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
A. Cezairliyan et al., 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, International journal of thermophysics, 15(5), 1994, pp. 993-1009
The melting-point radiance temperatures (at six wavelengths in the ran
ge 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 tempe
rature to its melting point in less than Is and on simultaneously meas
uring the specimen radiance temperatures every 0.5 ms with a high-spee
d six-wavelength pyrometer. Melting was manifested by a plateau in the
radiance temperature-versus-time function for each wavelength. The me
lting-point radiance temperatures For a given specimen were determined
by averaging the measured temperatures along the plateau at each wave
length. The melting-point radiance temperatures for each metal were de
termined by averaging results for several specimens at each wavelength
as follows: [GRAPHICS] Based oh estimates of the random and systemati
c errors arising from pyrometry and specimen conditions, the combined
uncertainty (95% confidence level) in the reported values is about +/-
8 K at each wavelength.