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Thulium-based metallic glass, preparation method and application

A technology based on metal and glass, applied in the field of magnetic refrigeration and material science, to achieve the effect of large magnetocaloric effect, improved efficiency, and large magnetic entropy change value

Active Publication Date: 2018-01-23
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the magnetic entropy change of existing rare-earth-based metallic glasses is still relatively small compared with crystal materials, so the development of new rare-earth-based metallic glasses with larger magnetic entropy, better refrigeration efficiency, and wider working temperature range can not only It is of great strategic significance to promote the application of rare earth-based metallic glass in the field of magnetic refrigeration as a magnetic refrigeration working material, and to develop the application value of rare earth resources for China, which is rich in rare earth resources.

Method used

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  • Thulium-based metallic glass, preparation method and application
  • Thulium-based metallic glass, preparation method and application
  • Thulium-based metallic glass, preparation method and application

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preparation example Construction

[0052] Such as figure 1 Shown, its specific preparation method comprises the following steps:

[0053] S1: Tm, RE, Al, and T components are provided according to the atomic ratio required by the formula (I).

[0054] S2: Smelting the provided Tm and RE into a master alloy.

[0055] S3: melting the master alloy together with Al and T, and obtaining a master alloy ingot after cooling.

[0056] S4: melting the master alloy ingot into a master alloy melt, and casting the master alloy melt by suction casting to obtain the thulium-based metallic glass.

[0057] Therefore, according to the preparation method of the thulium-based metallic glass according to the embodiment of the present invention, the critical cooling rate required for the preparation is low, the preparation method is simple, and the prepared thulium-based metallic glass has good thermal stability, strong oxidation resistance and corrosion resistance.

[0058] Specifically, formula (I) RE represents one or more rar...

Embodiment 1

[0071] The thulium-based metallic glass was prepared by using Tm, Ho, Co and Al with a raw material purity of 99.9 wt% or more and a molar ratio of 39:16:20:25.

[0072] First of all, after the four components are distributed in proportion, Tm and Ho are melted into a uniform master alloy in an electric arc furnace in an argon atmosphere adsorbed by titanium, and then mixed with Co and Al and melted, and then obtained after cooling The master alloy ingot of Tm-Ho-Co-Al quaternary alloy is cast; then the ingot is re-melted using the conventional metal mold casting method, and the master alloy melt is sucked into the water-cooled copper mold by using the suction casting device in the electric arc furnace , you can get a Tm with a diameter of 3mm 39 Ho 16 co 20 Al 25 Cylindrical metallic glass samples.

[0073] by such as figure 2 The X-ray diffraction (XRD) image of the alloy shown is visible as a single diffuse scattering peak, confirming that the cylindrical sample is a ...

Embodiment 2～9

[0078] Each thulium-based metallic glass was prepared in the same preparation method as in Example 1 according to the composition shown in Table 1.

[0079] X-rays show that this series of alloys have a completely amorphous structure, such as Figure 8 shown.

[0080] Depend on Figure 9 It can be seen from the DSC curves of this series of alloys that there are glass transition temperature, initial crystallization temperature and wide supercooled liquid phase region in this series of alloys, and with the change of the added rare earth elements, the corresponding thermodynamic parameters also change. changes happened. Depend on Figure 8 and Figure 9 It can be seen that the series of alloys obtained in the present invention have a complete amorphous structure and good glass-forming ability, and the adjustment of thermodynamic parameters and glass-forming ability can be realized through composition adjustment.

[0081] Figure 10 to Figure 17 The curves of magnetic entrop...

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Abstract

The invention discloses a thulium-based metallic glass and its preparation method and application. The thulium-based metallic glass is mainly composed of thulium, and its composition is shown in formula (I), wherein, RE means selected from Ce, Pr, Nd, One or more rare earth elements in Sm, Gd, Tb, Dy, Ho and Er; T represents Co or Ni; a, b, c, d represent the atomic percentage of each element, 30≤a≤60, 5≤ b≤30, 20≤c≤25, 15≤d≤25, 50≤a+b≤60 and a+b+c+d=100. According to the thulium-based metallic glass of the present invention, the change of RE and T can modulate the amorphous forming ability on the one hand, and on the other hand can modulate the temperature range in which the magnetic transition of the thulium-based metallic glass occurs, broaden the magnetic transition region, and make it work in a wider range. It has a large magnetocaloric effect in the temperature range. TmaREbAlcTd (I).

Description

technical field [0001] The invention relates to the fields of magnetic refrigeration and material science, in particular, the invention relates to a thulium-based metallic glass with a giant magnetocaloric effect, and a preparation method and application of the metallic glass. Background technique [0002] Magnetic refrigeration technology realizes refrigeration through the excitation and demagnetization of magnetic refrigerant materials under the action of an external magnetic field. The external magnetic field is equivalent to the compressor in traditional refrigeration. Therefore, compared with traditional gas compression refrigeration, magnetic refrigeration has high refrigeration efficiency. It has the advantages of low noise, small size, environmental protection and pollution-free, applicable from low temperature to near room temperature, and a wide range of application fields. In 2000, the United Nations issued the Montreal Protocol, which aims to reduce the applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00
Inventor 霍军涛赵德乾丁大伟白海洋汪卫华
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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