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Method for preparing SmCo7 permanent-magnetic alloy with particle size smaller than 20nm

A technology of permanent magnetic alloy and particle size, which is applied in the direction of magnetism of inorganic materials, can solve the problems of using SmCo alloy, etc., and achieve the effects of excellent magnetic properties, enhanced exchange coupling, and low cost

Inactive Publication Date: 2007-10-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two methods have not been used for SmCo alloys

Method used

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  • Method for preparing SmCo7 permanent-magnetic alloy with particle size smaller than 20nm
  • Method for preparing SmCo7 permanent-magnetic alloy with particle size smaller than 20nm
  • Method for preparing SmCo7 permanent-magnetic alloy with particle size smaller than 20nm

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Experimental program
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Effect test

Embodiment 1

[0020] (A), the alloy elements Sm, Co, Fe, Cu, Zr with a purity greater than 99.9% are divided into Sm (Co bal Fe 0.1 Cu 0.16 Zr 0.04 ) 6.7 After the ratio is prepared, put it in the medium frequency induction furnace and vacuumize it to 10 -3 Pa above, and then pass high-purity argon for smelting, in order to ensure the uniformity of the alloy composition, remelt twice during the alloy smelting process;

[0021] (B) Put the coarsely broken alloy ingot after smelting into a quartz tube with a nozzle at the bottom, then place the quartz tube in the center of the induction coil in the cavity of the belt throwing machine, vacuumize, and under the protection of argon, make the mother Alloy induction melting;

[0022] (C), under the action of argon pressure, the alloy melt is sprayed onto the surface of the high-speed rotating copper roller through the nozzle at the bottom of the quartz tube to form an amorphous alloy strip, and the speed of the copper roller surface can be co...

Embodiment 2

[0026] (A), the alloy elements Sm, Co, Fe, Cu, Zr with a purity greater than 99.9% are divided into Sm (Co bal Fe 0.1 Cu 0.16 Zr 0.04 ) 6.7 After the ratio is prepared, put it in the medium frequency induction furnace and vacuumize it to 10 -3 Pa above, and then pass high-purity argon for smelting, in order to ensure the uniformity of the alloy composition, remelt twice during the alloy smelting process;

[0027] (B) Put the coarsely broken alloy ingot after smelting into a quartz tube with a nozzle at the bottom, then place the quartz tube in the center of the induction coil in the cavity of the belt throwing machine, vacuumize, and under the protection of argon, make the mother Alloy induction melting;

[0028] (C), under the action of argon pressure, the alloy melt is sprayed onto the surface of the high-speed rotating copper roller through the nozzle at the bottom of the quartz tube to form an amorphous alloy strip, and the speed of the copper roller surface can be co...

Embodiment 3

[0032] (A), the alloy elements Sm, Co, Fe, Cu, Zr with a purity greater than 99.9% are divided into Sm (Co bal Fe 0.197 Cu 0.049 Zr 0.024 ) 7.5 After the ratio is prepared, put it in the medium frequency induction furnace and vacuumize it to 10 -3 Pa above, and then pass high-purity argon for smelting, in order to ensure the uniformity of the alloy composition, remelt twice during the alloy smelting process;

[0033] (B) Put the coarsely broken alloy ingot after smelting into a quartz tube with a nozzle at the bottom, then place the quartz tube in the center of the induction coil in the cavity of the belt throwing machine, vacuumize, and under the protection of argon, make the mother Alloy induction melting;

[0034] (C), under the action of argon pressure, the alloy melt is sprayed onto the surface of the high-speed rotating copper roller through the nozzle at the bottom of the quartz tube to form an amorphous alloy strip, and the speed of the copper roller surface can b...

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Abstract

The invention discloses a preparing method of SmCo7 permanent magnet alloy whose grain size is smaller than 20nm, the RE, Co, Fe, Cu, T whose fineness is bigger than 99. 9% is mixed together just as proportion of RE(CobalFexCuyTw)z and placed in the induction furnace, the alloy ingoting which is after the fusion is cased into the quartz tube equipped with nozzle at the bottom to be melt, ejected to the surface of copper roller which is tail-wagging via the nozzle at the bottom of the quartz tube to form amorphous state alloy belt, the film belt obtained is airproofed in the quartz tube, then it is placed to the microwave welding furnace for crystal process, the temperature and time range of crystal process in the microwave welding furnace is 400-900deg.C and 10min-180min, then it is placed into water for cooling. The craftwork of the invention is simple, the cost is low, the grain size of nanometer crystal magnet which includes SmCo7 main phase is about 20nm, and it is lower than grain size obtained by general heat treatment method, the exchange coupled function between grains is increased greatly.

Description

technical field [0001] The present invention relates to a kind of preparation method of permanent magnetic alloy, especially relate to a kind of SmCo with particle size less than 20nm 7 Preparation method of permanent magnetic alloy. Background technique [0002] SmCo 7 Due to its good intrinsic magnetic properties and potential application value in high temperature field, it has attracted people's interest, and has gradually become a research hotspot in the field of permanent magnet materials in recent years. SmCo 7 The intrinsic magnetic properties of SmCo 5 and Sm 2 co 17 between. Its saturation magnetization is stronger than that of SmCo 5 high, the anisotropy field is Sm 2 co 17 1.2-1.4 times that of Zr, the anisotropy field will further increase after adding elements such as Zr. However, the addition of Zr, Ti, Cu, etc. reduces the SmCo 7 phase saturation magnetization. Replacing part of Co with Fe can increase SmCo 7 phase saturation magnetization. Can r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/06C22C1/03
Inventor 李丽娅易健宏葛毅成彭元东
Owner CENT SOUTH UNIV
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