Armco Iron Normal Spectral Emissivity Measurements

Abstract

Directional spectral emissivity data in different environments are needed in a great number of scientific and technological applications. In this work, the normal spectral emissivity of Armco iron is studied as a function of temperature under a controlled atmosphere. Emissivity values are calculated by the direct radiometric method. The evolution with thermal cycling, the dependence on temperature, and the effect of surface roughness are considered. Additionally, the electrical resistivity is calculated by using the Hagen-Rubens emissivity relation. This work makes progress in the use of Armco iron as an emissivity reference.

First spectral emissivity study of a solar selective coating in the 150–600°C temperature range

“…6 shows the normal spectral emissivity during the oxidation process of the substrate at 600 1C for oxidation times up to 22 h. As expected, the emissivity increase with the oxidation time. In addition, it can be observed the first interferential maximum and minimum associated to the growth of the oxide layer for t410 h [22]. The emissivity behaviour of this steel is similar to other metals [22].…”

Normal spectral emittance of Inconel 718 aeronautical alloy coated with yttria stabilized zirconia films

“…4. Emissivity evolution with the temperature has already been observed in metallic samples in previous studies [22][23][24]. As suggested in Ref.…”

“…3 is observed for short wavelengths. Dependence of the emissivity with the thermal history was already observed in other metals and alloys [22][23][24]. …”

Numerical modeling and characterization of the laser–matter interaction during high-power continuous wave laser perforation of thin metal plates

“…For a smooth iron or steel surface, the average normal emissivity in the bolometer's spectral range is 0.2 at room temperature and gradually increases with temperature up to 0.95 due to the growth of an oxide layer. 8,14,[24][25][26][27] A steep drop in the emissivity after the solidliquid phase transition 14,22 of the material therefore corresponds to a decrease of the measured bolometer temperature T BM . This allows the extraction of the melt time t M , the time at which the melt front reaches the back side of the plate.…”