Central Iron and Steel Research Institute

Minggang Zhu

Wei Li

Yanfeng Li

Jingdai Wang

Haibo Feng

Shulin Huang

Anhua Li

Xuchao Wang

Yachao Sun

Yikun Fang

Mingge Zhou

The invention discloses a low-neodymium, non-heavy-rare-earth and high-performance magnet and its preparing method, and belongs to technical field of rare earth permanent magnetic material. The magnet has a chemical formula of [(Nd, Pr)(CeLa)]FeBTM, wherein x, y, a, b and c represent mass percents of corresponding elements respectively, 0&#x2264;x&#x2264;40%, 0&#x2264;y&#x2264;15%, 29&#x2264;a&#x2264;30%, 0.5&#x2264;b&#x2264;5%, 0.5&#x2264;c&#x2264;5%; and TM is one or more selected from Ga, Co, Cu, Nb and Al elements. A series of grades of magnets can be prepared with rapidly solidified strips of only three components. Component proportioning of magnet can also be directly performed by using mixed rare earth, so that the cost increased by further separation and purification of the rare earth is reduced. During the preparation of magnetic powder with a jet mill, an antioxidant lubricant which is composed of alcohol, gasoline and basic synthetic oil is added. A low-temperature sintering technology is adopted; and the sintering temperature is 1,010-1,050&#xb0; C. and the annealing temperature is 450-550&#xb0; C. The magnetic energy product (BH)is more than 40 MGOe; and the coercive force His more than 10 kOe. The production time and the energy loss can be significantly reduced.

Low-neodymium, non-heavy-rare-earth and high performance magnet

The invention discloses a low-cost double-main-phase Ce permanent magnet alloy and its preparation method, and belongs to technical field of rare earth permanent magnet material. The Ce permanent magnet alloy has a chemical formula of (Ce,Re)FeBTMin mass percent, wherein 0.4&#x2266;x&#x2266;0.8, 29&#x2266;a&#x2266;33, 0.8&#x2266;b&#x2266;1.5, 0.5&#x2266;c&#x2266;2, Re is one or more selected from Nd, Pr, Dy, Tb and Ho elements, and TM is one or more selected from Ga, Co, Cu, Nb and Al elements; the Ce permanent magnet alloy has a double-main-phase structure with a low Hphase in (Ce,Re)&#x2014;Fe&#x2014;B and a high Hphase in Nd&#x2014;Fe&#x2014;B. The double-main-phase Ce permanent magnet alloy of the present invention prepared by using a double-main-phase alloy method greatly lowers the production cost of magnet while maintaining excellent magnetic performances.

Low-cost double-main-phase Ce permanent magnet alloy and its preparation method

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Beijing, China

Minggang Zhu