Some properties of low-vapor-pressure braze alloys for thermionic converters
Conference
·
OSTI ID:5787124
Density, dc electrical resistivity, thermal conductivity, and linear thermal expansion are measured for arc-melted rod-shaped samples of binary eutectics of Zr, Hf, Ru, Nb, Ir, Mo, Ta, Os, Re, and W selected as very-low-pressure braze fillers for thermionic converters. The first two properties are measured at 296 K for Zr-21.7 at.% Ru, Zr-13 wt % W, Zr-19 wt % W, Zr-22.3 at.% Nb, Nb-66.9 at.% Ru, Hf-25.3 wt % Re, Zr-25.7 at.% Ta, Hf-22.5 at.% W, and Nb-35 wt % Mo. The last property is measured from 293 K to 2/3 melting point for specified alloys of different compositions. Resistivities of 0.000055 to 0.000181 ohm-cm are observed with the alloys having resistivities about ten times that of the less resistive constituent metal and about three times that of the more resistive constituent metal, except for Zr-19 wt % W and Nb-35 wt % Mo (greater resistivities). Thermal expansion coefficients vary from 0.000006 to 0.0000105/K. All brazes exhibit linear thermal expansion near that of their constituent metals.
- OSTI ID:
- 5787124
- Report Number(s):
- CONF-780552-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
30 DIRECT ENERGY CONVERSION
300403* -- Thermionic Converters-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
BRAZING
BRAZING ALLOYS
DENSITY
DIRECT ENERGY CONVERTERS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODES
EUTECTICS
EXPANSION
FABRICATION
FILLER METALS
HAFNIUM ALLOYS
IRIDIUM ALLOYS
JOINING
MOLYBDENUM ALLOYS
NESDPS Office of Nuclear Energy Space and Defense Power Systems
NIOBIUM ALLOYS
OSMIUM ALLOYS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
RHENIUM ALLOYS
RUTHENIUM ALLOYS
TANTALUM ALLOYS
THERMAL CONDUCTIVITY
THERMAL EXPANSION
THERMIONIC CONVERTERS
THERMODYNAMIC PROPERTIES
TUNGSTEN ALLOYS
VAPOR PRESSURE
WELDING
ZIRCONIUM ALLOYS
300403* -- Thermionic Converters-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
BRAZING
BRAZING ALLOYS
DENSITY
DIRECT ENERGY CONVERTERS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODES
EUTECTICS
EXPANSION
FABRICATION
FILLER METALS
HAFNIUM ALLOYS
IRIDIUM ALLOYS
JOINING
MOLYBDENUM ALLOYS
NESDPS Office of Nuclear Energy Space and Defense Power Systems
NIOBIUM ALLOYS
OSMIUM ALLOYS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
RHENIUM ALLOYS
RUTHENIUM ALLOYS
TANTALUM ALLOYS
THERMAL CONDUCTIVITY
THERMAL EXPANSION
THERMIONIC CONVERTERS
THERMODYNAMIC PROPERTIES
TUNGSTEN ALLOYS
VAPOR PRESSURE
WELDING
ZIRCONIUM ALLOYS