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Grain boundary engineering

A grain, average grain size technology, applied in metal processing equipment, magnetic objects, magnets, etc., can solve problems such as limited resources

Inactive Publication Date: 2017-08-01
URBAN MINING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Dy has performance-enhancing properties, its resources are limited
Risk and scarcity of Dy supply lead to shortage of high-temperature performance Nd-Fe-B magnets available for energy-efficient motor applications

Method used

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Examples

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Embodiment 1

[0115] These examples show that the GBE method can be used to improve the overall magnetic properties of permanent magnets with minimal dopants. For example, GBE method can lead to 27% increase in coercivity and 0% decrease in remanence (such as Image 6 As shown in), or 83% increase in coercivity and 6% decrease in remanence (as Figure 7 As shown in), or 60% increase in coercivity and 3% decrease in remanence (as Figure 8 Shown in). E.g, Image 6 An example of a variant of a high-energy Nd-Fe-B type sintered magnet with an additive of 0.5 atomic% (for example, Nd or Dy) is shown. The final magnet with 0.5 atomic% additives has a remanence (Br) of 1.423T, a coercivity (iHc) of 1042kA / m and 391kJ / m 3 The energy product (BHmax). Figure 7 An example of a variant of an Nd-Fe-B type sintered magnet with a 3 atomic% additive (for example Dy) that produces a high coercivity suitable for high temperature applications is shown. The final magnet with 0.3 atomic% additives has a remane...

Embodiment 2

[0175] Magnets produced using GBE technology have improved temperature performance. For example, magnets produced using GBE technology have improved thermal stability and improved magnetic properties. Recycled magnets (such as, for example, Nd-Fe-B recycled bodies from end-of-life products) can have improved thermal stability compared to input materials (e.g., pure materials) processed to produce recycled Nd-Fe-B magnets . Magnets made of imported nascent or mostly nascent Nd-Fe-B magnetic materials and processed by GBE technology can have improved thermal stability compared to magnets made by other methods.

[0176] Table 5 shows the ICP composition of two starting magnets (starting magnet 1 and starting magnet 2) and two final magnets (final magnet 1 and final magnet 3) made from the starting magnet. The final magnet 1 contains 0.5 atomic% of additive material added using GBE technology, and the final magnets 2 and 3 respectively contain 2 atomic% and 3 atomic% of additive ma...

Embodiment 3

[0192] In some instances, GBE technology can be used to dispose of waste magnets. For example, the GBE system can generate magnets (eg, using steps 902 to 908), which includes generating discarded magnets. In some instances, another method can be used to generate scrap magnets or the scrap magnets can be received from another system through the GBE system.

[0193] The GBE system uses the above steps 910 to 918 to process scrap magnets. In some embodiments, discarded magnets and recycled magnets can have similar properties to those described in Table 8 below. As described above, for each different discarded magnet, the amount and type of elements contained in the additive material can be adjusted to obtain a final magnet with the same properties. In some examples, 1 atomic% of Nd / Pr is added to the particles formed from each waste magnet.

[0194]

[0195] The remanence (Br) of the final magnet can be 1.25T. The coercivity (iHc) of the final magnet can be 1710 kA / m. The energy...

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Abstract

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for creating magnetic material. One of the methods includes melting magnetic elements to create a molten alloy, forming cast alloy flakes that comprise 2:14:1 phase grains, pulverizing the cast alloy flakes to create a first powder while maintaining at least some of the 2:14:1 phase grains, pressing and aligning particles in the first powder to create a first compact, sintering the first compact to create a sintered compact, fragmenting the sintered compact to form a second powder while maintaining at least some of the 2:14:1 phase grains from the sintered compact, mixing the second powder with a rare earth material and an elemental additive to produce a homogeneous powder while maintaining at least some of the 2:14:1 phase grains from the second powder, and sintering and magnetizing the homogeneous powder to form an Nd-Fe-B magnetic product.

Description

[0001] Cross references to related applications [0002] This application claims priority for U.S. Provisional Application 62 / 037,754 filed on August 15, 2014 and U.S. Non-Provisional Application 14 / 742,080 filed on June 17, 2015, the contents of which are incorporated herein by reference. Background technique [0003] The present disclosure relates to the use of grain boundary engineering (GBE) to implement the manufacture of rubidium-iron-boron (Nd-Fe-B) sintered magnets. [0004] The global market for rare earth permanent magnets (REPM) grows together with the scope of REPM applications. REPM shows high magnetic performance characteristics and is used to develop high-tech and high-efficiency applications in many industries including electronics, energy, transportation, aerospace, defense, medical devices, and information and communication technology. [0005] For example, applications that use Nd-Fe-B permanent magnets include: starting motors, anti-lock braking systems (ABS), fuel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/16B22F3/24B22F9/02B22F9/04B22F9/08C22C1/04C22C28/00C22C33/02C22C38/06C22C38/10C22C38/14C22C38/16H01F1/03H01F1/057H01F7/02H01F41/02B22F1/068
CPCB22F3/16B22F3/24B22F9/023B22F9/04B22F9/08C22C1/0441C22C28/00C22C33/0278C22C38/002C22C38/005C22C38/06C22C38/10C22C38/14C22C38/16H01F1/0306H01F1/0577H01F7/021H01F41/0266H01F41/0293B22F2998/10B22F2009/048C22C2202/02B22F1/068Y02P10/25
Inventor 米哈·扎科尼克卡塔利娜·瓦娜·图多尔皮特·阿菲尼沃尔特·德尔-波佐斯蒂芬·肯尼思·丹尼尔·达夫
Owner URBAN MINING CO
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