A novel technique for manufacturing metal-bonded Nd-Fe-B magnets by squeeze casting

Abstract

A new method was developed for forming Nd-Fe-B rapidly quenched ribbon to metal-bonded magnets. The process was carried out by a squeeze casting technique. The A356 aluminum alloy and zinc alloy (ZAS) were used as metal binders. The energy product (BH) of A356-bonded magnet was 62.2 k J/m(3) and that of ZAS-bonded magnet was 61.2 k J/m(3). The maximum bending strength of ZAS-bonded magnets (259 MPa) was greater than that of A356-bonded magnets (148 MPa). The corrosion behavior of both magnets was studied in the salt spray test and the magnetization flux loss was measured. The magnetization flux loss of ZAS-bonded magnets is less than that of A356-bonded magnets due to Zn as a sacrificial anode to protect MQ powders.