Sintering process of magnet
The materials are exposed to mid frequency and
melted in an induction furnace.
After completion of various process steps, the ingots are pulverized into particles that are several microns in size. In order to prevent oxidation from occurring, the small particles are protected by nitrogen.
The magnetic particles are placed in a jig and a magnetic field is applied while the magnets are pressed into shape. Through this process, we achieve magnetic anisotropy.
The magnetic particles are placed iIngots that have been pressed are heat treated in a sintering furnace. The density of the ingots prior to sintering is about 50% of true density but after sintering, the true density is 100%. Through this process the ingots’ measurement shrink by about 70%-80% and their volume is reduced by about 50%. Aging the magnets after sintering adjusts the properties of the metals.n a jig and a magnetic field is applied while the magnets are pressed into shape. Through this process, we achieve magnetic anisotropy.
Basic magnetic properties are set after the sintering and aging processes are complete. Key measurements including remnant flux density, coercivity, and maximum energy product are recorded.Only those magnets that pass the inspection are sent to subsequent processes including machining and assembly
Due to shrinkage from the sintering process, required measurements are achieved by grinding the magnets withabrasives. Diamond abrasives are used for thisprocess because the magnet is very hard.
To best suit the environment in which they will be used, the magnets are subject to various surface treatments. Nd-Fe-B magnets are generally susceptible to rust so they are surface treated with nickel or paint.
Magnets that have been machined and plated are measured and visually inspected.To ensure the high precision,we have totest the size in order to control the tolerance.So far our normal tolerance reaches +/-0.03
Magnets that have been machined and plated are measured and visually inspected. In addition, magnetic properties, corrosion and maximum energy are tested to specifications.
Magnets that have passed product testing are packaged and shipped. Flux leakage shields are utilized for air shipment when required. XFmagnet products are shipped in NingboChina and to worldwide customer manufacturing locations