A setup for studying thermal characteristics of metals at high temperatures

A setup for studying the radiation characteristics of metals based on calorimetry of metals exposed to electron heating under high-vacuum conditions has been developed. A new design of the cathode-anode unit ensures a uniform distribution of the electron flow over the sample surface. The created decelerating field prevents secondary electrons from leaving the cathode-anode unit. The serviceability of the setup was tested via measurements of the integral hemispherical emissivity of extremely pure titanium (>99.91 mass %). The emissivity changes in the temperature range 1155–1165 K, associated with the restructuring of the crystal lattice from a close-packed hexagonal structure into a body-centered cubic structure, has been revealed.