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EspañolSintered NdFeB magnets are among the powerful permanent magnets available today, widely used in various industries and applications. The manufacturing process of these magnets involves several intricate steps that transform raw materials into high-performance magnetic components. In this article, we will explore the manufacturing process of sintered NdFeB magnets, taking a closer look at each stage and the technologies involved.
Raw Material Preparation:The manufacturing process begins with the preparation of raw materials. Neodymium (Nd), iron (Fe), and boron (B) are combined with small amounts of other elements to form a mixture. These elements are carefully selected and weighed to achieve the desired magnetic properties.
Melting and Alloying:The raw materials are melted in a controlled environment, typically using an induction furnace. The molten alloy undergoes alloying to ensure a homogeneous composition. Alloying involves precise temperature control and mixing techniques to achieve a uniform distribution of neodymium, iron, and boron.
Powder Production:The molten alloy is rapidly quenched to form a fine powder through a process known as rapid solidification or melt spinning. The quenching process solidifies the molten alloy at a high cooling rate, resulting in a highly crystalline and magnetically oriented structure.
Powder Milling:The as-quenched powder is then subjected to milling processes to refine its particle size and enhance its reactivity. Various milling techniques, such as ball milling or jet milling, are used to reduce the powder size and promote a more uniform distribution of particle sizes.
Pressing: NdFeB magnet manufacturers will use pressing technology to press the ground powder into the desired shape. Typically, the powder is placed in a die and subjected to high pressure to form a compacted green magnet. The pressing process ensures the powder particles adhere to each other, creating a coherent structure.
Sintering:The compacted green magnet is then subjected to a sintering process. In this step, the green magnet is heated to a high temperature in a controlled atmosphere, often in a vacuum or protective gas environment. The heat causes the powder particles to bond, resulting in densification and the formation of a solid magnet structure.
Machining and Finishing:After sintering, the magnet undergoes machining processes to achieve the desired shape, dimensions, and surface finish. Techniques such as grinding, cutting, and polishing are employed to remove excess material and refine the magnet's appearance.
Surface Treatment and Coating:To protect the magnet from corrosion and improve its performance, a surface treatment or coating is applied. Common surface treatments include nickel-copper-nickel plating or epoxy coating, which provide a protective layer while maintaining the magnet's magnetic properties.
Quality Control and Testing:Throughout the manufacturing process, quality control measures are implemented to ensure the magnets meet the required specifications. Various tests, such as magnetic property measurements, dimensional checks, and visual inspections, are conducted to ensure the magnets meet the desired standards.
The manufacturing process of sintered NdFeB magnets is a complex and precise series of steps, involving the transformation of raw materials into powerful magnetic components. From raw material preparation to sintering and finishing, each stage is crucial in achieving magnets with exceptional magnetic properties.
●The tile neodymium iron boron magnet is named after its extremely similar shape to the tile, and more than one-third of its output is used to manufacture various permanent magnet motors. Permanent magnet motor has the advantages of electricity saving, electricity saving, light weight, small size, high specific power. Electric bicycle motors, computer driven motors, lathes, etc. are used to measure the speed and rotation speed of motors, elevator traction motors, refrigerator air conditioning motors, wind turbines, automobile motors, etc., which are widely used.
●The Sintered NdFeB Magnet is powerful permanent magnet in modem times. It is not only has excellent properties such as high remanence, high coerce, high magnetic energy product .high performance price ratio and so on,but also is development of high-performance,miniaturized and lightweight replacement products.
●The consistency and stability of products between each orders, provides safeguard to our customers. For example, the consistency of (BH)max reaches 6o (Cpk1.67 or above).
●In order to raise working temperature of our products, Dingfeng Magnetics works hard to realize better high thermal stability and low thermal demagnetization, developed the series VH series products which can work at temperature higher than220℃.
