MANUFACTURING OF THERMAL PLASTIC BONDED NdFeB PERMANENTMAGNET WITH HIGH MAGNETIC PROPERTIES

The manufacturing process of the high density bonded NdFeB permanent magnet which consists of nylon1010 and rapidly quenching NdFeB powder has been studied, and its effects on the magnetic properties of bonded NdFeB magnet have also been investigated. The results show that the surface state of rapidly quenching NdFeB powder, the mixing process, in which NdFeB powder and nylon1010 are mixed uniformly, and the hot press process of bonded NdFeB magnet affect obviously the magnet properties of the nylon1010 bonded NdFeB permanent magnet. The magnetic properties of bonded NdFeB magnet with NdFeB powder, which is treated to have higher oxidation resistance are much higher than those with nontreated NdFeB powder. Only in a mixing process of NdFeB powder and nylon1010 on the doubleaxes mixing machine when nylon1010 is in a halfmelting state and the mixing time is shorter, can the permanent magnetic properties of bonded NdFeB can higher. The hot pressing temperature and pressure affect more obviously on the magnetic properties than the pressing time does.