Study of production process of refined rare-earth alloys and addition alloys

Abstract

The status of Chinese permanent magnet industry and R&D activities AIP Advances 7, 056237 (2017) Abstract. Rare-earth permanent Nd-Fe-B-based magnets are the most promising ones because they have the highest magnetic and operating characteristics. These magnets are produced from alloys having the respective chemical composition with the help of the powder metallurgy technology. One of the methods of magnetic alloys synthesis is fluoride technology which includes the following basic stages: fluorination of raw materials (oxides, metal concentrates, waste products of magnetic or other productions) by means of elemental fluorine or other fluorinating agent, calciumthermal out-of-furnace fluoride reduction with the production of compact ingots of alloys and foundry alloys (magnetic materials) of the desired composition and the production of magnets with the help of the technology mentioned above. The paper presents the results of study of the magnetic alloys production with the help of fusion of individual components. The research results of the refinement of magnetic materials obtained by the out-of-furnace reduction by means of their induction refining are presented. Modification of magnetic materials with the help of nano-dispersed powders of refractory compounds during induction refining is also considered. This allows producing materials of higher quality for the production of high-energy permanent magnets (HEPM).