Abstract
Emissivity is one of the most important parameters in high-temperature technology. Reference data on this question is presented in an incomplete and contradictory manner [I]. Below we provide the results obtained in studying emissivity of thermoelectrode specimens and certain other materials tested in the form of wire or small-diameter tubes. The basic method consisted of comparing the thermal emission of bodies with different emissivities [i]. Platinum and platinorhodium in the form of 0.5-mm-diameter wire were selected as materials with a known and thoroughly investigated emissivity [i, 2]. However, the relationship of emissivity to temperature obtained for these materials by different authors differs considerably, owing to different techniques, experimental precision, chemical composition, and manufacturing technology of materials, as well as the condition of their surfaces. Therefore, we investigated the emissivity of specific platinum and platinorhodium wire specimens which were placed in a vacuum container with a residual pressure not exceeding 10"6-10 -7 mmHg. Their emissivity was calculated from the formula
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