PURPOSE: To improve thermal stability and time-sequent melt fluidity by comprising a plastic magnet component containing a predetermined amount of Nd-Fe-B magnetic powder, lubricant, and 12 nylon, where the Nd-Fe-B magnetic powder is coated with an aluminum coupling agent and a titanate coupling agent.
CONSTITUTION: It is essential that the blend rate of Nd-Fe-B magnetic powder is 90-95wt.% out of the whole weight of a plastic magnet composite. In case of a blend rate of less than 90wt.%, thermal stability becomes poor, and initial fluidity insufficient. It is necessary that the Nd-Fe-B magnetic powder is precoated with an aluminum coupling agent and a titanate coupling agent. This can provide a magnetic composite of high thermal stability and excellent time-sequent melt-fluidity.
KISHIDA YASUO
NISHIKAWA TETSUO
