The emissivity of iron-tungsten and iron-cobalt alloys

Harry W. Knop Jr.

The spectral emissivity at λ=0.667 μ has been determined for an 18 percent W-Fe alloy and a 40 percent Fe-Co alloy. Changes have been detected at the peritectoid and peritectic reaction temperatures for W-Fe and at the A3 point for Fe-Co. Emissivity changes found at 1044°K and 1292°K in Fe-Co are attributed to the order-disorder transition and the ferro to paramagnetic transformation, respectively. The resistivity of 40 percent Fe-Co has been determined as a function of temperature. © 1948 The American Physical Society.

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Materials
Curve 1
Wavelength μ: 0.667 Temperature Range, K: 975-1540 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 60 Co, 40 Fe; measured in hydrogen.
Curve 1
Wavelength μ: 0.667 Temperature Range, K: 1220-1640 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 82 Fe, 18 W; heated to 1375 K; measured in hydrogen; increasing temp.
Curve 2
Wavelength μ: 0.667 Temperature Range, K: 1685-1260 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 82 Fe, 18 W; heated to 1680 K; measured in hydrogen; decreasing temp.