Several factors have to be considered when specific properties are desired in a high temperature wire. These include 1 Conductivity 2 Temperature coefficient of resistivity 3 Oxidation resistance and resistance to other corrosive media 4 Tensile strength at room and elevated temperatures 5 Thickness of protective coating. Many times a specific property can only be attained at the sacrifice of one or more other properties. Therefore, to design a composite, the desirable characteristics must be clearly spelled out, and the best possible compromise between all the factors has to be determined--first, by calculation, and secondly, by long and tedious testing. In general, a compromise can usually be made and the optimum conductor developed.
Prepared for presentation at the Annual Wire and Cable Symposium on Technical Progress in Communication Wires and Cables (7th), Asbury Park, NJ. 2-4 Dec 1968.