采用真空高频磁悬浮炉制备出LaFe12.2-xCo0.9SixB0.25(x=1.1,1.3,1.5)3组合金样品,并测量其绝热温变,绘制出绝热温变曲线。实验结果表明,通过调节微量元素Si的含量,可以将材料的居里温度调节到合适的值,并保持较好的磁热效应。当Si含量在1.1%时,该合金绝热温变值最大。 LaFe12.2-xCo0.9SixB0.25 (x = 1.1,1.3,1.5) three groups of gold samples were prepared by vacuum high-frequency magnetic levitation furnace. The adiabatic temperature change was measured and the adiabatic temperature change curve was drawn. The experimental results show that by adjusting the content of trace element Si, the Curie temperature of the material can be adjusted to a suitable value and a good magnetocaloric effect can be maintained. When Si content is 1.1%, the adiabatic temperature change value of this alloy is the largest.