Isotec final report
General Atomic (GA) developed processes to prepare NdSe/sub 1.5-x/. The partial pressure of Se/sub 2/ above the NdSe/sub 1.5-x/ was found to be a function of x. The thermoelectric properties and the friability of the hot pressed element were also a function of x. Process modification changed the value of x, providing a method to control the properties of N-type NdSe/sub 1.5-x/ elements. A method of joining NdSe/sub 1.5-x/ to a nickel hot cap was developed using a gold foil intermediate. NdSe/sub 1.5-x/ was diffusion-bonded to PbTe by the same process developed for Gd/sub 2/Se/sub 3/. Couples were fabricated from (Cu,Ag)/sub 2/Se/Fe/(Bi,Sb)/sub 2/Te/sub 3/ and NdSe/sub 1.5-x/ PbTe elements. Limited couple test data were obtained. General Atomic examined methods to develop high-efficiency couples made from segmented elements containing (Cu,Ag)/sub 2/Se P-type material and NdSe/sub 1.5-x/ N-type material. Techniques were developed to reproducibly prepare and hot press (Cu,Ag)/sub 2/Se segments and elements with a metallurgically joined MoRe hot cap. This hot cap and a W-26/Re wire mesh used to make the hot cap junction were found to be stable in contact with (Cu,Ag)/sub 2/Se at 750/sup 0/C. Stability of (Cu,Ag)/sub 2/Se to current flow in a thermal gradient was examined. This report describes specifications for vapor suppression to improve the stability of P-type (Cu,Ag)/sub 2/Se in thermal gradient life tests and presents life test information on match-loaded (Cu,Ag)/sub 2/Se and (Cu,Ag)/sub 2/Se/Fe/(Bi,Sb)/sub 2/Te/sub 3/ elements.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- DOE Contract Number:
- AT03-76ET33004
- OSTI ID:
- 5437033
- Report Number(s):
- GA-A-16584; ON: DE82015077; TRN: 82-013511
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
07 ISOTOPES AND RADIATION SOURCES
ANTIMONY TELLURIDES
FABRICATION
THERMOELECTRIC PROPERTIES
BISMUTH TELLURIDES
COPPER SELENIDES
NEODYMIUM COMPOUNDS
SELENIDES
SILVER SELENIDES
THERMOELECTRIC GENERATORS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HOT PRESSING
LEAD TELLURIDES
N-TYPE CONDUCTORS
P-TYPE CONDUCTORS
PERFORMANCE TESTING
RADIOISOTOPE HEAT SOURCES
SERVICE LIFE
STABILITY
TEMPERATURE GRADIENTS
THERMOCOUPLES
ANTIMONY COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
DIRECT ENERGY CONVERTERS
HEAT SOURCES
LEAD COMPOUNDS
MATERIALS
MATERIALS WORKING
MEASURING INSTRUMENTS
PHYSICAL PROPERTIES
PRESSING
RARE EARTH COMPOUNDS
SELENIUM COMPOUNDS
SEMICONDUCTOR MATERIALS
SILVER COMPOUNDS
TELLURIDES
TELLURIUM COMPOUNDS
TESTING
TRANSITION ELEMENT COMPOUNDS
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