Production of NdFeB magnets by the rapid solidification processing route

Abstract

Alloy has been melt-spun to yield amorphous and crystalline ribbon which has been incorporated into polymer bonded magnets produced by compression moulding. A detailed study of the compression moulding proces shows that improved metal loading can be achieved with a floating die to minimise load transfer to the die walls. Studies of the hot-pressing process highlighted the difficulty of selection of die and ram materials, but demonstrated that the magnetic properties of the pressings were reasonably insensitive to the pressing procedure employed. Corrosion protection studies on hot-pressed magnets established that satisfactory protection could be achieved, and that procedures developed for coating sintered magnets were equally applicable to hot pressed compacts.