Method for preparing Ni-Mn-Ga ferromagnetic shape memory alloy continuous fibers by adopting spinning method

A memory alloy and continuous fiber technology is applied in the field of preparation of Ni-Mn-Ga ferromagnetic shape memory alloy continuous fibers, which can solve the problem of low production efficiency of Ni-Mn-Ga fibers, inability to directly obtain bare fibers, and changing the surface state of fibers. and other problems, to achieve the effect of uniform size, high production efficiency and good surface condition

Inactive Publication Date: 2011-11-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the low production efficiency of Ni-Mn-Ga fiber prepared by the existing glass coating method (Taylor method), poor process repeatability, can not directly obtain bare fiber, and removing the glass coating will change the fiber surface State problem, the invention provides a kind of method that adopts spinning method to prepare Ni-Mn-Ga ferromagnetic shape memory alloy continuous fiber

Method used

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  • Method for preparing Ni-Mn-Ga ferromagnetic shape memory alloy continuous fibers by adopting spinning method
  • Method for preparing Ni-Mn-Ga ferromagnetic shape memory alloy continuous fibers by adopting spinning method
  • Method for preparing Ni-Mn-Ga ferromagnetic shape memory alloy continuous fibers by adopting spinning method

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specific Embodiment approach 1

[0020] Specific embodiment one: this embodiment is the method that adopts spinning method to prepare Ni-Mn-Ga ferromagnetic shape memory alloy continuous fiber, and it adopts the following steps to realize: one, according to the Ni-Mn-Ga alloy composition in Elements and their contents are prepared as raw materials, and then melted in a vacuum induction melting furnace to prepare Ni-Mn-Ga alloy ingots;

[0021] 2. After cleaning and drying the Ni-Mn-Ga alloy ingot obtained in step 1, put it into the crucible in the device for making amorphous metal wire, and then vacuumize the cavity to 0.5~5×10 -3 Pa filled with high-purity argon, and then vacuumed to 0.5 ~ 5 × 10 -3 Pa, then filled with high-purity argon, and then evacuated to 0.5~5×10 -3 pa, and then filled with high-purity argon until the argon pressure in the chamber reaches 35-65Pa, and keep the pressure;

[0022] 3. Start the metal roller and set the speed of the metal roller to 800-1800 rpm;

[0023] 4. Turn on the ...

specific Embodiment approach 2

[0029] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the composition and content of the Ni-Mn-Ga alloy ingot obtained in step one are: Ni 47.9±0.3 mn 31.8±0.3 Ga 20.3±0.2 or Ni 50.3±0.4 mn 26.9±0.7 Ga 22.8±0.1 . Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0030] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the high-purity argon gas described in step 2 is argon gas with a volume purity of 99.9%. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for preparing Ni-Mn-Ga ferromagnetic shape memory alloy continuous fibers by adopting a spinning method, and relates to a preparation method of Ni-Mn-Ga ferromagnetic shape memory alloy continuous fibers. The method solves the problems that the conventional glass coating method for preparing the Ni-Mn-Ga fibers has low production efficiency and poor process repeatability and bare fibers cannot be directly obtained. The method comprises the following steps of: putting Ni-Mn-Ga alloy ingots into a crucible of a device for preparing metallic amorphous wires, charging argon protection gas into a cavity, starting a metallic roller, heating the crucible, controlling the crucible to move to the metal roller after the alloy is smelted, and spinning the metal into the fibers when the high-speed rotating metal roller is in contact with the molten metal. The length of the prepared fibers reaches 1 to 10 centimeters, the diameter of the fibers is 30 to 80 microns, and the size of the fibers is uniform. The components of the fibers are uniform and consistent with the adopted alloy ingot components. The preparation method has high production efficiency and good process repeatability, the bare fibers can be directly obtained, and good surface state is kept.

Description

technical field [0001] The invention relates to a preparation method of a Ni-Mn-Ga ferromagnetic shape memory alloy continuous fiber. Background technique [0002] Ferromagnetic shape memory alloy is a new type of intelligent material. It not only has the same characteristics of martensitic phase transformation in the process of cooling as traditional shape memory alloys, but also can drive martensitic twin boundaries under the action of a magnetic field. Movement can quickly generate a large recoverable strain, so as to make up for the problems of slow response frequency and small strain of magnetostrictive materials caused by temperature control of traditional shape memory alloys. [0003] Ni-Mn-Ga ferromagnetic shape memory alloy is a typical representative. Its advantages are mainly manifested in its strong ferromagnetism, large temperature control and magnetic drive shape memory effect, response frequency close to piezoelectric ceramics, and output stress close to tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/06B22F9/08C22C19/03
Inventor 张学习钱明芳耿林孙剑飞
Owner HARBIN INST OF TECH
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