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Alloy composition, magnetic material, bonded magnet and manufacturing method thereof

A technology of bonded magnets and magnetic materials, applied in the field of magnetic materials and bonded magnets, and the manufacture of such alloy compositions, can solve the problems of low aging performance, increased aging loss of magnetic flux, and reduced thermal stability.

Active Publication Date: 2022-04-29
MAGNEQUENCH (TIANJIN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the known Nd-Fe magnets containing Ce have the disadvantages of reduced thermal stability and increased magnetic flux aging loss
These known issues with the use of Ce in such magnets have led magnet manufacturers to worry about choosing cerium-containing materials due to the risk of lower aging performance.

Method used

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  • Alloy composition, magnetic material, bonded magnet and manufacturing method thereof
  • Alloy composition, magnetic material, bonded magnet and manufacturing method thereof
  • Alloy composition, magnetic material, bonded magnet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0198] Example 1 - Bonded Magnets

[0199] Typically, dry-mix bonded magnets are manufactured using standard hydraulic presses. The magnetic powder was mixed with 1.55wt% epoxy resin and 0.1wt% zinc stearate and mixed for 30 minutes using a V-blender. For all sample groups, at 7 tons / cm 2 The bonded magnets were pressed and cured at 180°C for 30 minutes. The diameter of the magnet sample was 9.75 mm, and to maintain a BH load line value of 2, a magnet height of 6.4 mm (-2.85 grams of powder) was targeted.

Embodiment 2

[0200] Embodiment 2-adjusting rare earth content to H ci Impact

[0201] The inventors of the present invention have surprisingly found that the aging performance of bonded magnets is related to the H ci values ​​are strongly correlated. It has been found that in order to achieve low flux aging loss, H ci Must remain high at elevated temperatures.

[0202] Figure 4 A comparison of the magnetic flux aging loss (1000 hours at 125°C) for various embodiments of bonded magnets of the present invention and the MQP control is shown (see Table 1). The PC of the magnet is 2. It can be seen that magnets made from the alloy compositions or magnetic materials of the present invention exhibit lower magnetic flux aging losses (about -3% to -4%) compared to the MQP controls (about -5% to -6%) . Figure 4 It is also shown that the aging performance of the magnet is related to the H ci The values ​​(at 24°C and 120°C) are linearly correlated. It can be seen that magnets with lower fl...

Embodiment 3

[0210] Example 3 - Effect of Adjusting Rare Earth Content

[0211] The inventors of the present invention have surprisingly and advantageously found that by adjusting the rare earth content to increase H ci , the thermal stability and aging properties of the disclosed compositions show significant improvements and are less expensive to produce.

[0212] Furthermore, although cerium is a lower cost and more abundant rare earth element, it is known that the inclusion of cerium in permanent magnets results in poorer thermal stability (see Comparative Example 1). However, the inventors have surprisingly and advantageously discovered that the inclusion of cerium in the rare earth content of magnets not only improves aging performance, but also leads to significant cost savings.

[0213] Table 1 below shows the properties and aging performance of an embodiment of the bonded magnet of the present invention compared to bonded magnet MQP-14-12.

[0214]

[0215] MQP-14-12 is a com...

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Abstract

The present invention relates to alloy compositions of formula (I): RE x ‑Fe 100‑x‑y‑z -B y -M z , where RE is two or more rare earth metals, M is one or more refractory metals, and x, y, and z are atomic %, where 10.5≤x≤14, 5.5≤y≤6.5, and 0.5≤z ≤1.5. A composition described in the present invention has formula (II): [(Pr a Nd (1‑a) ) b Ce 1‑b ] x ‑Fe 100‑x‑y‑z -B y -M z , where a and b are 0.20≤a≤0.50 and 0.40≤b≤1.00. The invention also relates to a magnetic material, a bonded magnet comprising the same, and a method of manufacturing the bonded magnet.

Description

technical field [0001] In general terms, the present invention relates to alloy compositions, magnetic materials and bonded magnets. The invention also relates to methods of making such alloy compositions, magnetic materials and bonded magnets. Background technique [0002] Bonded magnets, such as rare earth-based magnets, are used in many applications, including computer hardware, automobiles, consumer electronics, and home appliances. Such magnets need to have good resistance to demagnetization at elevated temperatures, for example when used in electric motors for household appliances and the like, for efficient motor operation. The temperatures involved in these motor applications are typically in the range of 100°C to 150°C. Therefore, good resistance to demagnetization is required in this temperature range. [0003] When dealing with the thermal stability of bonded magnets, conventional wisdom usually involves three factors: the Curie temperature (T c ), reversible ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0578H01F41/0266
Inventor 林永杰
Owner MAGNEQUENCH (TIANJIN) CO LTD
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