REVERSIBLE INVERSE MAGNETOCALORIC HEUSLER ALLOY AND MANUFACTURING METHOD THEREOF

摘要

The present invention relates to a reversible inverse magnetocaloric Heusler alloy and a manufacturing method thereof, and more specifically, to a Ni-Mn Heusler alloy, which is capable of controlling the operating temperature of inverse magnetocaloric effects by substituting a small quantity of 3d transition metal; showing a great magnetic entropy change (SM); and displaying a great, sustainable inverse magnetocaloric effect within a broad temperature range through a small thermal-hysteresis behavior under 20 K, and a manufacturing method thereof. That is, the present invention is based on a composition of Ni45Co5Mn40Sn10, which has a high susceptibility and a small thermal-hysteresis; substitutes Ti, V, and Cr, which are 3d transition metals, for Ni by considering the e/a ratio; reduces the density of the peripheral electrons; and systematically controls the phase change temperature in accordance with the added volume within a broad temperature range (5 K-400 K) under the room temperature. In addition, the present invention maintains a great magnetic entropy change (SM) and a thermal-hysteresis of under 20 K even when an added element is included; causes a great temperature difference while having a small driving force of martensitic transformation; and makes a certain volume of great, sustainable reversible inverse magnetocaloric effect even under a repeated magnetic cycle. The alloy manufactured by the present invention is directly applicable to a magnetic cooling machine, which will be designed from here on, as an energy exchange medium, and is available for developing new magnetocaloric materials and controlling their characteristics by applying the designing and manufacturing method of the alloy of the present invention.;COPYRIGHT KIPO 2017