为了提高稀土合金的性能,控制其不纯物是重要课题,在使用金属钙的还原扩散法中,钙便成为不可避免的杂质成分,而控制钙的含量就是今后的重要研究课题。为此研究了钙还原法制取各种稀土合金粉末时残存钙的存在形态,结果简述如下:(1)过剩金属钙及副产物氧化钙被完全除去后的合金粉 In order to improve the properties of rare earth alloys, it is an important issue to control their impurities. In the reduction diffusion method using metallic calcium, calcium becomes an unavoidable impurity component. Controlling the content of calcium is an important research topic in the future. For this reason, the existing forms of residual calcium in the preparation of various rare earth alloy powders by calcium reduction were studied. The results are summarized as follows: (1) excess calcium and by-product calcium oxide are completely removed