About the sintering process of NdFeB magnets

In terms of technology, NdFeB magnets include sintered NdFeB magnets and bonded NdFeB magnets. We mainly talk about sintered NdFeB magnets.
The Ndfeb Magnet process is as follows:
Process flow: batching → smelting and ingot making → pulverizing → pressing → sintering and tempering → magnetic testing → grinding → pin cutting → electroplating → finished product. Among them, the ingredients are the basis, and the sintering and tempering is the key.
NdFeB magnet production tools: melting furnace, jaw crusher, ball mill, jet mill, press molding machine, vacuum packaging machine, isostatic press, sintering furnace, heat treatment vacuum furnace, magnetic property tester, Gauss meter.
NdFeB magnet processing tools: there are special slicers, wire cutting machine tools, flat grinders, double-sided machines, punching machines, chamfering machines, and electroplating equipment.
Features: NdFeB Permanent Magnet material is a permanent magnet material based on intermetallic compound Nd2Fe14B. NdFeB has a very high magnetic energy product and coercive force, and at the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, thus making instruments, electroacoustic motors, magnetic separation magnetization It is possible to reduce the size, weight, and thickness of other equipment.
Material characteristics: NdFeB has the advantages of high cost performance and good mechanical properties; the disadvantage is that the Curie temperature point is low, the temperature characteristics are poor, and it is easy to be pulverized and corroded. It must be adjusted by adjusting its chemical composition and adopting surface treatment methods. It can be improved to meet the requirements of practical application.
Sintering process of NdFeB magnet material
Before sintering and electroplating, NdFeB magnet materials must undergo chamfering, degreasing, pickling, ultrasonic cleaning and other processes that can stabilize and clean the surface, so as to obtain a coating with good bonding, low porosity and long-lasting corrosion resistance.
Chamfering small parts can be chamfered with a centrifugal finishing machine, and larger parts can be chamfered with a spiral vibration or centrifugal vortex finishing machine after grinding the edges with a grinder. The chamfering should be carried out in a neutral or slightly alkaline medium, and should not be chamfered with an acidic or corrosive medium.
Degreasing should be carried out in neutral and weakly alkaline degreasers. In order to avoid oxidation or hydrogen permeation, it is best not to carry out anode or cathode electrolysis.
Pickling with dilute nitric acid solution or weak organic acid for a short time, but it should not be pickled in strong halogen acid, and should not be pickled in high concentration of strong acid, otherwise, the surface of the material will be sharply roughened or even pulverized.