Comparison of NdFeB and hard ferrite, due to its high coercivity, high energy product and other features, make it this plot the weight of his body made of the weight of the motor reduces the size of 5 ~ 10 times. Therefore, the more expensive price was gradually accepted. Therefore, it's usage increases, more and more widely used. Bonded Nd-Fe-In
The use of boron in the process of how the moisture / antioxidant then? Generally have the following several ways:
(1) Coating Method
General coating some of the organic resin, silicone or some insulating moisture-proof material.
A result of coating material to be coated with solvent, solvent to evaporate, leaving a lot to the coating layer of the pores. Some have a hydrophilic coating material itself, year after year in the water to penetrate into, resulting in Nd-Fe-damp oxidation, so that performance degradation.
(2) plating method
This method generally used for sintered NdFeB, bonded NdFeB some also used, but a lot of shortcomings. By binder insulating material is generally the same time, the manufacture of solvent evaporation due to the formation of bonding many capillary Road. Therefore, the hole and conductive adhesives can not constitute a loop, the metal material plated see these places.
For example, the Nd-Fe-Ni, macro view, the surface shiny, but with a microscope observation, fraught with problems.Therefore, the moisture can still penetrate inside, so that Nd-Fe-oxidation, the decrease of magnetic properties.
(3) Nano Technology Law
(A) high density, the product is almost non-existent capillary Road, and to lead to materials with Growth. So it is Ideally, moisture-proof, anti-oxidation method.
(B) does not change the product shape and size, using coating method and plating method to process the surface of NdFeB products have a certain thickness, mechanical measurements, such as with the 1000 points card, you can measure the increase in thickness; and nano-technology method to measure the thickness of the increase could not NdFeB products.
(C) processed products, high reliability and long service life. Is well known, coating method and plating method for processing products, using a long time, and may have skin effect phenomenon, the product has been exposed to the air, is likely to be made into products scrapped. Nanotechnology Law does not exist the problem.