rEXmGYnI4-zAz alloy of storing hydrogen and uncrystallized preparation method

A technology for alloys and amorphous alloys, which is applied in the field of preparing hydrogen storage alloys and their amorphous materials, and can solve the problems of low hydrogen release, high H overpotential, electrochemical capacity, and low cycle life

Inactive Publication Date: 2005-01-12
桂林电子工业学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in practice, Mg 2 The electrochemical capacity and cycle life of N are still lower than LaNi 5 , because: (a) Mg 2 The hydride formed by Ni is stable at room temperature and not easy to dehydrogenate, with high H overpotential and low hydrogen release; (b) contact with strong alkaline electrolyte (6mol / L KOH) or electrode polarization, The surface of the alloy powder is easy to form an inert oxide layer, which prevents the exchange and transfer of H between the electrolyte and the alloy surface and the diffusion of H into the alloy body

Method used

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  • rEXmGYnI4-zAz alloy of storing hydrogen and uncrystallized preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] According to the molecular formula LaMgNi 4 The atomic ratio of rare earth La, magnesium powder, nickel powder. A total of 10g of mixed powder is put into a stainless steel ball mill tank, the ball-to-material ratio is 10:1, the large, medium and small balls are reasonably matched, the total balls are 100g, the speed of the ball mill is 200r / min, and the ball milling process is protected by argon. Carry out down, reverse positive and negative every 30 minutes, take out after 6 hours of ball milling and press into a block sample, the size of the block sample is: 28×6×6mm, and the pressure is 57 kN. The bulk sample is packaged in a quartz tube under the protection of argon, and the argon pressure in the tube is 0.04-0.05Mpa. The quartz tube that encapsulates the sample is put into a resistance furnace for sintering treatment. The sintering process is: 673K, 2h→873K, 2h→973K, 2h. Raise from low temperature to high temperature, keep the temperature at each temperature for...

Embodiment 2

[0045] The master alloy NdNi (atomic ratio is Nd:Ni=1:1) is broken, according to the molecular formula NdMgNi 3.5 Ti 0.05 The atomic weight ratio, the crushed powder (particle size about 3mm) and the calculated amount of magnesium powder, nickel powder, titanium powder are mixed, a total of 10g, put into a stainless steel ball mill tank, the ball-to-material ratio is 10:1, large, medium and small Reasonably match the grinding balls, the total weight of the grinding balls is 100g, the speed of the ball mill is 150r / min, the ball milling process is carried out under the protection of argon, and the positive and negative are reversed every 30 minutes. After 10 hours of ball milling, take out and press into a block sample. : 28×6×6mm, the pressure is 60 kN. The bulk sample is packaged in a quartz tube under the protection of argon, and the argon pressure in the tube is 0.04-0.05Mpa. The quartz tube encapsulating the sample is put into a resistance furnace for sintering treatment...

Embodiment 3

[0047] The master alloy PrNi (atomic ratio is Pr:Ni=1:1) is broken, according to the molecular formula Pr 0.05 MgNi 3 For the atomic ratio of V, mix the crushed powder (with a particle size of about 2mm) and the calculated amount of magnesium powder, nickel powder, and vanadium powder, totaling 10g, and put it into a stainless steel ball mill tank. The ball-to-material ratio is 10:1, large and medium Reasonable matching of small grinding balls, the total amount of grinding balls is 100g, the speed of the ball mill is 180r / min, the ball milling process is carried out under the protection of argon, and the positive and negative rotations are reversed every 30 minutes. After 9 hours of ball milling, take out and press into a block sample. The specifications are: 28×6×6mm, and the pressure is 55 kN. The bulk sample is packaged in a quartz tube under the protection of argon, and the argon pressure in the tube is 0.04-0.05Mpa. The quartz tube encapsulating the sample was put into ...

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Abstract

This invention introduces an alloy and its non-crystal taking rare earth, Mg powder, Ni powder as the master raw materials and its formula is: Rex Mgy Ni4-zAz, Re=Ca, La, Ce, Pr, Nd, y mixed rare earth, A=Ti, Co, V, Zr, Nb, Mn, Mo, Cu, Al, Fe among which, x and y is greater than or equal to O but less than or equal to 2 separately and z is greater or equal to zero but less than or equal to 1. The preparation method is to mix the raw materials in proportion then to be milled and pressed to a block to charge a quartz capsule housing it with Ar an package via temperature risen, constant and cool down to room temperature to produce the needed alloy, then the material with the formula of Rex MgyNi4-zAz is carried out with high energy ball mill or mechanical alloying to get related non-crystal.

Description

technical field [0001] The invention relates to a method for preparing a hydrogen storage alloy and its amorphous form by using rare earth, magnesium powder and nickel powder as main raw materials. Background technique [0002] Hydrogen storage material is a new type of functional material that has emerged in recent years. It is of great significance for hydrogen storage, transportation, secondary batteries and other applications. For example, hydrogen storage alloys not only have hydrogen storage properties, but also have the function of converting chemical energy and thermal energy or mechanical energy, so as to realize the chemical storage and transportation of thermal energy. Its application scope involves the storage and conversion of solar energy and wind energy, high-capacity rechargeable batteries, fuel cells, catalysts, waste heat, waste heat utilization and regeneration, robot power and brakes, vacuum insulation and getters, high-performance Dewar bottles And liqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02C22C19/03H01M8/22
CPCY02E60/50
Inventor 周怀营王仲民顾正飞成钢
Owner 桂林电子工业学院
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