Method for preparing nano composite permanent magnet material by adding zirconium into magnetic steel waste

A permanent magnetic material and nanocomposite technology, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of the difficulty in controlling the scale and composition of two phases, the difficulty in increasing the maximum magnetic energy product of isotropic nanomaterials, and the difficulty in Precisely control the grain size and distribution of hard magnetic phase and soft magnetic phase to achieve the effect of changing grain microstructure and magnetic properties, low rare earth content, and saving time

Inactive Publication Date: 2016-01-20
SUZHOU SABO IND DESIGN
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Problems solved by technology

However, although these methods can also adjust the microstructure of the composite material, it is difficult to precisely control the grain size and distribution of the hard magneti...
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Abstract

The invention relates to a method for preparing a nano composite permanent magnet material by adding zirconium into magnetic steel waste. Collected waste magnetic steel is presorted according to the classification standard that the waste magnetic steel which is in the same batch and model and is provided with same rare earth elements is classified as one class, and a pre-processed magnet material is obtained; the obtained pre-processed magnet material is directly subjected to hydrogen decrepition pulverizing, and rare earth hydrogen decrepition magnetic powder is obtained; sampling analysis is carried out on the rare earth hydrogen decrepition magnetic powder, and the zirconium is added into the rare earth hydrogen decrepition magnetic powder according to needs to obtain mixed powder; and finally through static pressing, sintering and annealing, the needed nano composite permanent magnet material is prepared. The problem of segregation, caused by factors such as different smelting pints of all compositions and the like, generated by an alloy ingot obtained after smelting can be effectively solved; and through presorting, the time for recovering the waste magnetic steel can be saved, and the process step of extraction is omitted. The zirconium is added into the rare earth hydrogen decrepition magnetic powder, the grain microstructure and the magnetic performance of the nano composite permanent magnet material can be changed, and grain refinement is promoted; and the nano composite permanent magnet material obtained through a precipitation separation method is high in performance and low in rare earth content.

Application Domain

Magnetic materials

Technology Topic

Rare-earth elementScrap +10

Examples

  • Experimental program(5)

Example Embodiment

[0027] Example 1
[0028] component
[0029] A nano-composite permanent magnetic material is batched according to the following table 1-1:
[0030] Table 1-1 Example 1 formula table
[0031] The preparation method of the above-mentioned nanocomposite permanent magnetic material of the present embodiment is as follows:
[0032] The collected waste magnetic steel is pre-classified according to the classification standard of the same batch and the same type of waste magnetic steel containing the same rare earth elements, and the magnet material is pretreated; then according to the prepared nanocomposite permanent magnetic material, the obtained The pretreated magnet material is directly subjected to hydrogen crushing and powdering to obtain rare earth hydrogen crushed magnetic powder; at the same time, the obtained rare earth hydrogen crushed magnetic powder is sampled and analyzed to obtain the composition parameters of rare earth magnetic powder, and then according to the composition parameters of rare earth magnetic powder obtained by analysis, in the obtained The rare earth hydrogen crushed magnetic powder is added with zirconium to obtain mixed powder, and finally the obtained mixed powder is crushed into fine powder by hydrogen crushing and jet mill, and a certain amount of air is put into the jet mill for passivation. The powder is mixed and stirred, the average particle size of the fine powder is 2.4 μm, and the fine powder is pressed into a compact by molding and isostatic pressing in turn, and the isostatic pressing pressure is 230MPa, and the compact density is 4.3g/cm 3; After all the fine powders are pressed, use the precipitation separation method to remove the remaining metal nanoparticles in the compaction reaction, and wash the compaction in deionized water for 3 to 5 times, ultrasonically oscillate, and then vacuum dry to obtain nano-permanent permanent magnet material blanks Then, the nano permanent magnet material body was sintered in a vacuum sintering furnace, the sintering temperature was 1070 ° C, and the temperature was kept for 200 minutes; then the sintered compact was cooled to 300 ° C in the vacuum sintering furnace, and then heated to 200 ° C. 900 ℃ and hold for 90 minutes, then cool down to 300 ℃ again, and heat up to 530 ℃ and hold for 200 minutes to obtain the nanocomposite permanent magnetic material; its performance test data is shown in Table 1-2.
[0033] Among them, Br is the remanence, Hcb is the coercive force, (B.H)max is the magnetic energy product, and MPa is the bending strength.
[0034] Table 1-2 Example 1 Product Performance Test Table
[0035] project

