magnet strong magnetic round small magnet ndfeb d6 * 2mm 磁铁 强磁 圆形 小磁铁 钕铁硼 D6*2MM

Neodymium-iron-boron magnets: Neodymium-iron-boron is the magnet with the highest commercial performance known so far. It is referred to as the "magnetic king" and possesses extremely high magnetic properties, with a maximum magnetic energy product (BHmax) more than 10 times that of ferrite. Therefore, it is also commonly called strong magnets or magnetic steel. Its mechanical processing properties are also quite good. The operating temperature can reach up to 200 degrees Celsius. Moreover, it has a hard texture, stable performance, and excellent cost-performance ratio, which explains its wide range of applications. However, due to its strong chemical reactivity, surface treatment is necessary.

Neodymium-iron-boron permanent magnet materials are based on the intermetallic compound Nd2Fe1₄B. Compared to cast Al-Ni-Co series permanent magnet materials and ferrites, neodymium-iron-boron possesses extremely high magnetic energy product and coercivity, capable of attracting objects weighing 640 times their own weight. The advantage of its high energy density has enabled neodymium-iron-boron permanent magnet materials to be widely used in modern industry and electronic technology, making it possible to miniaturize, lightweight, and thinen devices such as instruments, electromechanical motors, and magnetic separation and magnetization systems. A key advantage of this material is its high performance-to-cost ratio, good mechanical properties, and ease of machining; however, its disadvantage lies in a low Curie temperature point, poor thermal characteristics, and susceptibility to powdering and corrosion. These issues must be addressed by adjusting its chemical composition and applying surface treatment methods to meet practical application requirements.
The neodymium-iron-boron manufacturing process uses powder metallurgy technology. Raw materials such as neodymium, dysprosium, iron, cobalt, niobium, praseodymium, aluminum, copper, and boron-iron are smelted into alloy steel ingots using an intermediate-frequency induction melting furnace. These ingots are then crushed into powder with a particle size of 3–5 μm, pressed into shape under a magnetic field. The formed green mass is sintered densely and aged in a vacuum sintering furnace to produce a permanent magnet blank with desired magnetic properties. After processing steps including grinding, drilling, and slicing, and surface treatment, the final neodymium-iron-boron product required by the customer is obtained.