The Spectral Emissivity of Iron and Cobalt
H. B. Wahlin, Harry W. Knop Jr.
The spectral emissivity of iron and cobalt has been determined as a function of the temperature. Sharp, definite changes in the emissivity have been observed in iron at the A3 and A4 point and at the Curie temperature for cobalt. A gradual change takes place in cobalt in the region where, presumably, the cobalt structure changes from hexagonal to cubic. A decrease in the neighborhood of 1370 K has been observed for iron.
Materials
Curve 1
Wavelength μ: 0.667
Temperature Range, K: 1204-1450
Geometry θ': ~0°
Composition (weight percent), Specifications and Remarks: Prepared electrolytically from a chloride bath; measured in vacuum.
Curve 1
Wavelength μ: 0.667
Temperature Range, K: 1210-1366
Geometry θ': ~0°
Composition (weight percent), Specifications and Remarks: 65 Co, 35 Ni.