Example Embodiment

[0036] Example 2
[0037] A nano-composite permanent magnetic material is batched according to the following table 2-1:
[0038] Table 2-1 Example 2 formula table
[0039] component
[0040] The preparation method of the above-mentioned nanocomposite permanent magnetic material of the present embodiment is as follows:
[0041]The collected waste magnetic steel is pre-classified according to the classification standard of the same batch and the same type of waste magnetic steel containing the same rare earth elements, and the magnet material is pretreated; then according to the prepared nanocomposite permanent magnetic material, the obtained The pretreated magnet material is directly subjected to hydrogen crushing and powdering to obtain rare earth hydrogen crushed magnetic powder; at the same time, the obtained rare earth hydrogen crushed magnetic powder is sampled and analyzed to obtain the composition parameters of rare earth magnetic powder, and then according to the composition parameters of rare earth magnetic powder obtained by analysis, in the obtained The rare earth hydrogen crushed magnetic powder is added with zirconium to obtain mixed powder, and finally the obtained mixed powder is crushed into fine powder by hydrogen crushing and jet mill, and a certain amount of air is put into the jet mill for passivation. The powder is mixed and stirred, and the average particle size of the fine powder is 2.5 μm; the fine powder is sequentially pressed into a compact by molding and isostatic pressing, and the isostatic pressing pressure is 240MPa, and the compact density is 4.4g/cm 3; After all the fine powders are pressed, use the precipitation separation method to remove the remaining metal nanoparticles in the compaction reaction, and wash the compaction in deionized water for 3 to 5 times, ultrasonically oscillate, and then vacuum dry to obtain nano-permanent permanent magnet material blanks Then, the nano permanent magnet material body was sintered in a vacuum sintering furnace, the sintering temperature was 1080 ° C, and the temperature was kept for 200 minutes; then the sintered compact was cooled to 310 ° C in the vacuum sintering furnace, and then heated to 200 ° C. 900°C and kept for 90 minutes, then cooled to 310°C again, heated to 550°C and kept for 200 minutes, the nanocomposite permanent magnetic material was obtained; its performance test data are shown in Table 2-2.
[0042] Table 2-2 Example 2 Product Performance Test Table
[0043] project

Example Embodiment

[0044] Example 3
[0045] A nano-composite permanent magnetic material is batched according to the following table 3-1:
[0046] Table 3-1 Example 3 formula table
[0047] component
[0048] The preparation method of the above-mentioned nanocomposite permanent magnetic material of the present embodiment is as follows:
[0049] The collected waste magnetic steel is pre-classified according to the classification standard of the same batch and the same type of waste magnetic steel containing the same rare earth elements, and the magnet material is pretreated; then according to the prepared nanocomposite permanent magnetic material, the obtained The pretreated magnet material is directly subjected to hydrogen crushing and powdering to obtain rare earth hydrogen crushed magnetic powder; at the same time, the obtained rare earth hydrogen crushed magnetic powder is sampled and analyzed to obtain the composition parameters of rare earth magnetic powder, and then according to the composition parameters of rare earth magnetic powder obtained by analysis, in the obtained The rare earth hydrogen crushed magnetic powder is added with zirconium to obtain mixed powder, and finally the obtained mixed powder is crushed into fine powder by hydrogen crushing and jet mill, and a certain amount of air is put into the jet mill for passivation. The powder is mixed and stirred, and the average particle size of the fine powder is 2.6 μm; the fine powder is sequentially pressed into a compact by molding and isostatic pressing, and the isostatic pressing pressure is 250MPa, and the compact density is 4.4g/cm 3; After all the fine powders are pressed, use the precipitation separation method to remove the remaining metal nanoparticles in the compaction reaction, and wash the compaction in deionized water for 3 to 5 times, ultrasonically oscillate, and then vacuum dry to obtain nano-permanent permanent magnet material blanks Then, the nano permanent magnet material body was sintered in a vacuum sintering furnace, the sintering temperature was 1085 ° C, and the temperature was kept for 200 minutes; then the sintered compact was cooled to 320 ° C in the vacuum sintering furnace, and then heated to 200 ° C. 910°C and kept for 90 minutes, then cooled to 320°C again, heated to 570°C and kept for 200 minutes, the nanocomposite permanent magnetic material was obtained; its performance test data are shown in Table 3-2.
[0050] Table 3-2 Example 3 Product Performance Test Table
[0051] project

PUM

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