The Experimental Investigation into the Emissivity of Armco A3, Steel 304 and Steel 201
XU Kai-pin1, YU Kun1*, ZHANG Kai-hua1, LIU Yu-fang1, 2*
1. College of Physics & Electronic Engineering, Henan Normal University，Xinxiang 453007, China
2. School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
Abstract：With the rapid development of science and technology, infrared measurement technology has gained an important application potential in remote sensing, radiation temperature measurement, infrared stealth, agriculture, medical science and other fields. In many patterns of radiation measurement, the emissivity of the material is always one of the most important parameters to determine the level of measurement accuracy. In order to meet the demand of the emissivity data for the measurement technology, the spectral emissivities of A3 iron, 304 steel and 201 steel at different temperatures are measured accurately by using a self-developed spectral emissivity measurement device, and several important factors influencing the emissivity of the three materials are explored. The results show that the emissivity of the three materials increases with the increase in temperature, and the emissivity of A3 iron is higher than the values of 304 steel and 201 steel, which were measured under the same conditions. What’s more, the chromium content in the material will reduce the emissivity value. XRD is used to analyze the oxidized components of the three materials, and the influence of surface composition on the emissivity is discussed. The results show that the oxide of A3 iron is composed of Fe3O4 and FeO, and the mutual changes of the various components will lead to the change of the spectral emissivity. The oxide of 304 steel and 201 steel consist mainly chromium oxide, thus their spectral emissivities are relatively stable. In addition, the emissivity of the three kinds of material achieves the maximum at the vicinity of 10 μm, and this phenomenon has been successfully explained by the superposition of two kinds of radiation and the Christiansen effect. This paper greatly enriches the spectral emissivity data of the three materials and provides strong data support for the application of radiation measurement technology in the three kinds of material.
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