The theoretical (BH)max value of NdFeB magnet is 512kJ/m3(64MGOe), and most of magnet manufacturer can make N52 magnet now. The (BH)max of N52 already achieved 90% of theoretical limit. The question in the mind of many users – is there any grade stronger than N52 magnet? N55 is the most powerful grade available currently for commercial use.
How to get make N55 magnet
- Scientific composition designs will ensure the NdFeB magnet have desirable saturation magnetization. It is important to avoid the elements use which affects the saturation magnetization of Nd2Fe14B main phase.
- Decrease the non-magnetic phaseto raise the volume ratio of Nd2Fe14B main phase. The Nd-rich phase needs more rational proportion and distribution. The α-Fe, oxide and carbide from production process will also avoid the magnetic properties of magnet.
- Enhance the orientationdegree of Nd2Fe14B main phase.
- The ideal microstructuralwill improve the ratio of positive domain.
- Enhance the magnet’s density.
The demagnetization curve of N55 magnet
The notes about N55 magnet
- In order to guarantee the N55 magnet have desirable saturation magnetization, the manufacturer will not use the heavy rare earth elements and other metallic elements to enhance the intrinsic coercivity of magnet, then will further influence the Max. Operating Temperature of magnet. The Max. Operating Temperature of N55 magnet only about 60 deg C.
- The N55 magnet have strong attraction force, any may cause bone fractures.
