Apparatus and method for preparing nd-rich phase nd2fe14b/α-fe permanent magnets by stepped hot extrusion

A nd2fe14b, hot extrusion technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., to achieve high magnetic performance, reduce the appearance of cracks, and simple device structure

Active Publication Date: 2014-10-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a device and method for preparing Nd-rich phase Nd2Fe14B / α-Fe permanent magnets by step-type hot extrusion to solve the technical bottleneck problem of preparing bulk nanocomposite magnets

Method used

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  • Apparatus and method for preparing nd-rich phase nd2fe14b/α-fe permanent magnets by stepped hot extrusion

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Experimental program
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specific Embodiment approach 1

[0009] Specific implementation mode one: combine figure 1 Describe this embodiment, the device of this embodiment includes an upper template 1, a backing plate 2, a punch fixing sleeve 3, an extrusion punch 4, an extrusion die sleeve 5, a resistance wire 6, a lower template 7, a first-stage extrusion Die 8, secondary extrusion die 9 and heating sleeve 13, the lower end surface of the upper template 1 is affixed to the upper end surface of the backing plate 2, and one end of the extrusion punch 4 is installed in the punch fixing sleeve 3 and connected to the backing plate 2. The lower end surface of the plate 2 is connected, the end of the backing plate 2, the punch fixing sleeve 3 and the extrusion punch 4 are all installed in the heating sleeve 13, the upper end surface of the heating sleeve 13 is fixedly connected with the upper template 1, and the extrusion die Cover 5 is provided with a first-stage extrusion die 8 and both are connected with the lower template 7, the first...

specific Embodiment approach 2

[0010] Specific implementation mode two: combination figure 1 Describe this embodiment, the angle between the generatrix of the primary extrusion die 8 and the diameter of the bottom circle in this embodiment is 5°-10°, the extrusion punch 4, the primary extrusion die 8 and the secondary extrusion Die 9 is processed by H13 forging billet, quenched and tempered to HRC48-52, extrusion die sleeve 5 is processed by 5CrNiMo forged billet, quenched and tempered to HRC45-48, so that the extrusion die and extrusion die can be ensured. Good comprehensive performance ensures the smooth progress of the extrusion process. Other implementation manners are the same as the specific implementation manner 1.

specific Embodiment approach 3

[0011] Specific embodiment three: the device of the present embodiment also includes a thermal insulation layer 12, the outer casing thermal insulation layer 12 of extrusion die cover 5, and the lower end surface of the thermal insulation layer 12 is affixed to the upper end surface of the lower formwork 7, so that electric energy can be saved , to ensure fast mold temperature rise and improve mold life. Other implementation manners are the same as the specific implementation manner 1.

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Abstract

The invention discloses a device and a method for step type hot extrusion preparation of an Nd-phase-rich Nd2Fe14B / alpha-Fe permanent magnet, and relates to a device and a method of preparation of the Nd2Fe14B / alpha-Fe permanent magnet. The device and the method for step type hot extrusion preparation of the Nd-phase-rich Nd2Fe14B / alpha-Fe permanent magnet solve the technical bottleneck of preparing a block nano complex phase magnet. The device is formed by an extrusion puncher pin, a primary extrusion die, a secondary extrusion die, a die fixing sleeve and a heating device and the like. The method mainly comprises that Nd-phase-rich Nd2Fe14B powder is mixed with alpha-Fe powder, the powder mixed by a ball mill is stirred, a cold pressing blank of the Nd-phase-rich Nd2Fe14B powder and the alpha-Fe powder is prefabricated, vacuum packaging is carried out, the blank and the dies are heated, and step hot extrusion is carried out. The device and the method for step type hot extrusion preparation of the Nd-phase-rich Nd2Fe14B / alpha-Fe permanent magnet are used for preparing a block dense high-performance nano coupling permanent magnet.

Description

technical field [0001] The invention relates to a device and method for preparing Nd2Fe14B / α-Fe permanent magnet. Background technique [0002] Nanocrystalline composite phase rare earth permanent magnet material is a new type of permanent magnet, which has high remanence, high magnetic energy product, relatively high coercive force, low rare earth content and good chemical stability. It is a widely used Prospects for cheap rare earth permanent magnet materials. Nano-composite rare earth permanent magnet materials have become a research hotspot for scholars from all over the world because of their high comprehensive magnetic properties. Nanocrystalline rare earth permanent magnets are different from traditional permanent magnets. As the grain size decreases, the specific surface area increases, and the intergranular exchange coupling effect is significantly enhanced. In traditional permanent magnets, the intergranular exchange coupling effect can be reasonably ignored, whil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/20H01F1/057H01F1/08H01F41/02
Inventor 姜巨福王迎
Owner HARBIN INST OF TECH
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