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Preparation of Ni-Mn-Ga magnetic shape memory alloy by reduction-diffusion method

A memory alloy, nickel-manganese-gallium technology, applied in the new material field of shape memory materials, can solve the problems of unstable alloy performance, high equipment requirements, difficult processing, etc., and achieve stable and controllable composition, no environmental pollution, and low production cost Effect

Active Publication Date: 2012-05-30
NINGBO KONIT IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nickel-manganese-gallium alloys with magnetic memory alloys appear in single crystals or oriented polycrystals. Although single crystal alloys have the largest strain (up to 12%), the preparation process of single crystal alloys is difficult, requires high equipment, and consumes The time length (general growth rate is 2 mm / hour), the composition segregation is large, which causes the Ms drift and makes the alloy performance unstable, especially the alloy size is limited (diameter <10 mm), which cannot meet the actual needs of a large number of large-size alloys. In addition, due to the high brittleness of the parent phase of the alloy, it is not easy to process, which affects the device fabrication of the material.

Method used

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  • Preparation of Ni-Mn-Ga magnetic shape memory alloy by reduction-diffusion method
  • Preparation of Ni-Mn-Ga magnetic shape memory alloy by reduction-diffusion method
  • Preparation of Ni-Mn-Ga magnetic shape memory alloy by reduction-diffusion method

Examples

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Effect test

Embodiment 1

[0040] Mix 1000 grams of nickel powder, 474 grams of manganese powder, 721 grams of gallium oxide, 500 grams of Ca particles, and 680 grams of NaCl with a mixer for 1.5 hours. 2 Press the sample into a ring-shaped block, put it into the reactor, and place it in a resistance heating furnace. After vacuuming to 2Pa, fill it with Ar gas to a positive pressure of 1.05MPa, and heat it to 950 under the protection of Ar gas. ℃, keep warm for 10 hours, then cool down to below 60 ℃ with the furnace, control at 30-60 ℃, take out the sample and place it in 5% NH by weight4 Soak in Cl aqueous solution for 6 hours, wash with water under agitation until the solution is brown, then wash with 2% (volume) acetic acid aqueous solution and 1% EDTA ammonia solution for 2 times, wash with water until the solution is neutral (pH value), and then filter. Rinse and filter twice with absolute ethanol, and then vacuum dry for 1 hour to obtain 2010 grams of alloy powder, containing 49.7% Ni, 23.6% Mn, 26...

Embodiment 2

[0046] 1000 grams of nickel powder, 474 grams of manganese powder, 721 grams of gallium oxide, 500 grams of Ca particles, CaCl 2 680 grams, after mixing uniformly with a mixer for 3 hours, use 800Kg / cm 2 Press the sample into a ring-shaped block, put it into the reactor, and place it in a resistance heating furnace. After vacuuming to 2Pa, fill it with Ar gas to a positive pressure of 1.25MPa, and heat it to 1100 under the protection of Ar gas. ℃, keep it warm for 7 hours, then cool down to below 60℃ with the furnace, control it at 30-60℃, take out the sample and place it in 10% NH by weight 4 Soak in Cl aqueous solution for 7 hours, wash with water under agitation until the solution is brown, then wash with 2% (volume) acetic acid aqueous solution and 1% EDTA ammonia solution for 2 times, wash with water until the solution is neutral (pH value) and then filter. Rinse and filter twice with absolute ethanol, and then vacuum-dry for 2 hours to obtain 2008 grams of alloy powder,...

Embodiment 3

[0049] 1000 grams of nickel powder, 474 grams of manganese powder, 721 grams of gallium oxide, 500 grams of Ca particles, MgCl 2 680 grams, after mixing uniformly with a mixer for 4 hours, use 600Kg / cm 2 Press the sample into a ring-shaped block, put it into the reactor, and place it in a resistance heating furnace. After vacuuming to 2Pa, fill it with Ar gas to a positive pressure of 1.15MPa, and heat it to 980 under the protection of Ar gas. ℃, keep it warm for 9 hours, then cool down to below 60℃ with the furnace, control it at 30-60℃, take out the sample and place it in 6% NH by weight 4 Soak in Cl aqueous solution for 5 hours, wash with water under agitation until the solution is brown, then wash twice with 4% (volume) acetic acid aqueous solution and 1% EDTA ammonia solution, and filter until the solution is neutral (pH value). Rinse and filter twice with absolute ethanol, and then vacuum-dry for 2 hours to obtain 2011 grams of alloy powder, containing 49.61% Ni, 23.58%...

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Abstract

The invention relates to a method for preparing Ni-Mn-Ga magnetic shape memory alloy with magnetic-field-induced high strain and shape memory effect, which adopts metal calcium and alkali chloride or alkaline earth metal chloride as a reducer, and directly prepares the Ni-Mn-Ga magnetic shape memory alloy in a vacuum resistance furnace directly by metal nickel, metal manganese and gallium oxide through a reduction-diffusion method. Compared with the prior art, the method has the characteristics of no environmental pollution, simple process and low cost, directly prepares the Ni-Mn-Ga magneticshape memory alloy with the magnetic-field-induced high strain and the shape memory effect, and can be used for industrialized mass production.

Description

technical field [0001] The invention relates to the technical field of new materials of shape memory materials, in particular to a preparation method of a nickel-manganese-gallium magnetic memory alloy with magnetically induced high strain and shape memory effect. Background technique [0002] Nickel-manganese-gallium magnetic memory alloy is a new type of memory material developed in recent years. It can undergo reorientation of martensitic twin transformation or magnetic field-induced martensitic transformation under the action of an external magnetic field to produce large reversible strain. Studies have shown that nickel-manganese-gallium magnetic memory alloy is the only ferromagnetic Heusler alloy with thermoelastic martensitic transformation, so that nickel-manganese-gallium magnetic memory alloy can be used for both temperature sensors and magnetic field sensors. Memory alloys are currently widely used in various intelligent applications, such as various drives, sens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/20
Inventor 鲍志林
Owner NINGBO KONIT IND
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