高温環境下におけるクロムとパラジウムの表面の熱ふく射現象(熱工学,内燃機関,動力など)

概要

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For the purpose of thermal engineering applications, we investigate thermal radiation phenomena of surfaces of chromium and palladium in a high-temperature air-oxidation process on the basis of simultaneous measurement of spectra of normal incidence hemispherical reflectance and normal emittance in a near-ultraviolet through infrared region. As the results of the spectral measurement, clear radiation interference is observed even in the spectra of hemispherical reflectance of a rough-finished chromium surface in the oxidation process as well as in the spectra of normal reflectance of a specular-finished surface. Relation between the chemical reactions of oxidation and reduction of a palladium surface at the 1000〜1100K range and the radiation characteristics, is analyzed on the temperature hysteresis of radiation spectra and the reaction rates of oxidation and reduction. A switching function of radiation characteristics of palladium accompanied by the oxidation and reduction reactions is suggested to be respectable for engineering applications.
2010-08-25