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A method of measuring high-temperature thermal conductivity of metals

A direct electrical heating method to determine the thermal conductivity of metals at high temperatures has been developed by using a particular geometry of the specimen such that the non-linearity due to radiation losses in the differential equation of heat flow can be eliminated. The geometrical form of a specimen is deduced theoretically such that direct electrical heating produces a uniform temperature gradient along its length. This optimum form can be approximated to a sector of a circle with radial flow of current. The differential equation of heat flow then does not have to be integrated and the thermal conductivity at any temperature can be calculated irrespective of the temperature variation of the resistivity and emissivity of the material. The method has been verified by determining the thermal conductivity of nickel at high temperatures.