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Process for producing Sm-Fe-N alloy powder

A technology of alloy powder and manufacturing method, which is applied in the direction of chemical instruments and methods, nitrogen compounds, non-metallic elements, etc., can solve the problem of low filling rate of bonded magnets, limitation of magnet powder ratio, poor degree of neat arrangement and poor orientation, etc. question

Inactive Publication Date: 2005-05-25
NICHIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When the particles of the magnet are small, the filling rate of the bonded magnet is very low, which limits the proportion of the magnet powder in the formed object
In addition, when such a bonded magnet is subjected to magnetic field orientation, if the shape of the fine particles is distorted after crushing, it is difficult to align the fine particles of the magnet powder in the direction of easy magnetization in the magnetic field, and there is a problem of alignment. Questions of Poor Degree and Orientation

Method used

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  • Process for producing Sm-Fe-N alloy powder
  • Process for producing Sm-Fe-N alloy powder
  • Process for producing Sm-Fe-N alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] 1. Precipitation reaction

[0098] Add 30 liters of pure water to the reaction tank, which added 520g of 97% H 2 SO 4 , dissolved 484.8 g of Sm 2 o 3 , and then add 25% ammonia water to roughly adjust the pH value to neutral. Add 5200g of FeSO to this aqueous solution 4 ·7H 2 O, make it dissolve completely and become a metal solution.

[0099] Add 12 liters of pure water in another tank, mix the 25% ammoniacal liquor of 2524g of ammonium bicarbonate and 1738g in water, be modulated into ammonia carbonate solution. While stirring the reaction tank, slowly add the above-mentioned ammonium carbonate solution to the metal solution, and then add ammonia water, so that the final pH value after all the addition is 8.0±0.5. After the agitation stops, the solution is allowed to stand in the tank, allowing the product to settle to the bottom of the container. When a part of the precipitate obtained at this time was taken out and observed under a microscope, all the partic...

Embodiment 2

[0115] 1. Co-precipitation

[0116] Weigh the nitric acid of 513.4g to be enough for the hydrate Sm(NO 3 ) 3 ·6H 2 O and 3432.3g of iron nitrate 9 water hydrate Fe(NO 3 ) 3 9H 2 O, both are dropped into 10 liters of ion-exchanged water together, and stir simultaneously. After confirming to dissolve completely, continue to stir, add the urea (NH2) of 2992.5g simultaneously 2 ) 2 CO, then, while continuing to stir, the liquid temperature was raised to 80 °C. At this time, urea is decomposed into ammonia gas and carbon dioxide gas due to the addition of water, and the metal-containing material is precipitated due to uniform reaction.

[0117] 2. Filter and wash

[0118] The resultant was placed on filter paper, and particle-exchanged water was poured over the filter paper to pass through the filter paper. This operation is not stopped until the specific resistance of the filtrate is lower than 50μs / m. The washed product cake was dried in a dryer at 80°C.

[0119] 3. F...

Embodiment 3

[0132] The average particle size of 1.5 microns, the iron oxide (Fe 2 o 3 ) powder 135.7g, average particle size 1.0 micron, samarium oxide powder (Sm 2 o 3 ) 34.9g, mixed with water with a ball mill and pulverized for 2 hours. The iron oxide powder and samarium oxide powder used in this example are the same materials as in Example 1. After the obtained slurry is dehydrated, the solid matter is separated, and the dried solid matter is crushed with a sample pulverizer to obtain a mixed powder. The obtained mixed powder was put into a pan made of mild steel, and then put into a furnace for preliminary reduction in a hydrogen stream at 600°C. During the reduction process, the flow rate of hydrogen was 2 liters / minute, and the duration was 5 hours.

[0133] The oxygen analysis result of the reduced powder showed that the oxygen element removal rate of the iron oxide component was 89.5%. However, under such conditions, samarium oxide was not reduced by hydrogen. Add 44.5 g o...

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Abstract

In the manufacturing method of magnetic powder of Sm-Fe-N series alloy of the present invention, the mixture of Sm-Fe and oxide is obtained by means of co-precipitation method to obtain precipitates such as hydroxide compounds, and then fired. . The mixture of oxides is then mixed with metallic calcium, heated, diffused and reduced to obtain Sm-Fe alloy powder. Then, place it in the furnace as it is, and carry out nitriding treatment in an atmosphere of nitrogen element to obtain Sm-Fe-N series magnetic powder with the above-mentioned average particle size and average acicularity. Mix this magnetic powder in resin and make it into a certain shape, which can be used as a bonded magnet.

Description

technical field [0001] The present invention relates to the manufacturing method of Sm in rare earth element, Fe in transition metal, and nitrogen element series alloy powder, especially relates to the manufacturing method of a series of alloy powder with spherical particle shape and excellent magnetic properties. Background technique [0002] Rare-earth-transition metal series magnetic materials are in great demand in recent years because of their excellent magnetic properties, although their prices are very high compared with ferrite and other materials. Among them, the magnetic properties of Nd series magnets are higher than those of Sm series magnets, and the price is also cheap, so they have become the mainstream of rare earth magnets. [0003] An R-Fe-N series alloy obtained by nitriding an R-Fe series alloy among rare earth-transition metal series magnetic materials is known. This kind of magnet has the following excellent characteristics: the Curie point can reach a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00B22F9/20C01B21/06C22C32/00H01F1/053H01F1/059
CPCB22F9/20C01B21/0602C01P2004/10C01P2004/11C01P2004/32C01P2004/61C01P2004/62C01P2006/42C22C32/0068H01F1/059H01F1/0596
Inventor 河野芳之久米道也一宫敬治
Owner NICHIA CORP
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