磁性稀土材料在VM制冷机中的应用

Rare Earth Magnetic Material Applied to the VM Cryocooler

介绍用液氮作中间冷却剂产生１０Ｋ低温的ＶＭ制冷机，介绍了磁性回热材料的选择以及磁性稀土材料在制冷机中的应用与发展，在回热器中用低温下比热值较大的磁性稀土材料Ｅｒ（Ｎｉ＿０．７９Ｃｏ＿０．２１）＿２部分代替铅丸进行试验，无负荷温度降低，在２０Ｋ时测得制冷量增加，证明了回热器的效率有所提高。

The paper gives an introduction to VM cryocooler operated at the temperature cf 10K which uses the liquid nitrogen as a cryogen,The selection,application and development of the rare earth magnetic regenera-tor material are introduced,Through the experiments,it is clearly shown that no load temperature decreases and the refrigeration capacity measured in 20K increases as lead globe is partly substituted by the highspecific heat rare earth magnetic material Er(Ni0·79Co0·21)2.It proves that the efficiency of regenerator increases.