| 摘要 |
PURPOSE:To obtain a bonded magnet with residual magnetic flux density by a method wherein the alloy powder, consisting of the microscopic crystal aggregate of the boric phase mainly composed of iron having body-centered tetragonal crystal Fe3P type crystal structure and the constituent phase of Nd2Fe14B type crystal structure, is bonded by resin. CONSTITUTION:The Fe-B-R bonded magnet is expressed by the formula Fe100-x-y-zNixByRz (R is one or two kinds of Pr and Nd), and the symbols x, y and z, with which the range of composition is limited, satisfy 0.01<=x<=2at%, 16<=y<=22at% and 3<=z<=5.5at%. The boric phase, which is mainly composed of iron and having a body-centered crystal Fe3P type crystal structure, and an Nd2Fe14B type crystal structure constituent phase are made to coexist in the same powder grains, the average crystal grain of each constituent phase is in the range of 10 to 100nm, and the powder of average grain diameter of 3 to 500mum is coupled by resin in the Fe-B-R bonded magnet. As a result, the bonded magnet, having the magnetic characteristics of iHc>=2kOe, Br>=5kG and (BH)max>=3MGOe, can be obtained. |
