【摘要】 研究了三种不同工艺制备过程对巨磁热材料Mn1.25Fe0.65P0.50Si0.50化合物的结构、力学及磁热性能的影响。XRD结果表明，两种工艺样品的晶体结构均为Fe2P型六角结构，空间群为P-62m。磁性结果及分析表明，热压烧结样品的磁性和磁热效应降低，但其相对制冷能力得到提升。热压烧结技术样品内部更加致密，力学性能显著提升，最大抗压强度和应变分别提升了约557%和167%。更多还原

【Abstract】 Mn1.25Fe0.65P0.50Si0.5compounds were fabricated by three different processes. The effects of different processes on the structure, mechanics and magnetocaloric properties of Mn1.25Fe0.65P0.50Si0.5compounds were investigated. XRD and magnetic results indicate that all the samples crystalize in Fe2P-type hexagonal structure with space group of P-62m and show almost the same size of thermal hysteresis. Hot-pressing sintering slightly increases Curie temperature of the sample due to its argon flowing atmosphere. Hot-pressing sintering sample shows lower maximum magnetic entropy change,but higher relative cooling capacity, which is due to the broadening of magnetic transition. Due to the increased compactness of the hot-pressing sintered sample, its mechanical properties significantly improved, the maximum compressive strength and strain are increased by 557% and the 167% respectively, compared with the conventional solid-state sintered one.更多还原