| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing Nd2Fe14B phase powder composed of Nd2Fe14B crystal grains of <=50 nm, and in which the size of the powder is <=1 μm. SOLUTION: This method includes a stage in which a mixed aqueous solution composed of Nd metallic salt, Fe metallic salt and boron acid is spray-dried to produce initial powder mixed with Nd, Fe and B elements, a stage in which the above powder is desalted to produce oxide multiple powder, a stage in which the multiple oxide powder is subjected to reduction treatment to produce multiple powder composed of Nd oxide and α-Fe and to meal the same, a stage in which CaO is added and mixed into the above mealed multiple powder to produce a powdery mixture of an Nd2Fe14B phase/a CaO phase and a stage in which the above powdery mixture is cleaned with water to remove CaO and is dried. |
