Process-saving manufacturing method of sintered Nd-Fe-B series magnet

A production method and technology of sintered magnets, which are applied in the field of magnet production to achieve the effects of saving rare earth resources, simplifying the production process, and reducing production costs
CN102956337AActive Publication Date: 2013-03-06FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
Publication Date
2013-03-06

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Abstract

The invention discloses a process-saving manufacturing method of a sintered Nd-Fe-B series magnet. In a process of manufacturing the Nd-Fe-B series sintered magnet with oxygen content being below 2,500 ppm in the sintered magnet, a lamellar alloy raw material obtained by processes before a hydrogen demolishment pulverization process and with average thickness of 0.1-0.5 mm is used in a hydrogen demolishment pulverization process; hydrogen demolishment pulverization of not more than 24 hours is kept under the hydrogen pressure being above 0.01 MPa and below 1 MPa; then air stream pulverization is not performed; forming is directly performed by using a magnetic field forming method; and sintering is performed at the temperature of 900-1,140 DEG C under vacuum or in inert gas. The method realizes that the air stream pulverization process can be omitted to fulfill the aims of effectively utilizing precious rare earth resources, simplifying processes and performing low-cost production, and in addition, an oxidation effect which cannot be avoided in the air stream pulverization method in any way can also be prevented, so that the process is substantially a non-oxidative process, and large-scale manufacturing of ultrahigh-performance magnet is made possible.
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Description

technical field

[0001] The invention relates to the technical field of magnet manufacture, in particular to a manufacturing method of a sintered Nd-Fe-B system (neodymium-iron-boron) magnet without steps. Background technique

[0002] A magnet is an object that can generate a magnetic field. It is a magnetic dipole that can attract ferromagnetic substances such as iron, nickel, cobalt and other metals. Nd-Fe-B series (neodymium-iron-boron) magnet is a kind of magnet. It is the magnet with the highest commercial performance found at present. It is known as the king of magnetism. It has extremely high magnetic properties and its maximum magnetic energy product ( BH)max is more than 10 times higher than ferrite (Ferrite); its own machining performance is also quite good, the working temperature can reach up to 200 degrees Celsius, and its texture is hard, stable performance, and good cost performance, so its The application is extremely wide.

[0003] There are two manufactur...

Claims

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