Accession Number : AD0276005

Title :   THERMOELECTRIC MATERIALS

Corporate Author : TRANS WORLD AIRLINES INC KANSAS CITY MO

Report Date : 03 JUL 1961

Pagination or Media Count : 1

Abstract : As a practical result of the contractual work on N-type thermoelement CoSi + 1% FeSi and P-type thermoelement Cr0.05 Mn0.95 i2 + 2% Ag were developed. These aterials, like most of the transition metal silicides, are stable thermally. Bonding experiments suggest that the bonding of electrical con acts to the transition me al ilicides is by no means an i superable problem. It is suggested that the silicides will be useful in the range 500 - 800 C probably in cascade with PbTe. On the theoretical side, a b sic understanding of the transition metal silicides or, indeed, any of the transition metal compounds is still lacking. The silicides remain s one of the few stable ma rials at high tempera ur s. Much could be done to optimize the transition metal silicides still further, particularly, along the lines of addition of small quantities of noble metals and the reduction of the lattice component of the thermal conductivity by substitutions of heavy metal silicides. (Aut or)

Descriptors :   *SILICIDES, *SILICON ALLOYS, *SILICON COMPOUNDS, *THERMOELECTRICITY, BONDING, CHROMIUM ALLOYS, COBALT ALLOYS, COBALT COMPOUNDS, CRYSTAL STRUCTURE, ELECTROMAGNETIC PROPERTIES, GERMANIUM ALLOYS, GERMANIUM COMPOUNDS, GROWTH(PHYSIOLOGY), IMPURITIES, INTERMETALLIC COMPOUNDS, IRON ALLOYS, MAGNETIC PROPERTIES, MANGANESE ALLOYS, MATERIALS, PHASE STUDIES, PREPARATION, REFRACTORY MATERIALS, SINGLE CRYSTALS, THERMAL CONDUCTIVITY, THERMAL EXPANSION, TRANSITION METALS

Distribution Statement : APPROVED FOR PUBLIC RELEASE