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A Method for Effectively Inhibiting the Precipitation of Second Phase in Ni-Mn-Sn-Fe Alloy

A technology of alloy and cylinder, which is applied in the field of Ni-Mn-Sn-Fe metal fiber preparation, can solve the problem of easy precipitation of the second phase, and achieve the effects of fast heat conduction, high solidification rate and fine grains

Active Publication Date: 2017-01-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem that the Ni-Mn-Sn-Fe alloy is easy to precipitate the second phase in the conventional cooling and solidification process, and provides a method for effectively inhibiting the precipitation of the second phase in the Ni-Mn-Sn-Fe alloy

Method used

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  • A Method for Effectively Inhibiting the Precipitation of Second Phase in Ni-Mn-Sn-Fe Alloy
  • A Method for Effectively Inhibiting the Precipitation of Second Phase in Ni-Mn-Sn-Fe Alloy
  • A Method for Effectively Inhibiting the Precipitation of Second Phase in Ni-Mn-Sn-Fe Alloy

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specific Embodiment approach 1

[0023] Specific Embodiment 1: The method for effectively suppressing the precipitation of the second phase of the Ni-Mn-Sn-Fe alloy in this embodiment is implemented according to the following steps:

[0024] 1. Seal the Ni-Mn-Sn-Fe alloy cylindrical ingot in a quartz glass tube, vacuumize it with a mechanical pump, keep it at a temperature of 900-950°C for 24-72 hours, and cool it to room temperature with the furnace to obtain the heat-treated For ingot casting, the heat-treated ingot is cut into multi-section small cylindrical ingots with a wire electric discharge machine. After the surface is polished and bright, it is put into water for ultrasonic cleaning, and dried to obtain the cleaned alloy cylindrical ingot;

[0025] 2. Put the cleaned alloy cylindrical ingot into the alumina hollow cylinder, and then put it into the electromagnetic induction heating coil in the working room of the melt drawing equipment. The axis of the alumina hollow cylinder is perpendicular to the ...

specific Embodiment approach 2

[0031] Specific embodiment two: the difference between this embodiment and specific embodiment one is that step one uses a mechanical pump to evacuate until the air pressure is 10 -2 ~10 -3 Pa. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0032] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the height of the small cylindrical ingot in step 1 is 30-40 mm, and the diameter is 10-15 mm. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a method for effectively inhibiting a second phase from precipitation in an Ni-Mn-Sn-Fe alloy, which relates to a preparation method of Ni-Mn-Sn-Fe metal fibers and aims to solve the problem that the Ni-Mn-Sn-Fe alloy can easily precipitate the second phase in the conventional cooling solidification process. The method comprises the following steps: 1. carrying out heat treatment on an alloy cast ingot; 2. putting the cleaned alloy cast ingot into an aluminum oxide hollow cylinder, putting in an electromagnetic induction heating coil, and inserting a ceramic cylinder under the alloy cylinder cast ingot; 3. repeating the vacuumizing-argon introduction process, and finally maintaining the working chamber under certain argon pressure; 4. rotating a metal roller, and switching on an induction heating power source; 5. contacting an alloy melting bath with the metal roller so that the molten alloy in the melting bath is spun into the Ni-Mn-Sn-Fe alloy fibers. The melt extraction technique is adopted to prevent the molten alloy elements from precipitating the second phase in the solidification process.

Description

technical field [0001] The invention relates to a preparation method of Ni-Mn-Sn-Fe metal fiber. Background technique [0002] Traditional compressed air refrigeration technology has the disadvantages of high energy consumption, heavy pollution, and low efficiency. It is urgent to develop other types of refrigeration technology or pollution-free refrigerants. As a new type of green refrigeration technology, magnetic refrigeration is expected to become the leading refrigeration technology in the future. Ni-Mn-Sn-Fe alloy has both the diametrical magnetocaloric effect at the martensitic transformation and the positive magnetocaloric effect at the austenite Curie temperature. It can be used as a new type of magnetic refrigeration material, which has attracted extensive attention and research in the material science community. [0003] However, with the increase of Fe content, the Ni-Mn-Sn-Fe alloy will precipitate the second phase. However, the second phase does not contribute...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10
Inventor 张学习张鹤鹤耿林
Owner HARBIN INST OF TECH
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