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|Title:||New Techniques for High-temperature Melting Measurements in Volatile Refractory Materials via Laser Surface Heating|
|Authors:||MANARA Dario; SHEINDLIN M.; HEINZ Wilhelm; RONCHI C.|
|Citation:||REVIEW OF SCIENTIFIC INSTRUMENTS vol. 79 p. 113901|
|Publisher:||AMER INST PHYSICS|
|Type:||Articles in periodicals and books|
|Abstract:||An original technique for the measurement of high-temperature phase transitions was implemented based on a laser-heating method, enabling chemically unstable, refractory materials to be melted under controlled conditions. This technique includes two independent but correlated methods: In the first, fast multichannel pyrometry is employed to measure thermograms and spectral emissivity; in the second, a low-power probe laser beam is used for the detection of reflectivity changes induced by phase transitions on the sample surface. The experiments are carried out under medium 102 kPa or high 102 MPa inert-gas pressures in order to kinetically suppress evaporation in volatile or chemically instable samples. Two models for the simulation of the laser-heating pulses are as well introduced. Some results are presented about the successful application of this technique to the study of the melting behavior of oxides such as UO2+x, ZrO2, and their mixed oxides. The method can be extended to a broad class of refractory materials.|
|JRC Institute:||Nuclear Safety and Security|
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