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Preparation method of Mg-RE-Ni alloy hydrogen storage material

A hydrogen storage material, mg-re-ni technology, applied in the field of preparation of Mg-RE-Ni alloy hydrogen storage materials, can solve the problems of difficult control of Mg composition, increase process cost, etc., achieve high sample activity, reduce equipment The effect of cost and easy operation

Inactive Publication Date: 2011-02-02
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mg has a higher vapor pressure at a lower temperature (113Pa at 600°C), and the traditional high-temperature melting method and rapid quenching process make it difficult to control the Mg composition in Mg-based hydrogen storage materials; for Mg-20wt% LaNi 5 Composite powder sintering and laser sintering can generate Mg-Mg 2 Ni-LaMg 12 / La 2 Mg 17 eutectic phase, but LaNi 5 It needs to be obtained by induction melting first, which increases the requirements for equipment and increases the process cost

Method used

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  • Preparation method of Mg-RE-Ni alloy hydrogen storage material
  • Preparation method of Mg-RE-Ni alloy hydrogen storage material
  • Preparation method of Mg-RE-Ni alloy hydrogen storage material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1 A preparation method of a Mg-RE-Ni alloy hydrogen storage material, comprising the following steps:

[0024] (1) Mix the Mg, RE and Ni powders according to the molar percentage of 60:10:30, put them into a stainless steel ball mill under an argon protective atmosphere, and grind them uniformly with a planetary ball mill to obtain a mixture. RE is rare earth metal Y.

[0025] (2) the mixture is loaded into the mould under the protection of argon, and pressed with a pressure of 30Mpa and maintained for 5min to obtain a metal sheet; the metal sheet is placed in a graphite crucible mold, and then the metal sheet is sealed with graphite powder. upper and lower sides, and compacted, sealed.

[0026] (3) placing the sealed mold in a tube furnace under an argon atmosphere for powder sintering to obtain a sintered alloy;

[0027] Powder sintering refers to gradient sintering in which the heating rate of 10K / min is first raised to between 640°C and the temperature ...

Embodiment 2

[0030] Embodiment 2 A preparation method of a Mg-RE-Ni alloy hydrogen storage material, comprising the following steps:

[0031] (1) Mix the Mg, RE and Ni powders according to the molar percentage of 72:8:20, put them into a stainless steel ball mill under an argon protective atmosphere, and grind them uniformly with a planetary ball mill to obtain a mixture. RE is the rare earth metal La.

[0032] (2) The mixture is loaded into the mould under argon protection, and pressed at a pressure of 20Mpa and maintained for 10min to obtain a metal sheet; the metal sheet is placed in a graphite crucible mold, and then the metal sheet is sealed with graphite powder. upper and lower sides, and compacted, sealed.

[0033] (3) placing the sealed mold in a tube furnace under an argon atmosphere for powder sintering to obtain a sintered alloy;

[0034] Powder sintering refers to gradient sintering in which the heating rate of 7K / min is first raised to between 700°C and the temperature is ke...

Embodiment 3

[0037] Embodiment 3 A preparation method of a Mg-RE-Ni alloy hydrogen storage material, comprising the following steps:

[0038] (1) Mix the Mg, RE and Ni powders according to the molar percentage of 72:8:20, put them into a stainless steel ball mill under an argon protective atmosphere, and grind them uniformly with a planetary ball mill to obtain a mixture. RE is the rare earth metal Ce.

[0039] (2) The mixture is loaded into the mould under argon protection, and pressed at a pressure of 20Mpa and maintained for 10min to obtain a metal sheet; the metal sheet is placed in a graphite crucible mold, and then the metal sheet is sealed with graphite powder. upper and lower sides, and compacted, sealed.

[0040] (3) placing the sealed mold in a tube furnace under an argon atmosphere for powder sintering to obtain a sintered alloy;

[0041] Powder sintering refers to gradient sintering in which the heating rate of 10K / min is first raised to between 800°C and the temperature is k...

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Abstract

The invention relates to a preparation method of Mg-RE-Ni alloy hydrogen storage material, comprising the following steps: (1) mixing Mg powder, RE powder and Ni powder in percentage by molar of 60-89:1-10:10-30, and evenly grinding powder in the atmosphere of argon protection to obtain mixture; (2) tabletting the mixture under the argon protection, and sealing by graphite powder; (3) putting a sealed die in a tube furnace or a muffle furnace under argon or air atmosphere for sintering powder, and obtaining sintered alloy; (4) polishing the surface of the sintered alloy, and obtaining alloy powder by smashing and grinding; and (5) carrying out intermittent ball milling on the alloy powder under the argon protection to obtain nanocrystalline / amorphous magnesium base composite hydrogen storage material. The invention combines a powder sintering method with a mechanical ball milling method, which simplifies technology, leads operation to be easier, lowers equipment cost and ensures that the component of the obtained production is easy to control.

Description

technical field [0001] The invention relates to a preparation method of a hydrogen storage material, in particular to a preparation method of a Mg-RE-Ni alloy hydrogen storage material. Background technique [0002] Hydrogen energy has become one of the most potential energy sources in the future due to its renewability, high combustion value and good environmental protection effect. The development of hydrogen storage materials is the technical bottleneck for the application of hydrogen energy. Magnesium-based alloy hydrogen storage materials have large hydrogen storage capacity (MgH 2 The theoretical hydrogen storage is 7.6 wt%), and magnesium resources are abundant and cheap, so it is considered to be one of the most promising hydrogen storage materials for fuel cells and hydrogen-burning vehicles. In addition, it also has good application prospects in nickel-metal hydride batteries and power storage, and scientific institutions in various countries are also actively dev...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C23/00
Inventor 周园王宏宾年洪恩任秀峰孙庆国李翔
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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