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Rare earth nickel magnesium intermediate alloy for hydrogen storage alloy and preparation method of rare earth nickel magnesium intermediate alloy

A technology for hydrogen storage alloys and master alloys, which is applied in the field of rare earth nickel-magnesium master alloys for hydrogen storage alloys and its preparation. It can solve the problems of excessive impurity elements that are difficult to control, difficult to reach battery materials, and affect the performance of hydrogen storage materials. Easy to add and control the composition, reduce the evaporation of magnesium, the effect of consistent composition

Inactive Publication Date: 2012-07-04
LONGNAN LONGYI HEAVY RARE EARTH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the existing nickel-magnesium alloys used in the metallurgical industry have unstable magnesium content, and it is difficult to meet the requirements of nickel-magnesium alloys for battery materials, especially the problem of excessive impurity elements is difficult to control, which directly affects the performance of hydrogen storage materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: An alloy containing 40% Mg, 2% Y, and the remainder of Ni was smelted in a vacuum induction furnace. The capacity of the vacuum furnace is 25Kg, and a magnesium oxide crucible is used.

[0029] The raw materials used are nickel beads, magnesium particles, rare earth metals, and the purity of argon is greater than 99.99%. And pickled and dried. The actual charge is 10Kg. The loss of magnesium and rare earth is calculated as 4% and 0.5%, and the yield of nickel is calculated as 100%. Weigh the material, the magnesium particles are 4.16Kg, the nickel beads are 5.8Kg, and the metal yttrium is 0.201Kg. Feeding, 1.7kg of magnesium grains are added to the bottom of the crucible, pounded, all the nickel beads are added, and the remaining magnesium grains are added to the top layer; the rare earth metals are placed in the feeding hopper. Turn on the vacuum pump for 5 minutes, and the vacuum degree in the vacuum furnace reaches 0.5KPa, then stop vacuuming. Open the...

Embodiment 2

[0031] Embodiment 2: Mg50%, La3%, Ni balance alloy are smelted in a vacuum induction furnace, the capacity of the vacuum furnace is 25Kg, and a magnesium oxide crucible is used.

[0032] The raw materials used are nickel beads, magnesium particles, rare earth metals, and the purity of argon is greater than 99.99%. And pickled and dried. The actual charge is 10Kg. The loss of magnesium and rare earth is calculated as 4% and 0.5%, and the yield of nickel is calculated as 100%. Weigh the material, the magnesium particles are 5.2Kg, the nickel beads are 4.7Kg, and the metal lanthanum is 0.3Kg. Feeding, 2.1kg of magnesium grains are added to the bottom of the crucible, pounded, all the nickel beads are added, and the remaining magnesium grains are added to the top layer; the rare earth metals are placed in the feeding hopper. Turn on the vacuum pump for 5 minutes, and the vacuum degree in the vacuum furnace reaches 0.5KPa, then stop vacuuming. Open the argon valve, fill the arg...

Embodiment 3

[0034] Example 3: Mg 50% La 3% rare earth nickel-magnesium alloy was used to prepare 1Kg Mg-LaNi5 hydrogen storage alloy powder.

[0035] Ingredients: 0.6kgNi, 0.3Kg metal La, 0.1Kg NiMgLa master alloy.

[0036] Preparation process: 0.6kgNi and 0.3Kg metal La are melted by induction in argon, and the NiMgLa master alloy is added from the hopper after melting. After melting, it is poured into a water-cooled ingot mold. The prepared Mg-LaNi5 alloy was mechanically crushed to 70 μm. The hydrogen absorption and desorption characteristics of these alloys were studied by electrochemical charge-discharge method. Mg-LaNi5 showed a large discharge capacity (415mAh / g) which was 1.3 times that of LaNi5 series alloys (322mAh / g). Both are higher than LaNi5 series alloys. It is easier to control the composition of the smelted magnesium-based hydrogen storage alloy by adding rare earth nickel-magnesium alloy, so as to ensure the charge and discharge performance of the alloy.

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Abstract

The invention relates to a rare earth nickel magnesium intermediate alloy for a hydrogen storage alloy, which comprises the following compositions in percentage by mass: 40-65 percent of Mg, 30-55 percent of Ni, 1-5 percent of RE, 0-0.5 percent of Fe, 0-1.5 percent of Si, 0-2.5 percent of Al, 0-0.5 percent of Zn, 0-0.5 percent of Cu, 0-0.1 percent of Cr, 0-0.5 percent of Mn, 0-0.5 percent of Ti, and 0-0.5 percent of Ca, wherein the RE comprises 0-100 percent of Y, 0-50 percent of La, and 0-50 percent of Ce. A preparation method comprises the following steps of: material processing, compounding, loading, vacuumizing, gas shielding, power transmitting, melting, stirring, secondary feeding, halting, stirring and pouring. The rare earth nickel magnesium intermediate alloy for the hydrogen storage alloy has stable components, and is suitable for being added into hydrogen storage materials.

Description

technical field [0001] The invention relates to a rare-earth nickel-magnesium master alloy for hydrogen storage alloys and a preparation method thereof. technical background [0002] Magnesium-based hydrogen storage materials have broad application prospects because of the large hydrogen storage capacity, light weight, and the abundant resources of magnesium and hydrogen on the earth. The main problems in the application of magnesium-based hydrogen storage alloys as electrode materials are poor kinetic properties and fast capacity fading during charge-discharge cycles. A large number of studies have shown that the kinetic properties of magnesium-based hydrogen storage materials can be significantly improved by combining magnesium-based hydrogen storage materials with a rare-earth hydrogen-storage alloy with good kinetic properties such as LaNi5 through an appropriate preparation process, thereby obtaining a new type of rare-earth- Magnesium-nickel based high-capacity compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C19/05C22C19/03C22C1/02
Inventor 朱福生刘生林刘燕平杨宇鹏杨清
Owner LONGNAN LONGYI HEAVY RARE EARTH TECH CO LTD
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