Abstract
The influence of Nd, B, and other additive compositions on the hard magnetic property of NdFeB alloy powder was studied after mechanical grinding and subsequent heat treatment. The properties are best at 14 and 7-8 atomic percent of the Nd and B compositions, respectively, after mechanical grinding for 24 hours and subsequent heat treatment at 500°C. In V, Zr, and Co, at the optimum magnetic property appears as a result of heat treatment at 600-650°C after mechanical grinding for 24 hours. However, contrary to expectations, Co addition does not improve the property. Addition of 2 atomic percent each of Dy and Pr greatly improves the property, but in the case of Pr, a rapid deterioration occurs after heat treatment at over 600°C. These changes in the magnetic property were investigated by means of X-ray analysis.
