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为了探求La系磁熵变材料的短时退火工艺,利用两种方法制备了磁制冷材料La0.8Ce0.2Fe11.4Si1.6合金,其一为将电弧熔炼合金退火5天(样品A),其二为将合金利用铜模铸造方法得到快淬样品,再退火2 h(样品B)。X射线衍射表明,样品A和B主相为NaZn13相结构。通过对比发现,尽管样品A的最大磁熵变值大于样品B的,但样品B在制冷温区和制冷能力方面优于样品A。因此,快淬加短时间热处理可以大大节省时间和能量,是一种制备La0.8Ce0.2Fe11.4Si1.6磁制冷材料的高效且性能优越的方法。
In order to explore the short-time annealing process of La-based magnetic entropy change materials, two methods were used to prepare La0.8Ce0.2Fe11.4Si1.6 magnetic refrigeration material, one of which is to anneal the arc melting alloy for 5 days (sample A) The second is to use the copper alloy casting method to obtain quenched quenched sample, and then annealed 2 h (sample B). X-ray diffraction shows that the main phases of Samples A and B are NaZn13 phase structures. It is found by comparison that sample B is superior to sample A in terms of cooling temperature and cooling capacity, although the maximum magnetic entropy change of sample A is greater than that of sample B. Therefore, quenching and short-time heat treatment can greatly save time and energy, which is an efficient and superior performance method for preparing La0.8Ce0.2Fe11.4Si1.6 magnetic refrigeration material.