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用高频悬浮炉制备了La_(0.9)Ce_(0.1)Fe_(11.7-x)Mn_xSi_(1.3)系列合金,在1363 K下退火144 h,退火后的样品在温度为593 K、压力为0.03 MPa的氢气氛围中饱和吸氢。吸氢后的样品磨成粉末,采用粉末粘结的方法制备成块状磁工质。采用XRD及SEM分析了样品的组织结构,观察样品的表面形貌,并用VSM测试样品的磁性能。实验结果表明,随着Mn含量的增加,氢化物的居里温度降低,材料的居里温度在室温范围内连续可调,同时磁热效应有所降低;粘结后的样品具有较大磁热效应,力学性能良好。
The La_ (0.9) Ce_ (0.1) Fe_ (11.7-x) Mn_xSi_ (1.3) alloy was prepared by high frequency suspension furnace and annealed at 1363 K for 144 h. The samples annealed at 593 K and pressure of 0.03 MPa Saturated hydrogen in the hydrogen atmosphere. Hydrogen absorption of the sample after grinding into powder, the use of powder bonded to prepare a block of magnetic material. The structure of the sample was analyzed by XRD and SEM. The surface morphology of the sample was observed. The magnetic properties of the sample were measured by VSM. The experimental results show that with the increase of Mn content, the Curie temperature of the hydride decreases, the Curie temperature of the material is continuously adjustable at room temperature, and the magnetocaloric effect is reduced at the same time; the bonded sample has a larger magnetocaloric effect, Good mechanical properties.