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通过高频悬浮炉反复熔炼,在1 363K纯氩环境下退火144h后淬火,饱和吸氢后得到母合金样品La0.9Ce0.1Fe11.7-xMnxSi1.3Hy(x=0.21,0.25)。对其进行等质量塑性粘结,得到复合物。XRD相图结果表明,母合金的主相均为NaZn13型立方结构(空间点群为Fm-3c)。由热磁曲线和磁熵变曲线可以明显看出,复合物的温变区间与两母合金相比有所增大,并且其熵变值在1.5T磁场下依然比Gd的要高很多,最高约为6.4J/(kg·K)。复合物的相对制冷能力RCP(S)值与两母合金相比略大。
After repeated melting in a high-frequency suspension furnace, annealing was performed in a pure argon atmosphere of 1 363K for 144 hours and then quenched to obtain La0.9Ce0.1Fe11.7-xMnxSi1.3Hy (x = 0.21, 0.25) as the master alloy. Its quality plastic bonding, get complex. XRD phase diagram results show that the main phase of the mother alloy NaZn13 type cubic structure (space point group Fm-3c). From the thermal magnetic curve and the magnetic entropy change curve, it can be clearly seen that the temperature range of the composite increases with that of the two mother alloys, and the entropy change value is still much higher than that of Gd under the 1.5T magnetic field. About 6.4 J / (kg · K). The RCP (S) value of the relative refrigeration capacity of the composite is slightly larger than that of the two mother alloys.