Characterization of Commercially Pure Ti Powders Prepared by Cryogenic Milling

Kozlík, Jiří; Stráský, Josef; Harcuba, Petr; Ibragimov, I. É.; Janeček, Miloš

doi:10.12693/aphyspola.134.783

Cited by 1 publication

(1 citation statement)

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“…The temperature experienced by the powder during milling can also determine the nature of the final powder product. It was demonstrated that at low temperatures the dynamic recrystallization and grain growth are suppressed, thus the enhancement of grain refinement leads to an ultra-fine-grained microstructure within each powder particle [33][34][35][36][37][38][39][40]. An empirical explanation of the development of nanostructures is reported by Witkin [35]: during continued milling the increasing of dislocation density is followed by annihilation and recombination of dislocation with the formation of nanometer-scale sub-grains.…”

Section: Introductionmentioning

confidence: 99%

Cryomilling of Isotope-Enriched Ti Powders for HIVIPP Deposition to Manufacture Targets for Nuclear Cross Section Measurement

et al. 2023

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The realization of isotopically enriched Ti targets for nuclear cross-section measurements requires particular attention, from the starting material preparation up to the deposition technique. In this work, a cryomilling process was developed and optimized, aimed at reducing the size of 49,50Ti metal sponge as provided by the supplier (size up to 3 mm), to the optimal size of 10 µm, to fit the High Energy Vibrational Powder Plating technique used for target manufacturing. The optimization of the cryomilling protocol and the HIVIPP deposition using natTi material was thus performed. The scarce amount of the enriched material to be treated (about 150 mg), the need to obtain a non-contaminated final powder and a uniform target thickness of about 500 µg/cm2 were taken into account. The 49,50Ti materials were then processed and 20 targets of each isotope were manufactured. Both powders and the final Ti targets produced were characterized by SEM-EDS analysis. The amount of Ti deposited was measured by weighing, indicating reproducible and homogeneous targets, with an areal density of 468 ± 110 µg/cm2 for 49Ti (n = 20) and 638 ± 200 µg/cm2 for 50Ti (n = 20). The uniformity of the deposited layer was also confirmed by the metallurgical interface analysis. The final targets were used for the cross section measurements of the 49Ti(p,x)47Sc and 50Ti(p,x)47Sc nuclear reaction routes aimed at the production of the theranostic radionuclide 47Sc.

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