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研究了稀土金属Gd的纯度对Gd52.5Co18.5Al29非晶合金的玻璃形成能力和磁热效应的影响。研究表明Gd的纯度从99.94%下降到99.2%,非晶合金的临界直径从4mm减小到3mm;磁热效应并未随纯度降低而下降,采用高纯和低纯金属Gd制备的Gd52.5Co18.5Al29非晶合金的最大磁熵变和相对制冷量分别为9.4J·kg-1·K-1,8.1×102J·kg-1和9.5J·kg-1·K-1,8.4×102J·kg-1。因此,采用商业低纯Gd制备的Gd-基非晶合金适合作为磁致冷候选工质。
The effect of the purity of rare earth metal Gd on the glass forming ability and magnetocaloric effect of Gd52.5Co18.5Al29 amorphous alloy was studied. The results showed that the purity of Gd decreased from 99.94% to 99.2%, the critical diameter of amorphous alloy decreased from 4mm to 3mm, and the magnetocaloric effect did not decrease with the decrease of purity. Gd52.5Co18 prepared from high purity and low purity metal Gd was used. The maximum magnetic entropy change and relative cooling capacity of 5Al29 amorphous alloy are 9.4J · kg-1 · K-1,8.1 × 102J · kg-1 and 9.5J · kg-1 · K-1,8.4 × 102J · kg -1. Therefore, Gd-based amorphous alloys prepared using commercial low purity Gd are suitable as magnetic refrigeration candidates.