Abstract
Spark plasma sintering (SPS) is an effective method for synthesizing the Fe2P-type alloys due to its fast heating rate and short sintering time. Raw materials in the form of powder are sintered and pressed simultaneously in the preparation. Therefore, the particle size of the powder would have important influences on the structural and magnetic properties of the Fe2P-type alloys. In this work, the structure and magnetic properties of Mn1.25Fe0.7P0.5Si0.5 alloys prepared by SPS using raw materials milled with different lengths of time were investigated. We found that the particle size of the raw materials reduced mainly within milling time of 5 h and only slight difference existed when the milling time exceeded 5 h. Obvious secondary phase of (Mn,Fe)3Si was observed in the alloy prepared with milling time of 1 h. Other alloys prepared with milling time of 2 h, 5 h and 10 h showed similar magnetic properties. Giant isothermal entropy change values of 7.4 ∼ 9.6 J ⋅ kg−1 ⋅ K−1 for a magnetic field change of 1.5 T were obtained near room temperature for the alloys. The results demonstrate that a milling time longer than 2 h is required to obtain such magnetocaloric Mn-Fe-P-Si alloys with excellent magnetic properties using SPS method and the obtained alloys are promising candidates for magnetic refrigeration near room temperature.
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