Method and device for producing alloy powder for permanent magnet

Abstract

A series of alloy powder manufacturing processes from hydrogen adsorption to pulverization and cooling can be implemented continuously and feasible. The present invention relates to a production apparatus and production method of alloy powder for permanent magnets, which pulverize raw material alloy ingots containing rare earth elements, metal elements, and boron elements to obtain alloy powders. The structure of the device is that the hydrogen adsorption part, the heat treatment part and the cooling part are arranged in sequence along the central axis, and these parts are combined into an integrated container at the same time. The integrated container can be rotated forward and backward. For example, the hydrogen adsorption part and the cooling part have groove-shaped or pin-shaped spiral parts, respectively, and the spiral directions of the spiral parts in the hydrogen adsorption part and the cooling part are opposite to each other. The inner peripheral surface of the heat treatment portion has a protruding portion. A gas introduction pipe is provided on the inlet side of the hydrogen adsorption part of the integrated container, and an exhaust pipe is provided on the outlet side of the cooling part, and a hydrogen supply device and an inert gas supply device are provided at the gas introduction pipe. . With these structures, a series of coarse pulverization processes from hydrogen adsorption to pulverization and cooling can be continuously performed.

Description

technical field [0001] The present invention relates to an apparatus and method for producing alloy powder used in the production of permanent magnets such as rare earth sintered magnets. Specifically, it relates to a technique for effectively implementing a series of processes including hydrogen adsorption, pulverization, and cooling. Background technique [0002] For example, R-B-M types such as Nd-Fe-B (R is one or more rare earth elements including Y, M is an essential component of Fe and contains other metal elements) sintered magnets have good magnetic properties and as the main component Nd has the advantages of abundant resources and low price, so its demand has greatly increased recently. In view of this situation, research and development to improve the magnetic properties of R-B-M sintered magnets, and improvement of the manufacturing method for producing high-quality rare earth sintered magnets have been carried out. [0003] As a method of manufacturing rare ea...

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Problems solved by technology

In order to avoid this phenomenon, it is considered that it is better to expand the hydrogen adsorption area, but this will cause the enlargement of the device and the complexity of management.

[0011] In addition to the hydrogen adsorption process, the subsequent heat treatment process and cooling process are also performed separately, so it is very cumbersome

Patent Document 2 describes the continuous treatment of hydrogen adsorption process and heat treatment, but in terms of actual treatment, this document does not describe the effective and feasible composition of each process

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