Thermische und elektrische Leitfähigkeit von Vanadinlegierungen zwischen 20 und 650 °c

Abstract

Measurements were made of the thermal and electrical conductivity of vanadium-titanium arid vanadium -titanium-niobium alloys containing up to 20 wt % titanium or niobium. Both for pure vanadium and for the alloys the thermal conductivity increases with temperature in the range 20–650 °C. The temperature-dependence of the electrical conductivity diminishes with increasing titanium content, while the influence of niobium on the thermal and electrical conductivity is relatively small at 20 °C and becomes even smaller as the temperature rises. The specific electrical resistivity follows an exponential function of increase between 20 and 800 °C; the function is similar for all the alloys investigated. The only alloys which show anomalous behaviour are V/3% Ti and V/3% Ti/15% Nb, the latter to a lesser degree. Apart from the alloy V/3% Ti, the thermal conductivity of all the alloys investigated rises proportionately to the function t/ q. The thermal conductivity can be computed from the electrical resistivity, with sufficient accuracy, over the entire temperature range between 20 and 650 °C. Values of thermal conductivity at higher temperatures can also be computed from values of electrical resistivity measured at 20 °C. With respect to thermal conductivity, these vanadium alloys are superior or at least equivalent to heat-resistant steels and nickel alloys at high temperatures.