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On sintering process of NdFeB magnet

by:Newland     2020-03-09
The Ferroboron magnet is sintered by the boron ferromagnet and the bonded boron ferromagnet. The sintering problem of the Ferroboron magnet is mainly discussed. The process of NdFeB magnet is as follows: Process Flow: preparation, pressing and sintering, tempering, magnetic measurement, nail grinding and electroplating of steel ingot powder. Among them, raw materials are the basis and sintering and tempering are the key. NdFeB magnet production tools: smelting furnace, Crusher, ball mill, air Mill, pressure molding machine, vacuum packaging machine, isostatic press, sintering furnace, heat treatment vacuum furnace, magnetic performance tester, Gauss meter. Nd-Fe- B magnet processing tools: special cutting machine, wire cutting machine, flat Mill, double-sided machine, drilling machine, chamfering machine, electroplating equipment. Features: NdFeB permanent magnet material is a permanent magnet material based on intermetallic compound Nd2fe14b. NDFeB has the advantages of very high magnetic energy products and correction force, and the advantages of high energy density make NDFeB permanent magnet materials widely used in modern industry and electronic technology, therefore, the miniaturization, reduction and miniaturization of instruments, electroacoustic machines, magnetic separation magnetization and other equipment are possible. Material characteristics: NdFeB has the advantages of high cost performance and good mechanical properties. Its disadvantages are low Curie temperature, poor temperature characteristics, easy pulverization and corrosion. Its performance must be improved by adjusting its chemical composition and adopting surface treatment methods to meet the requirements of practical application. Sintering process of ND-Fe-B magnet materials the Fe-B magnet materials must go through chamfering, oil removal, acid pickling, ultrasonic cleaning and other processes to stably clean the surface before sintering, so as to obtain a coating with good bonding performance, low porosity and corrosion resistance. The small Chamfering part can be chamfered by centrifugal polishing machine. Large parts can be polished with grinding wheel and chamfered with spiral vibration or centrifugal vortex polisher. Chamfering shall be carried out in neutral or weakly alkaline media, and acids containing chamfering or corrosive media shall not be used. Degreasing should be carried out in neutral and weakly alkaline degreasing agents. In order to avoid oxidation or hydrogen permeation, it is best not to carry out anode or cathode electrolysis treatment. Pickling dilute nitric acid solution or weak organic acid should be pickled in a short time, but should not be pickled in strong halogen acid; Pickling in high concentrations of strong acids should not be avoided; Otherwise, the material surface should be quickly rough or crushed.
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