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A heat treatment method for improving the magnetocaloric properties of nickel-manganese-gallium fibers

A heat treatment method, nickel-manganese-gallium technology, which is applied in the field of heat treatment of nickel-manganese-gallium fibers, can solve the problems of large lag, difficult heat dissipation, poor magnetocaloric performance and refrigeration capacity of nickel-manganese-gallium alloys, and achieve improved refrigeration capacity and magnetic properties. Can effect

Active Publication Date: 2017-06-13
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of large hysteresis, difficult heat dissipation, and poor magnetic-caloric performance and refrigeration capacity of nickel-manganese-gallium alloy existing in the magnetic refrigeration process of existing nickel-manganese-gallium bulk materials, and provides a method for improving the magnetocaloric performance of nickel-manganese-gallium fibers. performance heat treatment method

Method used

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  • A heat treatment method for improving the magnetocaloric properties of nickel-manganese-gallium fibers
  • A heat treatment method for improving the magnetocaloric properties of nickel-manganese-gallium fibers
  • A heat treatment method for improving the magnetocaloric properties of nickel-manganese-gallium fibers

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specific Embodiment approach 1

[0029] Specific implementation mode one: the heat treatment method for improving the magnetocaloric performance of nickel-manganese-gallium fiber in this embodiment is carried out according to the following steps:

[0030] 1. Preparation of alloy ingots:

[0031] According to Ni 50.6 mn 28 Ga 21.4 Prepare the raw materials according to the content of each element component in the mixture, and then use a vacuum melting furnace to prepare nickel-manganese-gallium alloy ingots;

[0032] 2. Preparation of alloy fibers:

[0033] A. Cut the alloy ingot into cylinders with a height of 8-10mm by wire electric discharge, immerse in acetone and ultrasonically clean the surface to remove oil, put it in a drying oven at 120-125°C for 2-3 hours and take it out;

[0034]B. Put the ingot after cleaning and drying into the crucible of the melt spinning equipment, 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, and t...

specific Embodiment approach 2

[0041] Embodiment 2: This embodiment differs from Embodiment 1 in that: the diameter of the alloy fiber prepared in step 2 is 35-80 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0042] Embodiment 3: This embodiment is different from Embodiment 1 in that: the diameter of the alloy fiber prepared in step 2 is 50-65 μm. Others are the same as in the first embodiment.

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Abstract

A heat treatment method for improving the magnetocaloric properties of nickel manganese gallium fibers relates to a heat treatment method for nickel manganese gallium fibers. The purpose of the invention is to solve the problems of large hysteresis, difficult heat dissipation, and poor magnetic-caloric performance and refrigeration capacity of the nickel-manganese-gallium alloy existing in the magnetic refrigeration process. Method: 1. Preparation of alloy ingot; 2. Preparation of alloy fiber; 3. Cleaning and drying of alloy fiber; 4. Cleaning, drying and pretreatment of quartz tube; heat treatment. This method processes and obtains fibers with good magnetic properties, small hysteresis, and partial coupling between the first-order phase transition and the second-order phase transition, thereby achieving the purpose of coordinating the magnetic entropy change of the nickel-manganese-gallium fiber and the refrigeration working range, improving the refrigeration capacity, and solving the problem of nickel-manganese-gallium Alloys as magnetic refrigeration materials have a series of problems. The invention is used in the field of magnetic refrigeration materials.

Description

technical field [0001] The invention relates to a heat treatment method of nickel manganese gallium fiber. Background technique [0002] In recent years, with the extensive advocacy of the idea of ​​sustainable development, environmental issues have received more and more attention. In terms of refrigeration technology, most of the traditional refrigeration technologies use gaseous working fluids such as freon and ammonia, which cause great pollution and damage to the environment, especially freon working medium, which seriously damages the ozone layer of the atmosphere and threatens the survival and safety of human beings. In terms of solving this problem, people are also committed to developing fluorine-free gas working fluids to solve the problem of ozone layer damage. However, most of them still have a greenhouse effect and still cannot solve the huge defects of compression refrigeration technology. In recent years, a technology called "magnetic refrigeration" has attra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00
Inventor 张学习钱明芳耿林
Owner HARBIN INST OF TECH
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