Synthesis and magnetic performance of gadolinium powder produced with rotating disk atomization

Abstract

Spherical powder is key for achieving good heat transfer and maintaining low pressure drop for heat transfer fluid in magnetocaloric regenerator. Obtaining relatively large spherical powder of rare earth metals that are extremely sensitive to oxygen is challenging. Comparing to gas atomization and plasma rotating electrode methods, rotating disk atomization (RDA) method is more robust for obtaining a small amount of powder with a short turnaround time, thereby, more suitable for research and development of new magnetocaloric materials. In this work, commercially bulk gadolinium was successfully atomized to produce spherical powder in the targeted 150-250 μm range. The obtained powder exhibited the expected magnetocaloric performance with a maximum change of magnetic entropy of 12.1 J/kg K and a maximum adiabatic temperature change of 12.8 K with an applied magnetic field of 7 T.

Магнитокалорический эффект магнитных наночастиц FeNi, полученных методом электрического взрыва проволоки

“…Задача повышения эффективности теплопередачи между рабочим телом и окружающей средой требует использования магнитных материалов для устройств магнитного охлаждения в различных формах, в том числе и в виде порошков и стабилизированных суспензий на их основе [7][8][9].…”

Centrifugal Atomization of Glass-Forming Alloy Al86Ni8Y4.5La1.5

“…Cooling rates between 10 3 and 10 5 K s −1 can be reached using this method [22], thus providing an appropriate range of cooling rates for the generation of Al-based metallic glasses. However, a review of the literature reveals that although there are several works on the centrifugal atomization process [23][24][25], studies on the production of metallic glasses using this technique are not found in the literature.…”

Magnetocaloric particles of the Laves phase compound HoAl2 prepared by electrode induction melting gas atomization

“…For example, they have high melting points above 1000 • C and high reactivity. In the processes that melt and/or superheat a target material in a crucible, such as the centrifugal atomization method [21][22][23] and the gas atomization process [24,25], these properties may cause the reaction of the target material and the crucible, preventing the mass production of high-quality particles. The plasma rotating electrode process [26,27] can produce high-purity spherical particles by non-contact melting of a material's electrode rod that rotates at high speed.…”