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

The melting point radiance temperatures (at six wavelengths in the range 523-907 nm) of the Group IVB transition metals Ti, Zr and Hf 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 < 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 temperture vs. 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.