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Alloy material CoMnSi with room-temperature giant magnetostrictive effect and preparation of alloy material CoMnSi

A technology of giant magnetostriction and alloy materials, applied in the direction of material selection for magnetostrictive devices, device material selection, etc., can solve the problems of elastic energy loss, metal fragility, magnetostriction reduction, etc., to achieve no The effect of hysteresis

Inactive Publication Date: 2015-04-08
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The elastic energy will be lost on the cracks in the process of transmission, resulting in the reduction of magnetostriction, and the metal full of cracks is brittle, which is not conducive to actual processing and application

Method used

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  • Alloy material CoMnSi with room-temperature giant magnetostrictive effect and preparation of alloy material CoMnSi
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  • Alloy material CoMnSi with room-temperature giant magnetostrictive effect and preparation of alloy material CoMnSi

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Embodiment Construction

[0023] A kind of alloy material CoMnSi with room temperature magnetostrictive effect 1-x It can be composed of three elements: cobalt (Co), manganese (Mn) and silicon (Si), and the molecular formula is CoMnSi 1-x (x=0-0.02, such as 0; 0.01; 0.02).

[0024] Its preparation method is:

[0025] 1) According to the molecular formula of the alloy, the corresponding elements Co (59g), Mn (55g) and Si (27.44-28g are all acceptable) are precisely proportioned according to the molar ratio, and smelted into an alloy ingot.

[0026] 2) The alloy ingot is made into a small block with a size of about 0.5 cm, and the small block is vacuum-sealed in a quartz tube.

[0027] 3) Seal the sealed quartz tube into a larger-diameter quartz tube to form a double-layer tube.

[0028] 4) Burn the above-mentioned double-layer tube to 1250°C, then cool it to 850°C (degrees Celsius) under a 6T external field, and then remove the magnetic field to cool down naturally.

[0029] 5) The alloy obtained in...

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Abstract

The invention discloses an alloy material CoMnSi with a room-temperature giant magnetostrictive effect. The alloy material CoMnSi is prepared from the following three elements: cobalt (Co), manganese (Mn) and silicon (Si); the molecular formula is CoMnSi[1-x] (x=0-0.02). A sample is compact and free of a crack, and has a magnetic field-induced variable magnetic phase change; the prepared alloy has a <111> direction orientation texture parallel to a magnetic field; the variable magnetic phase close to the room temperature is free of hysteresis, and has a giant magnetostrictive effect at the room temperature; and the absolute value is greater than 1,000ppm. Through the preparation method, the variable magnetic critical field of the CoMnSi alloy is obviously reduced.

Description

technical field [0001] The invention relates to an alloy material CoMnSi with room temperature giant magnetostrictive effect 1-x (especially x=0-0.02) and preparation method thereof technical background [0002] Magnetostrictive materials have high application value and can be used as high-precision devices such as sensors and inductors. The most famous magnetostrictive material is Terfenol-D. (The magnetostriction of polycrystalline Terfenol-D at room temperature is about 1800 ppm.) However, Terfenol-D contains expensive rare earth elements, which increases its production cost and is not sustainable. Therefore, the research focus is on finding other inexpensive materials with magnetostrictive effects similar to Terfenol-D. The current study found that magnetic field-induced magnetic phase transitions may be accompanied by considerable magnetostrictive effects. In NiMn-based ferromagnetic shape memory alloys (NiMnIn, NiMnSn, NiMnSb), the magnetic field-induced phase tran...

Claims

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Application Information

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IPC IPC(8): C22C19/07C22C30/00C22C1/02H01L41/20
Inventor 王敦辉龚元元
Owner NANJING UNIV