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主动式磁蓄冷器中的制冷材料需要满足优良的机械性能、磁热性能和导热性能。然而,目前大多数磁制冷材料在成形和导热性能方面存在着一些问题。在本研究中,介绍了一种在430 K的温度下,将LaFe_(11.6)Si_(1.4)H_(1.02)和铟粉混合后在不同压力下进行压制成形的方法。结果显示,当压制压力超过200 MPa时,复合磁工质的磁热性能将会大幅度降低。在压制压力为100 MPa时,厚度为0.8 mm的片状磁工质在0~2 T的磁场下,达到的最大绝热温变为5.88 K。
Refrigerant materials in active magnetic regenerators need to meet excellent mechanical, magnetocaloric and thermal conductivities. However, at present, most magnetic refrigeration materials have some problems in forming and thermal conductivity. In this study, a method of forming LaFe_ (11.6) Si_ (1.4) H_ (1.02) with indium powder at 430 K and pressing at different pressures was introduced. The results show that when the compression pressure exceeds 200 MPa, the magnetocaloric properties of the composite magnetic material will be greatly reduced. When the compressive pressure is 100 MPa, the maximum adiabatic temperature reached at the magnetic field of 0 ~ 2 T of the sheet-like magnetic material with a thickness of 0.8 mm becomes 5.88 K.