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Method for preparing Sm-Co based magnetic nano-material

A nano-magnetic material, sm-co technology, applied in the direction of nanotechnology, inorganic material magnetism, etc., can solve the problems of easy oxidation of Sm-Co phase, low chemical reduction potential, etc., and achieve environmental friendliness, low production cost, and easy operation Effect

Active Publication Date: 2014-02-19
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, due to Sm 3+ The chemical reduction potential in the liquid phase system is low, and the Sm-Co phase is easily oxidized. Therefore, the simple and easy preparation method of Sm-Co-based nanomagnetic materials with a core-shell structure has not been reported in detail.

Method used

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  • Method for preparing Sm-Co based magnetic nano-material
  • Method for preparing Sm-Co based magnetic nano-material
  • Method for preparing Sm-Co based magnetic nano-material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The first step, raw material preparation

[0038] The elemental composition of the nanomagnetic material prepared according to the requirements is SmCo 6.9 f 0.1 , take the pure Sm, pure Co and pure Hf of raw material proportioning mass by atomic ratio, and add the pure Sm that is 5% of the mass percentage of the above-mentioned pure Sm mass percentage again when actual batching, thus complete the raw material preparation;

[0039] The second step is to melt the raw materials to prepare master alloy ingots

[0040] Put all the raw materials prepared in the first step into the vacuum arc melting furnace for melting. When melting, first vacuumize the furnace body to 10 -2 Pa, the temperature of the furnace is raised above the melting point of the raw metal Co, until all the meltable raw materials are smelted evenly and all the raw materials are uniformly distributed, and then poured into the mold and cooled to room temperature, that is, the SmCo 6.9 f 0.1 master allo...

Embodiment 2

[0055] The first step, raw material preparation

[0056] The elemental composition of the nanomagnetic material prepared according to the requirements is SmCo 6.9 f 0.1 , take the pure Sm, pure Co and pure Hf of the mass ratio of the raw materials in atomic ratio, and add additional pure Sm which is 8% of the mass percentage of the above-mentioned pure Sm mass in the actual batching, thus completing the raw material preparation;

[0057] The second step is to melt the raw materials to prepare master alloy ingots

[0058] Put all the raw materials prepared in the first step into the vacuum arc melting furnace for melting. When melting, first vacuumize the furnace body to 10 -3 Pa, the temperature of the furnace is raised above the melting point of the raw metal Co, until all the meltable raw materials are smelted evenly and all the raw materials are uniformly distributed, and then poured into the mold and cooled to room temperature, that is, the SmCo 6.9 f 0.1 master alloy...

Embodiment 3

[0069] The first step, raw material preparation

[0070] The elemental composition of the nanomagnetic material prepared according to the requirements is SmCo 6.9 f 0.1 , take the pure Sm, pure Co and pure Hf of raw material proportioning mass by atomic ratio, add the pure Sm that is the mass percentage of above-mentioned pure Sm mass percentage 6.5% again when actual batching, complete raw material thus preparation;

[0071] The second step is to melt the raw materials to prepare master alloy ingots

[0072] Put all the raw materials prepared in the first step into the vacuum arc melting furnace for melting. When melting, first vacuumize the furnace body to 10 -2.5 Pa, the temperature of the furnace is raised above the melting point of the raw metal Co, until all the meltable raw materials are smelted evenly and all the raw materials are uniformly distributed, and then poured into the mold and cooled to room temperature, that is, the SmCo 6.9 f 0.1 master alloy ingot;

...

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Abstract

The invention discloses a method for preparing Sm-Co based magnetic nano-material and relates to a magnetic material containing rare earth metals and magnetic transition metals. The method for preparing the Sm-Co based magnetic nano-material combines physical methods and chemical methods in the following manner: hard magnetic SmCo6.9Hf0.1 nano-particles are obtained as a core in a ball-milling mode, the outer layers of the SmCo6.9Hf0.1 nano-particles are coated with soft magnetic elementary substance Co or Fe shells in combination with the polyol reduction method, and thus the Sm-Co based magnetic nano-material with the core-shell structure is prepared. Because the outer layer of the Sm-Co based magnetic nano-material is coated with the soft magnetic transition metal elementary substance shells, the Sm-Co based magnetic nano-material is prevented from being oxidized to a certain extent, and meanwhile possibility is provided for further pressing and sintering blocky materials with higher magnetic performance.

Description

technical field [0001] The technical scheme of the invention relates to magnetic materials containing rare earth metals and magnetic transition metals, in particular to a preparation method of Sm-Co-based nano magnetic materials. Background technique [0002] Sm-Co-based nano-magnetic materials have high coercivity and Curie temperature, and have been extensively studied in high-density storage media and permanent magnetic powders in recent years. However, since SmCo 5 Type and Sm 2 tm 17 The saturation magnetization of the hard magnetic material is much lower than that of the soft magnetic material, and its magnetic energy product does not increase much. In 1991, Kneller et al. (Kneller E.F., Hawig R.. The exchange-spring magnet: a new material principle for permanent magnets [J]. IEEE Transactions on Magnetic, 1991, 27, 3588-3600.) based on the theory of exchange coupling , expounding the possibility of obtaining materials with both high remanence ratio and high energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/04B82Y40/00H01F1/01
Inventor 孙继兵何辰辉步绍静崔春翔韩瑞平
Owner HEBEI UNIV OF TECH
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