Abstract
A solar furnace experimental setup was used to measure melting and freezing temperatures between 2000 and 3000 °C. The solar furnace is coupled to a self-crucible device inside a rotating reactor. Cavities with a depth/aperture ratio of 1.0–1.5 were obtained, with apparent emissivities from 0.87 to 0.98. With the current setup, freezing plateaus lasted a few seconds. Four refractory oxides (HfO 2, Y 2O 3, Al 2O 3, and Ho 2O 3) were studied. Preliminary radiance temperature measurements obtained with two radiation thermometers operating in two different spectral ranges are presented. Typically, the reproducibility of the temperature measurements ranged from 5 to 50 °C, depending on the material and on the spectral range of the radiation thermometer.
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