BOND MAGNET AND COMPOSITION FOR BOND MAGNET

文件类型：PDF文档
文件大小：361K
To provide a composition for a bond magnet, by which a bond magnet superior in both of heat resistance and magnetic characteristic can be obtained while ensuring moldability.SOLUTION : A composition of the present invention comprises one or more kinds of rare earth magnet particles and a binding resin, and is used for manufacturing a bond magnet. The rare earth magnet particles include at least Nd-based magnet particles in which a rare earth element is Nd, and the total amount of the rare earth magnet particles is 90-95 mass% to a whole amount of the composition. The binding resin consists of polyamide 66(PA66) in which a total amount of terminal groups consisting of carboxyl and amino groups is 175 mmol/kg or less to a total amount of the binding resin. Even if PA66 of which the total amount of the terminal groups is adjusted touches the rare earth magnet particles serving to bring about a catalyst effect, the start of the increase in viscosity is delayed. So, the stable moldability can be ensured even if the content of the rare earth magnet particles is large. A bond magnet which can be obtained from the composition like this would be superior in both of magnetic characteristic and heat resistance.SELECTED DRAWING : Figure 2A