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A kind of preparation method of porous mn-al-c ferromagnetic shape memory alloy

A memory alloy and ferromagnetic technology, which is applied in the direction of magnetic objects, magnetic materials, and inorganic materials, can solve the problems of insufficient strain output, difficulty in control, poor shape memory performance of Mn-based bulk alloys, etc., and achieve low cost, The effect of simple equipment, reducing the difficulty and cost of preparation

Active Publication Date: 2020-11-17
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the defects that the shape memory performance of Mn-based bulk alloy is poor, the strain output is not large enough and difficult to control, the purpose of the present invention is to provide a preparation method of porous Mn-Al-C ferromagnetic shape memory alloy, to provide Preparation method of Mn-based ferromagnetic shape memory alloy with simple process, uniform composition, controllable porosity and pore structure

Method used

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  • A kind of preparation method of porous mn-al-c ferromagnetic shape memory alloy

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Experimental program
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Effect test

Embodiment 1

[0030] (1) Take by weighing 10.875g manganese powder, 4.05g aluminum powder, 0.075g carbon powder and 0.1g urea, mix four kinds of powders;

[0031] (2) Put the powder obtained in step (1) into a mortar and mix evenly, then add an appropriate amount of alcohol dropwise until the alcohol is just submerged in the mixed powder, then use a dropper to add alcohol drop by drop, and stir while adding, so that When it forms a relatively uniform solid-liquid mixture, stop the dripping, and do not form a large amount of alcohol suspension;

[0032](3) Put the solid-liquid mixture obtained in step (2) into a corundum boat, wherein the solid-liquid mixture and the left and right sides of the corundum boat retain some gaps, and then put them together into a tubular resistance furnace, and pass in argon to carry out Inert atmosphere protection;

[0033] (4) The temperature control program for setting up the tube furnace is as follows: evenly heat up from room temperature to 1100°C, and kee...

Embodiment 2

[0035] (1) Take by weighing 10.05g manganese powder, 4.80g aluminum powder, 0.15g carbon powder and 0.1 urea, and mix the four kinds of powders evenly;

[0036] (2) Put the powder obtained in step (1) into a mortar and mix evenly, then add an appropriate amount of alcohol dropwise until the alcohol is just submerged in the mixed powder, then use a dropper to add alcohol drop by drop, and stir while adding, so that When it forms a relatively uniform solid-liquid mixture, stop the dripping, and do not form a large amount of alcohol suspension;

[0037] (3) Put the solid-liquid mixture obtained in step (2) into a corundum boat, wherein the solid-liquid mixture and the left and right sides of the corundum boat retain some gaps, and then put them together into a tubular resistance furnace, and pass in argon to carry out Inert atmosphere protection;

[0038] (4) The temperature control program for setting up the tube furnace is as follows: uniformly rise from room temperature to 11...

Embodiment 3

[0040] (1) Take by weighing 10.125g manganese powder, 4.80g aluminum powder, 0.075g carbon powder and 0.1g urea, mix four kinds of powders;

[0041] (2) Put the powder obtained in step (1) into a mortar and mix evenly, then add an appropriate amount of alcohol dropwise until the alcohol is just submerged in the mixed powder, then use a dropper to add alcohol drop by drop, and stir while adding, so that When it forms a relatively uniform solid-liquid mixture, stop the dripping, and do not form a large amount of alcohol suspension;

[0042] (3) Put the solid-liquid mixture obtained in step (2) into a corundum boat, wherein the solid-liquid mixture and the left and right sides of the corundum boat retain some gaps, and then put them together into a tubular resistance furnace, and pass in argon to carry out Inert atmosphere protection;

[0043] (4) The temperature control program for setting the tube furnace is as follows: uniformly rise from room temperature to 1050°C, and keep ...

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Abstract

The invention provides a preparation method of a porous Mn-Al-C ferromagnetic shape memory alloy. The preparation method of the porous Mn-Al-C ferromagnetic shape memory alloy comprises the followingsteps that S1, Mn powder, Al powder and C powder are mixed with a pore-forming agent to obtain mixed powder, and the mixed powder is mixed with alcohol to obtain a uniform solid-liquid mixture; and S2, the solid-liquid mixture is placed in a crucible to be sintered under a protective atmosphere and is then cooled to remove an oxide layer on the surface, so that the porous Mn-Al-C ferromagnetic shape memory alloy is prepared. According to the preparation method of the porous Mn-Al-C ferromagnetic shape memory alloy, equipment used for preparation is simple, the preparation process is simple, the cost is low, and the error-tolerant rate is high, so that the preparation difficulty and cost of Mn-matrix shape memory alloys are effectively reduced; and meanwhile, the alloy prepared through themethod has the characteristic of large size of bulk alloys and the characteristic of relative large strain output of porous alloys, and the magnetic-induced strain of the alloy can be effectively regulated by adjusting the porosity.

Description

technical field [0001] The invention relates to the technical field of magnetically induced strain shape memory alloys, in particular to a preparation method of porous Mn-Al-C ferromagnetic shape memory alloys. Background technique [0002] Mn-based ferromagnetic memory alloys have attracted attention due to their one-way / two-way memory effects, magnetron memory effects and good damping properties, but their strain output, especially the magnetron strain, is still very small (<2%), which greatly limits industrial applications of such alloys. At present, there is very little research on manganese-based porous alloys at home and abroad, especially the research on its magnetic control memory effect, but this is very important for its industrial application. Because the change control of the external magnetic field is more controllable and maneuverable than the change control of the temperature, it can make the use of materials more flexible and wider, and effectively make u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C22/00H01F1/03
CPCB22F3/1121C22C22/00C22C2202/02H01F1/0308
Inventor 吕步垚万见峰崔书山
Owner SHANGHAI JIAOTONG UNIV