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Introduction of characteristics and processing technology of neodymium iron boron magnet

February 26, 2019

NdFeB magnetic materials, as the latest result of the development of rare earth permanent magnet materials, are called "Magnetic King" due to their excellent magnetic properties. The neodymium iron boron magnetic material is an alloy of niobium, iron oxide or the like. Also known as magnetic steel. NdFeB has a very high magnetic energy product and strength, and the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industrial and electronic technology, so that instrumentation, electroacoustic motor, magnetic separation magnetization It is possible to reduce the size, weight, and thickness of equipment. The advantages of NdFeB are high cost performance and good mechanical properties. The disadvantages are low Curie temperature, poor temperature characteristics, and easy chalking. It must be improved by adjusting its chemical composition and surface treatment. In order to meet the requirements of practical applications.

The third generation rare earth permanent magnet NdFeB is the most powerful permanent magnet in contemporary magnets. Its main raw materials are rare earth metal neodymium 29%-32.5% metal element iron 63.95-68.65% non-metallic element boron 1.1-1.2% small amount added dysprosium 0.6-1.2% niobium  0.3-0.5% aluminum 0.3-0.5% copper 0.05-0.15% and other elements.

The NdFeB permanent magnet material is a permanent magnet material based on the intermetallic compound RE2FE14B. The main components are rare earth (Re), iron (Fe), and boron (B). Among them, rare earth ND can be replaced by other rare earth metals such as Dy and Pr, in order to obtain different properties. Iron can also be replaced by other metal parts such as cobalt (Co) and aluminum (Al), and the content of boron is small, but However, it plays an important role in forming a tetragonal crystal structure intermetallic compound, so that the compound has high saturation magnetization, high uniaxial anisotropy and high Curie temperature.

Process: ingredients → smelting ingots / smashing → milling → pressing → sintering tempering → magnetic testing → grinding processing → pin cutting processing → plating → finished products. Where the ingredients are the basis, sintering and tempering are the key.

NdFeB magnet blank production tools and performance testing tools: smelting furnace, belt furnace, E-breaker, jet mill, press forming machine, vacuum packaging machine, isostatic press, sintering furnace, heat treatment vacuum furnace, magnetic performance test Instrument, Gauss meter.

NdFeB magnet machining tools: non-heart grinding, rounding machine, double-end grinding, flat grinding, slicer, double-sided grinding, wire cutting, Tianjin high-speed, West Lake bench drill, profiled grinding, etc.