Customized NdFeB Magnet

NdFeB magnet is a rare earth permanent magnet made from an alloy of Neodymium, Iron and Boron with the Nd2Fe14B tetragonal crystalline structure. It is one of the strongest magnetic materials available and has a wide range of applications in industry. The NdFeB magnetic alloy is the most popular and widely-used type of rare earth magnet.

NdFeB is used in a variety of industries such as power-window motors, CNC machine tool servo motors, elevator motors, wind turbines and more. Its high strength and versatility make it a good choice for applications that require large-scale magnet assemblies, but which do not need to operate at extreme temperatures.

Sizes & Shapes

NdFeB permanent magnets are available in standard discs, blocks and rings in several grades of thickness. They are also available in non-standard shapes, and can be custom fabricated from raw stock to meet your design requirements.

Processes

During the NdFeB manufacturing process, magnetic powder is mixed with an alloy binder and heated to a specified temperature. Once the powder has reached the desired temperature, it is sintered (heated until the powder is hard and dry). The resulting product is then cooled rapidly in order to improve its hardness and strength.

Injection Molding, Extrusion and Calendering

Depending on the application, NdFeB magnets can be produced using various processes, including injection molding, extrusion, calendering or compression bonding. These processes can be used to manufacture NdFeB magnets that have a smooth or textured surface, or are otherwise complex or unusual in shape.

Injection Molding is the most common process for producing NdFeB magnets, but some manufacturers use other methods as well. The price of NdFeB magnets varies greatly between manufacturers and is dependent on the type of process used for production, the quality of the raw material and the degree of customization required by the customer.

Sintered NdFeB Magnets

The production of sintered NdFeB magnets can be divided into three stages: grinding and sintering, quenching and tempering. In the sintering stage, the NdFeB magnetic powder is combined with a binder and heated to a temperature varying from 600°C to 800°C. Once the magnets have cooled to their proper temperature, they can be bonded together or cut into shape with diamond plated cutting tools.

Sintered NdFeB magnets are difficult to remove from steel plates because of the generated magnetic field and the glue that is used to set the magnets in place. Several experiments have been conducted to determine if it is possible to selectively leach NdFeB magnets from the steel plates.

Leaching of NdFeB magnets from HDDs with Hydrochloric Acid

This study is an experimental investigation into the ability to selectively leach NdFeB permanent magnets from the surfaces of hard disk drives by contacting them with a solution of hydrochloric acid at room temperature. The leaching reaction progressed at a rate determined by the concentration of nickel ions in the solution.

The results showed that the iron and neodymium ions in the solution were removed, whereas the nickel layer was preserved. This suggests that NdFeB magnets could be effectively and selectively leached from the HDD surfaces without affecting other important components. This could help reduce the environmental impact of disposing of end-of-life magnetic materials.