The spectral emissivity of iron-nickel alloys

H. B. Wahlin, Robert Zentner, James Martin

The spectral emissivity for λ=6700Å has been determined for Fe‐Ni alloys and shows changes with temperature which indicate that in the temperature range of 1200°K to 1600°K abnormal behaviors exist which hitherto have not been suspected. A correlation of emissivity change with change in density of metals is suggested.

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Materials
Curve 1
Wavelength μ: 0.67 Temperature Range, K: 1249-1571 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 50 Fe, 50 Ni; powders were mixed in desired proportions, compressed at 70,000 psi at 298 K, heated at 1373 K in flowing hydrogen; cold rolled then heated in hydrogen at 1273 K.
Curve 2
Wavelength μ: 0.67 Temperature Range, K: 1248-1611 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 56 Fe, 44 Ni; specimen preparation same as curve 1.
Curve 3
Wavelength μ: 0.67 Temperature Range, K: 1271-1597 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 58 Fe, 42 Ni; specimen preparation same as curve 1.
Curve 4
Wavelength μ: 0.67 Temperature Range, K: 1252-1604 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 62 Fe, 38 Ni; specimen preparation same as curve 1.
Curve 5
Wavelength μ: 0.67 Temperature Range, K: 1262-1563 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 75 Fe, 25 Ni; specimen preparation same as curve 1.
Curve 1
Wavelength μ: 0.67 Temperature Range, K: 1249-1571 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 50 Fe, 50 Ni; powders were mixed in desired proportions, compressed at 70,000 psi at 298 K, beated at 1373 K in flowing hydrogen; cold rolled tben heated in hydrogen at 1273 K.
Curve 2
Wavelength μ: 0.67 Temperature Range, K: 1254-1584 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 75 Ni, 25 Fe; specimen preparation same as curve 1.