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Method for observing magnetic domain structure of heat-resisting Nd-Fe-B magnet

A technology of NdFeB and magnetic domains, which is applied in the field of observing the magnetic domain structure of heat-resistant NdFeB magnets, can solve problems such as complex magnetic domain structures, and achieve the effects of easy popularization and application, low cost, and high solution cost

Inactive Publication Date: 2007-05-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Electron holography is a two-step imaging process: the first step is recording, which is carried out in an electron microscope, that is, the sample is illuminated with an electron beam, and the electron beam diffracted by the sample interferes with the reference beam and is recorded on the film; The second step is reconstruction, which usually uses coherent visible light to illuminate the hologram to obtain the optically reproduced wavefront of the original object wave, and then extracts the amplitude and phase information. It can be seen that the observation of the magnetic domain structure by electron holography is also more complicated

Method used

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  • Method for observing magnetic domain structure of heat-resisting Nd-Fe-B magnet

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Embodiment 1

[0022] 2.0g FeCl 2 4H 2 O and 5.3 g FeCl 3 ·6H 2 O was added to distilled water and stirred evenly to form a 280ml solution. Then slowly drop 60ml of NaOH solution with a mass concentration of 10% into the above solution, and stir and filter at 30°C, heat water in the obtained precipitate, stir and filter again, and repeat the filter several times, each time changing New filter paper, get dark brown Fe 3 o 4powder. Add 1.8g of sodium oleate into distilled water, stir evenly, make a 50ml solution, and add an appropriate amount of HCl to make the pH of the solution 7, then add 19ml of Fe 3 o 4 Powder, stir evenly and add appropriate amount of distilled water to dilute to obtain water-based Fe 3 o 4 ferrofluid. Will be observed (Nd 21.6 Dy 4 PR 4 Tb 2 ) 31 Fe 65 (Co 0.96 Nb 0.2 Al 0.2 Cu 0.2 Ga 0.2 ) 2 The sample B is used as the positive electrode after being polished and mechanically polished, and a copper sheet with a larger area than the sample is used a...

Embodiment 2

[0024] 2.2g FeCl 2 4H 2 O and 5.6 g FeCl 3 ·6H 2 O was added to distilled water, and stirred evenly to form a 340ml solution. Then slowly drop 70ml of NaOH solution with a mass concentration of 10% into the above solution, and stir and filter at 40°C, heat water in the obtained precipitate, stir and filter again, and repeatedly filter several times, each time changing New filter paper, get dark brown Fe 3 o 4 powder. Add 2.1g of sodium oleate into distilled water, stir evenly, make a 60ml solution, and add an appropriate amount of HCl to make the pH of the solution 7, then add 22ml of Fe 3 o 4 Powder, stir evenly and add appropriate amount of distilled water to dilute to obtain water-based Fe 3 o 4 ferrofluid. Will be observed (Nd 17.6 Dy 5 PR 6 Tb 3 ) 31 Fe 66 (Co 1.36 Nb 0.1 Al 0.1 Cu 0.1 Ga 0.1 ) The B sample is used as the positive electrode after being polished and mechanically polished, and a copper sheet with a larger area than the sample is used as...

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Abstract

The invention relates to an observation method of domain structure of heat-proof neodymium-iron-boron magnet. The solution of NaOH is slowly instilled into the solution of FeCl2 and FeCl3, the solution is agitated and filtered to obtain the power of Fe3O4, the power of Fe3O4, sodium oleate and suitable HCl are added into the distilled water, the solution is agitated and diluted to obtain the hydromagnetic of Fe3O4; the sample to be measured is electro-polished in the electrolyte of CrO3 and 85 % phosphoric acid; The hydromagnetic of Fe3O4 is placed on the surface of sample on the electromagnet, and covers the coverglass. When the power is dried, the domain structure can be observed by microscope. The cost of the method in the invention is low, the operation is simple, and it is easy to spread for application.

Description

technical field [0001] The invention relates to a method for observing the magnetic domain structure of a heat-resistant NdFeB magnet, belonging to the technical field of magnetic materials. Background technique [0002] Heat-resistant NdFeB magnets have high magnetic properties and good temperature stability. In order to develop heat-resistant NdFeB magnets with higher operating temperatures and better magnetic properties, many researchers have systematically studied the relationship between intrinsic coercive force and abnormal changes in temperature from the perspective of microstructure, and deeply understood the composition and structure of materials. and the intrinsic link between magnetic properties. The magnetic properties and temperature stability of heat-resistant NdFeB magnets are closely related to its magnetic domain structure, so it is necessary to frequently observe the magnetic domain structure of heat-resistant NdFeB magnets in research. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12
Inventor 李士涛侯雪玲张岸张鹏倪建森徐晖
Owner SHANGHAI UNIV
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