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Intermetallic compound anisotropy magnetic powder, preparation method and special device

A compound and rare earth metal technology, which is applied in the coating process of metal materials, magnetic materials, magnetic objects, etc., can solve the problems of unstable performance of magnetic powder and inaccurate control of key parameters.

Active Publication Date: 2008-08-13
德清晶格磁电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 1995, Japan’s Mitsubishi Materials Corporation set up factories and sales representatives in the United States to produce and sell magnetic powder named HDDR, but the key parameters of the process could not be precisely controlled, making the performance of the prepared magnetic powder unstable. Finally, in 1999 year shutdown

Method used

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  • Intermetallic compound anisotropy magnetic powder, preparation method and special device
  • Intermetallic compound anisotropy magnetic powder, preparation method and special device
  • Intermetallic compound anisotropy magnetic powder, preparation method and special device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Laboratory measured component Nd 12.5 Fe 81.3 B 6.2 The correlation between alloy magnetism and hydrogen pressure during disproportionation is as follows: Figure 6 shown. The hydrogen pressure range corresponding to the magnetic front is 18±0.2kPa, and the pressure width is only 0.4kPa.

[0044] For the convenience of description, the atomic percent (at.%) of the chemical components in each example is converted into weight percent (wt.%). then component Nd 12.5 Fe 81.3 B 6.2 (at.%), converted into weight percentage (wt.%) is Nd 28.12 Fe 70.83 B 1.05 (wt.%) alloy. Adopt industrial pure iron, metal neodymium (purity is 99% by weight), B-Fe alloy (containing B 18wt.%). According to traditional preparation technique, make alloy ingot as the method that inventor's patent 98102766.0 introduces. Under vacuum or protective atmosphere at 1100°C, homogenization treatment is carried out for 20 hours, followed by hydrogenation-disproportionation-desorption-recombinatio...

Embodiment 2

[0055] By component Nd 12.5 Fe 80.6 B 6.4 Ga 0.3 Nb 0.2 (at.%) converted to wt.%, then: Fe 70.2 B 1.1 Ga 0.3 Nb 0.3 (wt.%), using industrial pure iron, metal neodymium (purity is 99% by weight), B-Fe alloy (containing B 18wt.%), Ga (purity is 99.9% by weight), Nb (purity is 98% percent by weight). According to traditional preparation technique, make alloy ingot as the method that inventor's patent 98102766.0 introduces. Homogenization treatment is carried out at 1100°C for 20 hours under vacuum or protective atmosphere, and then hydrogenation treatment can be carried out. The addition of Ga and Nb not only broadens the peak width range of (BH), making it easier to achieve anisotropy compared with the case without addition, in addition, its peak value is also higher than the case without addition. Component Nd 12.5 Fe 80.6 B 6.4 Ga 0.3 Nb 0.2 The correlation between alloy magnetism and hydrogen pressure during disproportionation is shown in Figure 7 . It is ...

Embodiment 3

[0066] The composition ratio and treatment process are the same as in Example 2, the only difference is that the hydrogen pressure range is reduced to 31.5±0.2kPa during the disproportionation of hydrotreatment, and the rest of the operations are the same as in Example 2. Nd treated above 28.1 Fe 70.2 B 1.1 Ga 0.3 Nb 0.3 (wt.%) alloy powder, its maximum energy product is: (BH) MAX =343kJ / m 3 = 43 MGOe.

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Abstract

The invention relates to a magnetic single-phase rare earth intermetallic and compoundpreparation process thereof, and to special equipment. The chemical formula of the magnetic powder is: R12.5-X1-X2SMX2TC81.3-Y1-Y2TMY2B6.2-Z, by atom percentage, wherein R is a rare earth element, Nd is an indispensable element, others are one or more selected from rare earth elements Pr, Ce, Tb and Dy, Nd accounts for 80 to 100% of the total of rare earth elements; SM are semiconductor element(s), one or more selected from Si, Ga and Ge; TC are ferromagnetic element(s), one or more selected from Fe or Co, Fe accounts for 87% to 100% of the ferromagnetic element(s); TM are transition metal element(s), one or more selected from Ti, Zr, Hf, Nb, Ta, V, Cr, Mo and W, the values of X1, X2, Y1, Y2 and Z are: -0.7<=X1<=0.7, 0.05<=X2<=1, -2<=Y1<=2, 0.05<=Y2<=0.5 and -0.3<=Z <=0.3, the BHMAX of the alloy is 16 to 43MGOe.

Description

technical field [0001] The invention relates to a single-phase rare earth intermetallic compound alloy, in particular to a rare earth intermetallic compound anisotropic magnetic powder and a preparation method thereof, as well as special equipment for implementing the process. Background technique [0002] Rare earth intermetallic compounds are the basis for preparing high-performance permanent magnets, which are widely used in various fields such as modern industrial technology, scientific research, and national defense and military affairs. Such as household appliances, industrial automation instruments, microwave communications, computers, motors, magnetic separation, magnetizers, medical equipment, magnetic machinery and cutting-edge scientific experiments, etc. In terms of household appliances, typical applications include high-fidelity audio components such as speakers, pickups, and receivers, as well as refrigerators, air conditioners, and washing machines. In terms ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00H01F1/055C22C38/12C22C33/02B22F1/00B22F9/00C23C8/08
Inventor 罗阳罗惇
Owner 德清晶格磁电科技有限公司