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2019-08-12 15:52:56

Characteristics and Processing Technology of NdFeB Magnets

NdFeB magnets as the latest achievement in the development of rare earth permanent magnets, is known as the "King of Magnets" because of its excellent magnetic properties. NdFeB magnetic materials are alloys mainly composed of neodymium and iron oxide. Also known as magnet steel. NdFeB permanent magnet material has been widely used in modern industry and electronic technology because of its high magnetic energy product, magnetic correction force and high energy density. It makes it possible to miniaturize, lightweight, thin, electro-acoustic motor, magnetic separation and magnetization of the instrument. The advantage of NdFeB is its high cost performance and good mechanical properties. Its disadvantage is low Curie temperature point, poor temperature characteristics and easy to occur powder corrosion. In order to meet the needs of practical application, it must be improved by adjusting its chemical composition and adopting surface treatment methods.


NdFeB permanent magnet material is a kind of permanent magnet material based on intermetallic compound RE2FE14B. The main components are rare earth (Re), iron (Fe) and boron (B). In order to obtain different properties of rare earth Nd, in order to obtain other rare earth metals such as Dy, Pr and other rare earth metals, iron can also be replaced by other metals such as cobalt (Co), aluminum (Al) and boron. However, it plays an important role in the formation of tetrahedral intermetallics, which makes these compounds have high saturation magnetization, high uniaxial anisotropy and high Curie temperature.


The third generation rare earth permanent magnet NdFeB is the strongest permanent magnet material in the contemporary permanent magnet materials. Its main raw materials are neodymium 29% 32.5% iron 63.95% 68.65% non-metallic boron 1.1% dysprosium 0.61.2% niobium 0.30.5% aluminium 0. 30.5% copper 0.05 0.15% and other elements


Process flow: batching, ingot casting, smelting/belt washing, powder pressing, sintering, tempering, magnetic inspection, grinding, pin cutting, electroplating finished products. Among them, batching is the foundation, sintering and tempering are the key.


NdFeB magnets blank production tools and performance testing tools: melting furnace, pendulum furnace, Hubei crusher, air grinding, pressing forming machine, vacuum sealing machine, isostatic pressure, sintering furnace, heat treatment vacuum furnace, magnetic performance tester, Gauss meter, etc.


NdFeB magnet processing tools: centerless grinding, round rolling machine, double-end grinding, flat grinding, slicing machine, double-sided grinding, wire cutting, Tianjin high speed, Xihutai drill, special-shaped grinding, etc.


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