Sintering method and apparatus for rare earth neodymium-iron-boron magnet

A technology of rare earth NdFeB and NdFeB, which is applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of difficult cooling of graphite boxes, improve material utilization, prevent sticking, reduce The effect of oxidation

Active Publication Date: 2016-02-10
GANZHOU DMEGC RARE EARTH MAGNET CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the above-mentioned deficiencies in the prior art, solve the problem of difficult loading and burning of NdFeB magnets and graphite box cooling for thinner NdFeB magnets, and provides a rare earth NdFeB magnet that improves the yield and product performance consistency Magnet charging method and device

Method used

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  • Sintering method and apparatus for rare earth neodymium-iron-boron magnet
  • Sintering method and apparatus for rare earth neodymium-iron-boron magnet
  • Sintering method and apparatus for rare earth neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The specification of graphite box 1 is 280mm×210×60mm, and the four corners of graphite box cover plate 2 have a height of 8mm (such as figure 1 shown).

[0029] (2) The graphite box 1 and the graphite box cover plate 2 were baked in an oven at 60° C. for 24 hours.

[0030] (3) Evenly spread a layer of high-temperature-resistant zirconia powder with an average particle size of 20um on the bottom of the graphite box 1.

[0031] (4) Place the rare earth NdFeB magnet product 4 in the graphite box 1, and evenly spread a layer of high-temperature-resistant zirconia powder with an average particle size of 20um on the contact surface between the product and the product.

[0032] (5) NdFeB waste powder with a particle size of 3.8um is placed in the gap of the graphite box 1 .

[0033] (6) Put the loaded product into the sintering furnace model VS-300RPA (rated furnace capacity 300Kg), the vacuum degree is 5×10 -2 pa, the temperature is 1060-1100°C, the sintering time is ...

Embodiment 2

[0039] This example is based on Example 1. When the products are superimposed and fired, the high-temperature-resistant zirconia powder with an average size of 20um is compared with that without it. After sintering with zirconia powder, there is no sticking between the products The junction and integrity are good and the magnetic properties remain basically unchanged. The products without zirconia powder are bonded to each other.

Embodiment 3

[0041] The present embodiment is on the basis of embodiment one and embodiment two, and product charging is compared, wherein: figure 2 It is a schematic diagram of the superimposed product loading and firing structure in this embodiment, image 3 Schematic diagram of the loading and firing structure for traditional stacked products. Carry out dimension detection, and the measurement results are shown in Table 2. Comparing the two groups of measurement data, it can be known that after using the method of this embodiment, the machining allowance reserved for each surface of the product can reduce the dimensional deformation by about 0.6mm on average, which can reduce the dimensional deformation due to The ratio of cracking and corner loss caused by sintering improves the product yield.

[0042] Table 2: Size detection after sintering in different loading and firing methods (unit: mm)

[0043]

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Abstract

The invention discloses a sintering method and apparatus for a rare earth neodymium-iron-boron magnet. The sintering method comprises the following steps specifically: (1) choosing a graphite box and a graphite cover plate with certain specifications; (2), drying the graphite box and the graphite box cover plate in a drying oven at the temperature of 60 DEG C for 8-24 hours for removing humidity; (3), uniformly paving a layer of high-temperature-resistant powder at the bottom of the graphite box; (4), putting the rare earth neodymium-iron-boron magnet products in the graphite box, and uniformly paving a layer of high-temperature-resistant powder in the contact surfaces of the products; (5), putting neodymium-iron-boron waste powder in the gaps of the graphite box; and (6), sintering the accommodated rare earth neodymium-iron-boron magnet products. The sintering method and the apparatus have the beneficial effects that the difficulties in sintering the rare earth neodymium-iron-boron magnet products with thinner thicknesses and cooling the graphite box are solved, the sintering amount of a single furnace is improved, the degree of deformation of products is effectively reduced, the material utilization is improved, the bonding of the products is prevented, the rate of finished products is improved, the oxidization of the products is reduced, and the consistence of the product performance is improved.

Description

technical field [0001] The invention relates to the related technical field of sintered NdFeB magnets, in particular to a method and device for loading and firing rare earth NdFeB magnets. Background technique [0002] In the rare earth NdFeB permanent magnet industry, the vacuum sintering of NdFeB magnets is an important link in the whole process, which directly determines the performance consistency, yield and utilization rate of products. At present, most domestic NdFeB manufacturers have started to use graphite boxes, but there are problems such as difficult dehumidification of graphite boxes, less furnace loading, poor product consistency, and difficulty in loading and burning thin products. The main reason is that the density of the graphite box is not high, only 2-4g / cm 3 , and it has a porous structure, which is easy to absorb moisture and cause product oxidation; too close direct contact between the graphite box and the graphite box will cause a large temperature d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F3/10
Inventor 黎龙贵吴美浩胡烈平金云海
Owner GANZHOU DMEGC RARE EARTH MAGNET CO LTD
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