Publicado 18 números por año
ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561
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NORMAL EMISSIVITY MODEL OF NICKEL-COBALT ALLOYS AT AN ELEVATED TEMPERATURE IN AIR AND AT 1.5 μm
SINOPSIS
Normal emissivity of nickel-cobalt alloys was measured at temperatures from 800 to 1100 K and at 1.5 μm. When we measured the emissivity, nickel-cobalt specimens were heated to a given temperature and then maintained at that temperature for at least 6 h. To obtain the normal emissivity varying with the thickness of oxidation film at a definite temperature as accurately as possible, the temperature of nickel-cobalt specimens was determined by two thermocouples. The two thermocouples were symmetrically welded onto the front surface of nickel-cobalt specimens. Eleven analytical functions were employed to evaluate the normal emissivity of nickel-cobalt alloys varying with temperature at a definite heating time and its normal emissivity varying with heating time at a given temperature. The influence of the total number of variables in the emissivity analytical models on the fitting quality was investigated. As a conclusion, the fitting quality of normal emissivity could be improved generally by adding the variables to the analytical functions. As a whole, almost all analytical models with four variables can reproduce well the experimental results, whether for a definite heating time or temperature, whereas the analytical models with five variables can reproduce better the measurements. A strong oscillation of emissivity at each temperature was observed. It can be explained by the effect of interference between two optical radiations: one radiation is from the oxide film of specimens; the other coming from the substrate of samples.
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