Production manner of the rare earth sintering magnet, in the comminution mannered null raw materials alloy powder of the raw materials

摘要

PPROBLEM TO BE SOLVED: To provide a manufacturing method of a rare earth sintered magnet suppressing the amount of a lubricant added to the utmost and obtaining a compact with high strength and a sintered magnet with high magnetic characteristics, and a method of pulverizing raw alloy powder for the sintered magnet. PSOLUTION: In manufacturing a rare earth sintered magnet, a lubricant having a particle size of 425 μm or below is added to the coarsely pulverized powder obtained by coarsely pulverizing a raw alloy. Then, it is pulverized by a jet mill to obtain finely pulverized powder. Then, this finely pulverized powder is formed in a magnetic field to form a compact. This compact is sintered to obtain the rare earth sintered magnet. To bring the particle size to 425 μm or below in the lubricant, the lubricant is preferably pulverized in a frozen state and classified. PCOPYRIGHT: (C)2006,JPO&NCIPI