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Liquid State Spectral Emissivities of Titanium, Vanadium, Zirconium, Molybdenum, and Platinum in an Electron Beam Furnace.

Koch-RK; Hoffman-JL; Beall-RA
NTIS: PB 221 526 :25 pages
The normal spectral emissivities of liquid ti, V, zr, mo, and pt were determined at the fusion temperatures and were estimated above the melting points by using adjusted two-color temperatures as approximations of the true temperatures for substitution in wien's equation. Simultaneous brightness temperatures were determined with a micro-optical pyrometer. The true temperature ranges covered were 1,668 deg to 1,885 deg c for ti; 1,919 deg to 2,013 deg c for v; 1,855 deg to 2,367 deg c for zr; 2,610 deg to 2,751 deg c for mo, and 1,772 deg to 1,990 deg c for pt. The spectral emissivities for titanium and zirconium decreased with increasing temperature. At an effective wavelength (^) of 658 mu the emissivity of titanium ranged from 0.51 to 0.45 and zirconium, from 0.47 to 0.41. The emissivities of vanadium (^ = 658 mu) and molybdenum (^ = 657 mu) were constant at 0.41 +/- 0.02 and 0.33 +/- 0.01, Respectively. The spectral emissivity of platinum (^ = 658 mu) was constant at 0.39 +/- 0.02 Up to 1,900 deg c; above that temperature anomalous data were obtained. A mass spectrometric study indicated that platinum was reacting with backstreaming silicon vapors from the diffusion pump when the ambient pressure was greater than 2 x 10-5 torr.
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7743
NIOSH Division
Source Name
NTIS: PB 221 526