NdFeB block magnets, made from neodymium, iron, and boron, are widely used in electronics, motors, and magnetic assemblies due to their high magnetic strength and compact size. The manufacturing process involves multiple stages that combine material preparation, pressing, sintering, and finishing to produce stable and reliable magnets.

Material Preparation

The first step is selecting and preparing raw materials. Neodymium, iron, and boron powders are carefully measured and mixed to form a uniform alloy. Sometimes additional elements such as dysprosium or cobalt are added to improve thermal stability or corrosion resistance. The mixture is then milled to create fine powders suitable for pressing.

Pressing and Shaping

The powder is compacted into block shapes using a uniaxial or isostatic pressing method. In this step, the powder is aligned in a magnetic field to enhance the magnetic properties of the final product. The pressing process determines the initial density and shape of the block, providing a foundation for subsequent sintering.

Sintering

Pressed blocks are then sintered at high temperatures in a controlled atmosphere. Sintering consolidates the powder into a dense, solid structure while preserving the desired magnetic alignment. Temperature and atmosphere control are critical to prevent oxidation and maintain magnetic performance.

Machining and Surface Treatment

After sintering, the blocks are machined to precise dimensions. This may include cutting, grinding, or drilling depending on application requirements. Surface treatment, such as coating with nickel, epoxy, or zinc, is applied to improve corrosion resistance and mechanical durability.

Magnetization and Quality Inspection

Finally, the blocks are magnetized in a strong magnetic field and undergo quality inspections. Parameters such as magnetic strength, dimensional accuracy, and surface quality are checked to ensure the magnets meet design specifications.

Through these steps, NdFeB block magnets are produced with consistent magnetic performance and structural integrity, making them suitable for a wide range of industrial and consumer applications.

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These are ring neodymium magnets with holes used in various applications where they can be stuck and repositioned with ease during use. Neodymium ring magnets are one of the strongest permanent magnetic materials available and have high resistance to demagnetization. They are ideal for applications such as jewelry, watch bands, security systems, calculators, and games.