Zn-doped mn-fe-p-si based magnetic refrigeration material and preparation method thereof
A mn-fe-p-si, magnetic refrigeration material technology, applied in the direction of refrigerators, refrigeration and liquefaction, machine operation, etc., can solve the adverse effects of magnetocaloric effects, weaken the mixed magnetic properties of materials and other problems, and achieve the optimization of magnetocaloric effects , optimize the Curie temperature, reduce the effect of thermal hysteresis
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Embodiment 1
[0022] (1) Put manganese flakes, iron powder, phosphorus block, silicon block, zinc powder into MnFe 0.90 P 0.6 Si 0.4 Zn 0.05 (x=0.05) The molar ratio of each element in the chemical formula is weighed, and put into a stainless steel ball mill jar for ball milling under the protection of an argon atmosphere. The ball milling process conditions are: the mass ratio of steel balls to raw materials is 6:1, the ball milling time is 10 hours, and the frequency is 30 Hz.
[0023] (2) Put the ball-milled powder into a mold with a diameter of 10mm, and press it into a disc-shaped sample of φ10*5mm under a pressure of 750MPa, and the pressing time is 5min.
[0024] (3) Seal the pressed sample into a quartz tube filled with argon protection, sinter at 1100°C for 20 hours, and then quench in cold water to obtain the sample.
Embodiment 2
[0026] Prepared by a method similar to that of Example 1, except that the molar ratio among Mn, Fe, P, Si, and Zn is changed to 1:0.85:0.6:0.4:0.1, that is, x=0.1, the rest are the same.
Embodiment 3
[0028] Prepared by a method similar to that of Example 1, except that the molar ratio among Mn, Fe, P, Si, and Zn is changed to 1:0.75:0.6:0.4:0.2, that is, x=0.2, the rest are the same.
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