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

US10049797B2 · kind B2 · utility

Assignee

• CENTRAL IRON AND STEEL RESEARCH INSTITUTE · CN

Inventors

• Minggang Zhu · Beijing, CN
• Jingdai Wang · Zhejiang, CN
• Wei Li · 东风镇, CN
• Haibo Feng · Beijing, CN
• Yikun Fang · Beijing, CN
• Yanfeng Li · Beijing, CN
• Mingge Zhou · Beijing, CN
• Xuchao WANG · Shanghai, CN
• Shulin Huang · Beijing, CN

Key dates

• Filing date: Dec 12, 2012
• Grant date: Aug 14, 2018
• Expiry date: Dec 19, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F41/0273
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

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)100-x(Ce100-yLay)x]aFe100-a-b-cBbTMc, wherein x, y, a, b and c represent mass percents of corresponding elements respectively, 0≤x≤40%, 0≤y≤15%, 29≤a≤30%, 0.5≤b≤5%, 0.5≤c≤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° C. and the annealing temperature is 450-550° C. The magnetic energy product (BH)m is more than 40 MGOe; and the coercive force Hcj is more than 10 kOe. The production time and …