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Magnetostrictive composite material for guided wave detection and its preparation method and application

A magnetostrictive and composite material technology, applied in the field of materials, can solve the problems of low resistivity and excessive hardness and brittleness, and achieve the effect of increasing resistivity, reducing production costs, and overcoming the inability to be used for higher frequencies.

Active Publication Date: 2021-10-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a magnetostrictive composite material with improved performance for guided wave detection and its preparation method in view of the problems that the magnetostrictive materials used in guided wave detection are too hard and brittle and have low resistivity. and application

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  • Magnetostrictive composite material for guided wave detection and its preparation method and application
  • Magnetostrictive composite material for guided wave detection and its preparation method and application
  • Magnetostrictive composite material for guided wave detection and its preparation method and application

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preparation example Construction

[0041] The embodiment of the present application also provides a preparation method of the magnetostrictive composite material, comprising the following steps:

[0042] uniformly mixing the terbium-dysprosium-iron alloy powder, the epoxy resin and the dispersant to form a premix;

[0043] The curing agent is kept separate from the premix.

[0044] The magnetostrictive composite material in this embodiment is actually a two-component material, including a curing agent and a premix. When using the magnetostrictive composite material for guided wave flaw detection, the curing agent and the premixture can be mixed in real time, and the mixture is loaded on the surface of the device to be tested to form a cured magnetostrictive composite material for guided wave detection.

[0045] In some embodiments, the composition of the magnetostrictive composite material also includes polydimethylsiloxane and / or rigidity modifier, and polydimethylsiloxane and / or rigidity modifier can be unif...

Embodiment 1

[0058] Alloy components of pure metal iron, terbium and dysprosium with a purity of 99.99% are put into the copper crucible from bottom to top according to the proportion of each component and melting point from high to low. Close the oven door and apply a vacuum. When the vacuum reaches 2×10 -3 At Pa, turn on the magnetic field current source to carry out magnetic levitation melting. The initial current is 40A, and the applied current increases from low to high, and increases by 20A until the metal is completely melted, showing a state of suspension melting, and the current is between 120-160A. The molten state lasts for 2-3 minutes, turn off the magnetic levitation current, and after the alloy is cooled by water, turn the alloy ingot over, and then continue to smelt as described above. After smelting 3 times, pour the liquid molten alloy. The prepared Tb 0.27 Dy 0.73 Fe 2 The alloy is mechanically crushed + jet mill + sand mill (ball mill) to obtain Tb with a particle s...

Embodiment 2

[0061] Alloy components of pure metal iron, terbium and dysprosium with a purity of 99.99% are put into the copper crucible from bottom to top according to the proportion of each component and melting point from high to low. Close the oven door and apply a vacuum. When the vacuum reaches 2×10 -3 At Pa, turn on the magnetic field current source to carry out magnetic levitation melting. The initial current is 40A, and the applied current increases from low to high, and increases by 20A until the metal is completely melted, showing a state of suspension melting, and the current is between 120-160A. The molten state lasts for 2-3 minutes, turn off the magnetic levitation current, and after the alloy is cooled by water, turn the alloy ingot over, and then continue to smelt as described above. After smelting 3 times, pour the liquid molten alloy. The prepared Tb 0.3 Dy 0.7 Fe 1.8 The alloy is prepared by gas atomization. The alloy is heated to 150-200 degrees Celsius above the ...

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Abstract

The application discloses a magnetostrictive composite material for guided wave detection, which comprises the following components in parts by weight: 35-60 parts of terbium-dysprosium-iron alloy powder, 20-30 parts of epoxy resin, dispersant, and curing agent , The curing agent is placed separately from other components and mixed at the time of use. The present application also discloses a preparation method of the magnetostrictive composite material, comprising the following steps: uniformly mixing the terbium-dysprosium-iron alloy powder, the epoxy resin and the dispersant to form a premix; The curing agent is placed separately from the premix. The application also discloses an application of the magnetostrictive composite material in guided wave flaw detection.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a magnetostrictive composite material used for guided wave detection and its preparation method and application. Background technique [0002] The guided wave detection technology based on magnetostrictive materials is a new type of nondestructive testing (flaw detection) technology developed in recent years. The guided wave has the characteristics of small attenuation, long propagation distance, and 100% coverage of the thickness of the component, so that the guided wave detection technology can achieve single-ended excitation, long-distance detection and continuous monitoring of complex structures and service environment facilities, thereby greatly improving detection efficiency. , has the potential as a technical means for on-line monitoring of component 'health'. [0003] At present, the magnetostrictive material used in guided wave detection is thin strip rolled by Ni or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C33/04B22F9/04B22F9/08
CPCB22F9/04B22F9/082B22F2009/043B22F2009/0824B22F2009/0848C22C33/04C22C38/005
Inventor 刘源周灿旭陈祥
Owner TSINGHUA UNIV
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