Loading patent…
AssigneeSumitomo Special Metals Co., Ltd.
InventorsYuji Kaneko, Yasuhide Sasakawa, Katsuya Kase, Takashi Hashikawa, Kaname Takeya
Estimating the term…
It is an object of the present invention to provide a method for manufacturing a raw material alloy powder that can be utilized effectively in the regeneration of surplus or defective R--Fe--B type sintered magnets while leaving the main phase crystal grains alone, and a method for manufacturing an R--Fe--B type magnet. Surplus or defective R--Fe--B type sintered magnets are pulverized, acid washed, and dried, after which this product is subjected to a calcium reduction treatment and washed to remove the calcium component, which allows a raw material alloy powder composed of an Nd.sub.2 Fe.sub.14 B main phase system, which contributes the most to magnet characteristics, to be regenerated efficiently. An alloy powder for compositional adjustment that improves sintering and adjusts the composition is added to this main phase system raw material alloy powder to produce a sintered magnet, which facilitates the manufacture of a sintered magnet with superior magnet characteristics.
A method for manufacturing an R--Fe--B type magnet raw material powder which yields an R--Fe--B type alloy powder composed almost solely of an Nd.sub.2 Fe.sub.14 B main phase, comprising the steps of:
A method for manufacturing an R--Fe--B type magnet raw material powder which yields an R--Fe--B type alloy powder composed almost solely of an Nd.sub.2 Fe.sub.14 B main phase, comprising the steps of:
A method for manufacturing an R--Fe--B type magnet raw material powder which yields an R--Fe--B type alloy powder composed almost solely of an Nd.sub.2 Fe.sub.14 B main phase, comprising the steps of:
A method for manufacturing an R--Fe--B type magnet, wherein an alloy powder used for compositional adjustment is added to an R--Fe--B type alloy powder composed almost solely of an Nd.sub.2 Fe.sub.14 B main phase and obtained by the steps of:
A method for manufacturing an R--Fe--B type magnet, wherein an alloy powder used for compositional adjustment is added to an R--Fe--B type alloy powder composed almost solely of an Nd.sub.2 Fe.sub.14 B main phase and obtained by the steps of:
Dependencies are inferred from the claim text.