High strength and large specific heat multiphase magnetic cold storage material and preparation method thereof

A cold storage material and high-strength technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of waste and loss of function of rare earth materials, and achieve the effect of improving quality, facilitating processing and molding, and reducing requirements.

Active Publication Date: 2017-06-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Because rare earth materials are easy to oxidize, it is also very easy to lose their function due to oxidation during use, resulting in rare earth materials being discarded after several years of use

Method used

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  • High strength and large specific heat multiphase magnetic cold storage material and preparation method thereof
  • High strength and large specific heat multiphase magnetic cold storage material and preparation method thereof
  • High strength and large specific heat multiphase magnetic cold storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Using the Er metal raw material with an oxygen content as high as 0.32wt%, using the preparation process of the present invention, the master alloy is placed in the crucible, and the vacuum is evacuated to 5*10 before heating. -3 Pa, then introduce argon gas into the crucible, the pressure of argon gas is 0.06MPa, and then melt the master alloy, let it stand for 30 minutes at 1100 ° C, flow out from the crucible with holes, and leave high oxygen in the crucible content of the master alloy balance. A sample of Example 1 with an Er content of 92 wt %, a Ni content of 7.9 wt % and an oxygen content of 0.1 wt % was obtained. Then put the material into the vacuum annealing furnace, and vacuumize to 8*10 -3 In the state of Pa, heat to 700°C, then introduce 0.05MPa argon, adjust the temperature to 830°C, and anneal for 3 days. Although the oxygen content in the Er metal raw material is very high, the oxygen content of the finally obtained sample of Example 1 of the present i...

Embodiment 2

[0053] Ho metal feedstock with an oxygen content up to 0.48 wt% was used. Using the preparation process of the present invention, the master alloy is placed in the crucible, and the vacuum is evacuated to 7*10 before heating. -3 Pa, then introduce argon gas into the crucible, the argon pressure is 0.5Pa, and then melt the master alloy, let it stand at 1120°C for 20 minutes and then cool it in the alumina crucible, and then cut off the cooled master alloy At the top of the high oxygen content, the sample of Example 2 with a Ho content of 65.8 wt%, a Cu content of 34.14 wt%, and an oxygen content of 0.06 wt% was obtained. Then put the material into the vacuum annealing furnace, and vacuumize to 8*10 -3 In the state of Pa, heat to 760°C, then introduce 0.03MPa argon, adjust the temperature to 860°C, and anneal for 2 days. Figure 9 It is the backscatter diagram of the sample of Example 2 of the present invention. It can be seen from the figure that in this embodiment, there ar...

Embodiment 3

[0055] The master alloy of Example 3 was prepared and smelted from rare earth Er raw materials with an oxygen content of 0.4wt%, and 30wt% Er3Ni recycled materials with an oxygen content of 0.8wt%. Put the master alloy in the crucible, vacuum to 7*10 before heating -3 Pa, then introduce argon gas into the crucible, the pressure of argon gas is 0.06MPa, and then melt the master alloy, put the molten master alloy at 1350°C, let it stand for 11 minutes, and then flow out from the crucible with holes, leaving There is a high oxygen content to spare. A sample of Example 3 with an Er content of 95.6 wt%, a Ni content of 4.2 wt%, and an oxygen content of 0.2 wt% was obtained. Then put the material into the vacuum annealing furnace, and vacuumize to 8*10 -3 In the state of Pa, heat to 740 degrees, then introduce 0.05MPa argon, adjust the temperature to 840 degrees, and anneal for 5 days. Figure 12 It is the backscatter diagram of the sample of Example 3. It can be seen from the f...

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Abstract

The invention discloses a high-intensity large-specific heat multiphase magnetic cold accumulation material and a preparation method thereof. The material consists of at least two phases or more than two phases; sample preparation is carried out according to an ASTM E9-09 standard; a compression test is carried out; the compression intensity is large than 200 MPa; within the temperature range of 2K-10K, the unit volume specific heat value and the heat capacity value of the material are both larger than the unit volume specific heat value and the heat capacity value of Pb; and within the temperature range of 10K-40K, the unit volume specific heat value and the heat capacity value of the material are respectively 83% larger than the unit volume specific heat value and the heat capacity value of Pb. A low-purify metal or a recovered material is used as a raw material; a deoxygenization technology is utilized to obtain the high-intensity large-specific heat multiphase magnetic cold accumulation material with a lower oxygen content than the oxygen content of the raw material; from 4K to 40 K, a large specific heat is presented, so that the material can replace Pb for use; the material is prepared by using the raw material with a high oxygen content; the material requirement is reduced; the preparation cost is saved; and the price competitive capacity is improved.

Description

technical field [0001] The invention belongs to the technical field of rare earth magnetic materials, and in particular provides a multi-phase magnetic cold storage material with high strength and large specific heat obtained by using low-purity raw materials and a preparation method thereof. Background technique [0002] Small cold-storage gas refrigerators are generally used in superconductor systems, nuclear magnetic resonance imaging (NMR-CT), and also in the cooling of photoelectric remote sensing instruments in outer space, and microelectronic equipment, becoming an indispensable technology in modern life and scientific development. [0003] The refrigeration efficiency of a small cold storage gas refrigerator is mainly determined by the filling material of the cold storage. The larger the specific heat capacity of the filling, the higher the efficiency of the cold storage. Because Pb has a large specific heat capacity, it has been used as a low-temperature cold storag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C28/00C22C1/03C09K5/02
Inventor 龙毅胡俊洋张宏伟史镜明叶荣昌
Owner UNIV OF SCI & TECH BEIJING
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