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A magnetic phase change alloy

A magnetic phase transition and alloy technology, applied in the fields of inorganic material magnetism, inductance/transformer/magnet manufacturing, electrical components, etc., can solve the problems of small magnetocaloric effect, hinder the ideal practical working fluid of magnetocaloric materials, and high application cost, and achieve thermal effect. Enhanced, abundant reserves, good performance stability

Active Publication Date: 2018-06-26
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many shortcomings in this type of material: for rare earth-based compound refrigeration materials, the high proportion of precious rare earth metals makes the application cost too high; in many systems, the thermal effect of structural entropy change is opposite to that of magnetic entropy change, The effective thermal effect is offset; the high-temperature magnetocaloric effect is generally a second-order Curie temperature magnetic transition, and the magnetocaloric effect is small, while the magnetic phase transition temperature of the first-order magneto-structural phase change material with a giant magnetocaloric effect is generally below room temperature
These existing problems prevent existing magnetocaloric materials from becoming ideal and practical working fluids for magnetocaloric or energy conversion technologies

Method used

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Embodiment 1

[0032] The chemical formula of this embodiment preparation is Mn 25 Fe 9 Ni 32 Ge 18 Si 16 A magnetic phase change alloy with high temperature and large magnetic entropy change, in which Mn 25 Fe 9 Ni 32 Ge 18 Si 16 The alloy means that the alloy contains 25 atomic percent of Mn element, 9 atomic percent of Fe element, 32 atomic percent of Ni element, 18 atomic percent of Ge element and 16 atomic percent of Si element. In other embodiments, the same explanation is also made. Its preparation method is carried out according to the following specific steps:

[0033](1) According to the molar ratio of Mn:Fe:Ni:Ge:Si=25:9:32:18:16, respectively weigh Mn, Fe, Ni, Ge, Si metal raw materials with a purity of 99.9%;

[0034] (2) Put the weighed raw materials into a water-cooled copper crucible, and use a mechanical pump to evacuate the vacuum to 1×10 - 3 Below Pa, argon gas was introduced as a protective gas, and the polycrystalline sample ingot was smelted by the arc melt...

Embodiment 2

[0038] The chemical formula of this embodiment preparation is Mn 19 co 14 Ni 36 Ge 3.1 Si 27.9 Magnetic Phase Change Alloy Strip:

[0039] (1) According to the molar ratio of Mn:Co:Ni:Ge:Si=19:14:36:3.1:27.9, respectively weigh Mn, Co, Ni, Ge, Si metal raw materials with a purity of 99.9%;

[0040] (2) Put the weighed raw materials into the crucible, and use a mechanical pump to evacuate the vacuum to 1×10 - 3 Below Pa, argon gas is introduced as a protective gas, and the polycrystalline sample ingot is melted by the arc melting method. Each sample is turned over 3 times, and a total of 4 times of melting is used to ensure uniform composition;

[0041] (3) The obtained button spindle material is sealed in a vacuum quartz tube, annealed at 900° C. for 96 hours for homogenization annealing treatment, and then cooled to room temperature at a cooling rate of 2° C. / second;

[0042] (4) Put the annealed button spindle into a quartz tube with a small hole at the bottom, place ...

Embodiment 3

[0044] The preparation composition of this embodiment is: Mn 13 Fe 20 Ni 34 Ge 5 Si 28 A magnetic phase change alloy with high temperature and large magnetic entropy change; its preparation method is similar to that of Example 1, except that in step (1) the molar ratio Mn:Co:Ni:Ge:Si=13:20: 34:5:28 Weigh the raw materials and anneal at 900°C for 24 hours in step (3). The same method as in Example 1 was used to determine the phase transition temperature and magnetic entropy change. Table 1 shows the phase transition temperature and the magnetic entropy change value of the obtained sample at a magnetic field change of 50kOe. Example 4

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Abstract

The invention discloses a magnetic phase change alloy. The magnetic phase change alloy has a formula of (Mn1-alpha M alpha)xNiy(Ge1-beta Si beta)z; M=Fe or Co; x is not more than 36 and not less than 30; y is not more than 36 and not less than 30; z is not more than 36 and not less than 30; x+y+z=100; alpha is more than 0 and less than 0.8; and beta is not more than 1 and not less than 0. The magnetic phase change alloy has high-temperature huge magnetic heat effect, and widens the temperature range of a magnetic heating material; needed raw materials are rich in storage, easy to store and low in cost; and a preparation process is simple and reliable, is excellent in stability, and is easy to industrial produce. The magnetic phase change alloy is excellent in comprehensive performance, and is an ideal Mn base non-rare earth magnetic heat pump and thermomagnetic power generation candidate material.

Description

[0001] related application [0002] The present invention claims the priority of the Chinese patent application entitled "A Magnetic Phase Change Alloy with High Temperature Giant Magnetocaloric Effect" filed on April 29, 2015, with application number 201510209886.5, the entire contents of which are hereby incorporated by reference included in the present invention. technical field [0003] The invention relates to a magnetic heat pump or thermomagnetic power generation material with ferromagnetism and magnetocaloric effect, in particular to a magnetic phase change alloy with high temperature giant magnetocaloric effect. Background technique [0004] Common magnetic phase change alloys have one crystal structure (hereinafter referred to as high-temperature phase) at relatively high temperatures, and spontaneously change into another crystal structure (hereinafter referred to as low-temperature phase) at relatively low temperatures. When a material is cooled from a higher t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00H01F1/01H01F41/02
Inventor 刘恩克李勇郗学奎王文洪吴光恒
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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