Abstract
LaFe11.65Si1.35/Cu core-shell powders were achieved by self-designed magnetron sputtering system, which presents a better solidification during spark plasma sintering in comparison to the naked LaFe11.65Si1.35 powders. Much higher compressive strength, lower corrosion current density and magnetic hysteresis losses are achieved for the sintered sample of LaFe11.65Si1.35/Cu core-shell powders without significant decrease of the magnetic entropy change. The compressive strength, corrosion current density and maximum magnetic hysteresis losses are 105.6 MPa/16.8 MPa, 1.08 × 10−3A/cm2/3.03 × 10−3 A/cm2 and 1.33 J/kg/2.71 J/kg, respectively for the sintered samples of core-shell structured/naked powders. The technique of fabricating the core-shell structured powders demonstrated here is also applicable for other types of functional powders.
Highlights
The compounds LaFe13−xMx (M=Al, Si) with cubic NaZn13-type structure are well known as the applications for magnetic refrigeration, which exhibits a first-order phase transition and a field-induced itinerant electron metamagnetic (IEM) transition, accompanied with changes of lattice volume and magnetization.[1,2,3] Simultaneously, the intrinsic brittleness of the compounds LaFe13−xMx (M=Al, Si) brings up the difficulties of the materials shaping and machining
LaFe11.65Si1.35/Cu core-shell powders were achieved by self-designed magnetron sputtering system, which presents a better solidification during spark plasma sintering in comparison to the naked LaFe11.65Si1.35 powders
A very clear contour of Cu is shown in Fig. 1(d), which indicates that Cu was fully coated on the surface of powders
Summary
The compounds LaFe13−xMx (M=Al, Si) with cubic NaZn13-type structure are well known as the applications for magnetic refrigeration, which exhibits a first-order phase transition and a field-induced itinerant electron metamagnetic (IEM) transition, accompanied with changes of lattice volume and magnetization.[1,2,3] Simultaneously, the intrinsic brittleness of the compounds LaFe13−xMx (M=Al, Si) brings up the difficulties of the materials shaping and machining. Improving the structural stability and decreasing the thermal and magnetic hysteresis loss have been becoming the key issues concerning the practical applications of LaFe13−xMx (M=Al, Si) based compounds
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