Anisotropic magnet powder and manufacture thereof

Abstract

Abstract PURPOSE:To preserve the anisotropy of magnetic powder thereby to apply it to a plastic magnet or the like as it is without necessity of annealing by hot plasticizing an alloy magnet of rare earth element, iron and boron, and pulverizing the magnet. CONSTITUTION:Magnet powder contains by wt.% 18-63% of rare earth element, 0.2-6% of B and the residue of Fe. The following steps are executed. Raw materials are mixed and heated to be melted. Then, molten alloy is injected from a quartz nozzle to a cooling roll in an inert gas atmosphere, cooled at a high speed, and a ribbon having several ten mum of thickness is formed. This ribbon is so pulverized by a mill in an inert gas atmosphere as to become particle diameter of several-several hundred mum. This powder is pressure molded. This molding is plastically worked by a machine 1 for extruding the material 6 in a direction of an extruding hole 5 by a ram 6 in a heated state to obtain a bulklike magnet in which its crystal axis is aligned in a C-axis direction. This magnet is pulverized to obtain magnet powder.

Inventors

• 👤 Jun Nakagawa
• 👤 準 中川

Bibliographic Details