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首页> 外国专利> First-order phase-transition La(Fe,Si)13-based magnetocaloric material showing small hysteresis loss and preparation and use thereof

First-order phase-transition La(Fe,Si)13-based magnetocaloric material showing small hysteresis loss and preparation and use thereof

机译：磁滞损耗小的一阶相变La（Fe，Si） 13 基磁热材料及其制备和应用

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The invention provides a first-order phase-transition La(Fe,Si)13-based magnetocaloric material showing small hysteresis loss, and preparation and use thereof. The material has a NaZn13-type structure, is composed of granules with a particle size in the range of 15˜200 μm and not less than 15 μm, and is represented by chemical formula La1-xRx(Fe1-p-qCopMnq)13-ySiyAα. The method for preparing the material comprises steps of preparing the material La1-xRx(Fe1-p-qCopMnq)13-ySiyAα by smelting and annealing; and then crushing the material into powder with a particle size in the range of 15˜200 μm. Without changing the components, a La(Fe,Si)13-based magnetocaloric material showing small hysteresis loss and strong magnetocaloric effect can be obtained by adjusting the particle size within the range of 15˜200 μm. Utilization of this type of materials in the practical magnetic refrigeration application is of great significance. When the particle size is 10 μm or less, the stability of the magnetocaloric material is lost; the magnitude of magnetic entropy change is reduced dramatically; and thus it is no longer suitable for the practical application in magnetic refrigeration technology. Therefore, the giant magnetocaloric effect of the material can be maintained to the max if the granules with a particle size of less than 10 μm are removed by screening.
机译：本发明提供一种磁滞损耗小的一阶相变La（Fe，Si） 13 基磁热材料及其制备和应用。该材料具有NaZn 13 型结构，由粒径在15〜200μm且不小于15μm的颗粒组成，并由化学式La 表示1-x R x （Fe 1-pq Co p Mn q ） 13-y Si y A α。制备材料的方法包括制备材料La 1-x R x （Fe 1-pq Co p < / Sub> Mn q ） 13-y Si y A α进行熔炼和退火;然后将其粉碎成粒径为15〜200μm的粉末。在不改变成分的情况下，通过将粒径调节在15〜200μm的范围内，可以得到磁滞损耗小，磁热效应强的La（Fe，Si） 13 基磁热材料。这种类型的材料在实际的磁制冷应用中具有重要意义。当粒径为10μm或更小时，磁热材料的稳定性丧失;磁熵变的幅度大大降低;因此不再适合磁性制冷技术的实际应用。因此，如果通过筛选除去粒径小于10μm的颗粒，则材料的巨大的磁热效应可以保持最大。

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