Radiance temperatures (in the wavelength range 523–907 nm) of group IVB transition metals titanium,zirconium, and hafnium at their melting points by a pulse-heating technique |
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Authors: | A Cezairliyan J L McClure A P Miiller |
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Affiliation: | (1) Metallurgy Division, National Institute of Standards and Technology, 20899 Gaithersburg, Maryland, USA;(2) Thermophysics Division, National Institute of Standards and Technology, 20899 Gaithersburg, Maryland, USA |
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Abstract: | The melting-point radiance temperatures (at six wavelengths in the range 523–907 nm) of the Group IVB transition metals titanium, zirconium, and hafnium were measured by a pulse-heating technique. The method is based on rapid resistive self-heating of the specimen from room temperature to its melting point in less than 1 s and on simultaneously measuring the specimen radiance temperatures every 0.5 ms with a high-speed six-wavelength pyrometer. Melting was manifested by a plateau in the radiance temperature-versus-time function for each wavelength. The melting-point radiance temperatures for a given specimen were determined by averaging the measured temperatures along the plateau at each wavelength. The melting-point radiance temperatures for each metal were determined by averaging results for several specimens at each wavelength as follows:
Based on estimates of the random and systematic errors arising from pyrometry and specimen conditions, the combined uncertainty (95% confidence level) in the reported values is about ±8K at each wavelength. |
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Keywords: | semissivity hafnium high-speed pyrometry high-temperature fixed points melting multiwavelength pyrometry radiance temperatures titanium zirconium |
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