HYDROGEN DECREPITATION (HD), HISTORY AND APPLICATIONS IN THE PRODUCTION OF PERMANENT MAGNETS

An essential information about history and applications of Hydrogen Decrepitation has been generally reported. Very important technical details about the HD route were summarized, as well as fabrication procedure of Nd16Fe76B8 permanent magnet. Some micro strucural of SEM images of hydride and sintered magnets were given to demonstrate the advantage of using the HD process in the production of Rare Earth magnets. In addition, recycling of Nd-Fe-B sintered magnets by employing the HD route has been investigated. This process is very important in the industrial sector for maintaining the environment and providing the raw materials for permanent magnets production with less cost. In reality, the HD method found to have the following advantages in the manufacturing of Rare Earth magnets; Simplicity, Reducing the sintering temperature, and Enhancing the coercivity of the produced magnets.