and molybdenum. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE