Gadolinium block material and preparation method thereof

A technology of bulk materials and gadolinium blocks, which is applied in the field of gadolinium block materials and its preparation, can solve the problems of difficult preparation and difficult preparation of nanoparticles, and achieve the effects of easy-to-obtain raw materials, simple preparation process, and convenient operation

Active Publication Date: 2015-09-23
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, the rare earth gadolinium element has great chemical activity, and it is difficult to prepare it into nanoparticles. If you want to obtain a bulk material with nanocrystals, you must not only effectively prevent oxidation but also ensure that the material does not produce grains when it is prepared into a bulk material. grown up, and therefore, difficult to prepare

Method used

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  • Gadolinium block material and preparation method thereof
  • Gadolinium block material and preparation method thereof
  • Gadolinium block material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation method of Gd block material 1:

[0031] (1) Put 4 grams of metal gadolinium powder raw materials and 120 grams of stainless steel metal grinding balls (ball-to-material ratio is 30:1) into a 250ml stainless steel grinding jar together, and fill the argon (Ar) of 1 bar for protection; The ball milling tank with the raw material sample installed, that is, the above grinding tank is placed on a ball mill for ball milling, the ball milling conditions: the ball milling speed is 400rpm, and the ball milling time is 40 hours;

[0032] (2) In the pretreatment chamber (oxygen concentration is 0.4ppm) protected by high-purity argon gas (purity reaches more than 99.99%), put the ground gadolinium powder into the WC cemented carbide mold, and then pre-press it under 2Mpa pressure ;

[0033] (3) Put the mold containing gadolinium powder into spark plasma sintering (SPS for short) equipment (model SPS-5.40-IV / ET) to sinter it into metallic gadolinium bulk material. The ...

Embodiment 2

[0043] Preparation method of Gd block material 2:

[0044] (1) 4 grams of metal gadolinium powder raw materials and 200 grams of stainless steel metal grinding balls (ball-to-material ratio is 50:1) are put into a 250ml stainless steel grinding jar together, and the argon (Ar) that fills into 3bar is protected; Then put The ball milling tank with the raw material sample installed, that is, the above grinding tank is placed on a ball mill for ball milling, the ball milling conditions: the ball milling speed is 500rpm, and the ball milling time is 60 hours;

[0045] (2) In the pretreatment chamber (oxygen concentration is 0.3ppm) protected by high-purity argon gas (purity reaches more than 99.99%), put the ground gadolinium powder into the WC cemented carbide mold, and then pre-press it under 2Mpa pressure ;

[0046] (3) Put the mold containing gadolinium powder into spark plasma sintering (SPS for short) equipment (model SPS-5.40-IV / ET) to sinter it into metallic gadolinium bu...

Embodiment 3

[0052] Preparation method of Gd block material 3:

[0053] (1) 4 grams of metal gadolinium powder raw materials and 240 grams of stainless steel metal grinding balls (ball-to-material ratio is 60:1) are put into a 250ml stainless steel grinding jar together, and the argon (Ar) that fills into 3bar is protected; Then put The ball milling tank with the raw material sample installed, that is, the above grinding tank is placed on the ball mill for ball milling, the ball milling conditions: the ball milling speed is 300rpm, and the ball milling time is 20 hours;

[0054] (2) In a pretreatment chamber (oxygen concentration of 0.3ppm) protected by high-purity argon (purity above 99.99%), put the ground gadolinium powder into a WC cemented carbide mold, and then pre-press it under a pressure of 2Mpa ;

[0055] (3) Put the mold containing gadolinium powder into spark plasma sintering (SPS for short) equipment (model SPS-5.40-IV / ET) to sinter it into metal gadolinium bulk material. Th...

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Abstract

The invention discloses a gadolinium block material and a preparation method thereof. The preparation method comprises the following operation steps that firstly, metal gadolinium powder is used as the raw material and is ground through a mechanical milling method; secondly, the nanoscale gadolinium powder is placed in a die and pre-pressed in a pre-treatment chamber protected by argon; and thirdly, the die is placed in a spark plasma sintering device for sintering, and therefore the gadolinium block material is obtained. The preparation method is simple and practicable and can be used for preparing gadolinium block materials of different grain sizes; the average grain size of the material is adjustable within the range of 20-1000 nanometers, and the corresponding magnetothermal effect of the material within the grain size range is improved along with increase of the grain size of the prepared material.

Description

technical field [0001] The invention belongs to the technical field of room temperature magnetic refrigeration, and in particular relates to a gadolinium block material and a preparation method thereof. The method of the invention can prepare gadolinium bulk materials with different crystal grain sizes, so as to control the magnetocaloric effect of the gadolinium materials. Background technique [0002] For nano-scale rare earth metal elements, due to the reduction of their scale, the area of ​​the surface or grain boundary of the material increases sharply, so that it shows some new features in crystal structure, interface, thermodynamics, phase transition, etc., using these new These features ultimately enhance the optical, electrical, magnetic, mechanical and catalytic properties of the material. [0003] In recent years, room temperature magnetic refrigeration technology has become a research hotspot in the field of refrigeration technology due to its advantages of high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16C09K5/14
Inventor 曾宏高慧武英况春江周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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