工质材料GdDyFe磁热效应的研究

Research on Magnetocaloric Effect of GdDyFe Alloy

对于磁制冷GdDyFe铸锭复合材料和快淬得到的纳米晶薄带的结构和磁热效应进行了研究和分析。结果表明,GdDyFe铸锭样品和纳米晶薄带样品的居里温度比GdDy合金高,分别由原来的260K升高到了275K和263K,并保留了较大的磁熵变。而且几种相变温度各不相同的铁磁物质复合的GdDyFe材料及其薄带样品的纳米晶结构使得样品的高磁熵变温区范围宽化。该材料适用于埃里克森循环,为磁制冷材料的实用化带来了希望。

In this article we have researched Magnetocaloric effect of GdDyFe alloy ingot and melt-spun ribbon which possessed high magnetic entropy change and relatively low cost. The samples were prepared in melt casting ingot and melt-spun. The measurements of magnetocaloric effect of GdDyFe alloy has been carried out with an applied magnetic field of 1.2 T in a temperature range of 253 K-293 K The magnetic entropy change of the GdDyFe ingot and melt-spun ribbon were calculated. The phase components were analyzed by X-ray diffraction （XRD） patterns. Compare with the GdDy alloy, the Curie temperature of GdDyFe ingot and ribbon increase from 260 K to 263 K and 275 K, although have a little decrease of magnetic entropy change, they still catch a large A Sin. Meanwhile , the temperature dependence range of high A Sm was broaden by the composite materials and the nanocrystalline, all of these are suitable for the Ericcson cycle.