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News: A pilot plant for Nd-Fe-B rare earth permanent magnets has been established at ARCI, Hyderabad to strengthen self-reliant manufacturing ecosystem.
About Nd-Fe-B (Neodymium-Iron-Boron) Rare Earth Permanent Magnets
- Nd-Fe-B magnets are the strongest permanent magnets that can maintain high magnetic force without external power.
- Made up of: These magnets are made from Neodymium, Iron, and Boron as core elements.
- They also include Cobalt, Dysprosium, and Praseodymium in varying amounts.
- Neodymium provides high magnetic strength, iron provides magnetization, and boron stabilizes the structure.
- Types
- Sintered NdFeB magnets are widely used and have the largest output.
- Bonded NdFeB magnets are low cost, light, and have good shape flexibility.
- Hot-pressed NdFeB magnets achieve similar magnetic properties without heavy rare earth elements.
- Key features
- Extreme magnetic strength: These magnets have very strong magnetic force even in small size.
- High coercivity: These magnets resist demagnetization effectively after being magnetized.
- Temperature sensitivity: Their performance can reduce at high temperatures unless modified.
- Corrosion susceptibility: These magnets require protective coating due to high iron content.
- Applications
- Electric mobility: These magnets are used in high-efficiency motors for electric vehicles.
- Renewable energy: These magnets are used in generators of wind turbines.
- Electronics: These magnets are used in mobile phones, hard drives, and earphones.
- Advanced manufacturing and medical technology: These magnets are used in robotics, automation, and MRI machines.
