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Hydrogen-storage alloy of metal oxide for air-conditioner

A technology for hydrogen storage alloys and hydrides, applied in the field of rare earth metals or lanthanide compounds, can solve the problems of increasing hydrogen absorption time, the equilibrium hydrogen pressure does not meet the requirements of hydrogen storage alloys, reducing the hydrogen absorption capacity of alloys, etc., and achieving convenient activation. Effect

Inactive Publication Date: 2005-12-28
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] Rare earth series AB 5 Type hydrogen storage alloy is an alloy that can better meet the above properties at present, among which LaNi 5 is a typical representative, LaNi 5 The hydrogen storage capacity is 1.4wt%, and the overall performance is good. Its defect is that the equilibrium hydrogen pressure does not meet the requirements of hydrogen storage alloys for air conditioners. LaNi 5 Alloying alloys, or adjusting the stoichiometric ratio to achieve a suitable equilibrium hydrogen pressure within the operating temperature range. For example, Japan used yttrium instead of lanthanum to increase the equilibrium hydrogen pressure of the alloy, and developed La 0.6 Y 0.4 Ni 4.8 mn 0.2 alloy
However, while increasing the equilibrium hydrogen pressure of the alloy, the hydrogen absorption capacity of the alloy is reduced, and the hysteresis of the hydrogen absorption and desorption of the alloy and the slope of the alloy platform are greatly increased, which is extremely unfavorable for improving the effective hydrogen circulation and efficiency of the metal hydride air conditioner. of
[0008] The inventors have developed La 0.6 Nd 0.4 Ni 4.8 mn 0.2 Alloy, although it increases the effective hydrogen absorption capacity of the alloy, greatly reduces the hysteresis of the hydrogen absorption and desorption of the alloy and the slope of the alloy platform, but the hydrogen absorption time is greatly increased, which is helpful for improving the effective hydrogen circulation and efficiency of the metal hydride air conditioner still extremely unfavorable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of hydrogen storage alloy La 0.6 Nd 0.4 Ni 4.8 mn 0.2 Cu 0.1 Alloy button ingots are formulated according to the design composition, and the metal purity (at%) used is La 99.3, Nd99, Ni 99.9, Cu 99.9, Mn 99.5. Clean the above-mentioned raw materials with an ultrasonic oscillator, then distribute the weight according to the design composition, put the prepared material in a water-cooled copper mold, and melt it in an electric arc furnace under the protection of an argon atmosphere. During the melting process, the alloy is turned over and weighed. Melt five times while carrying out electromagnetic stirring to ensure the uniformity of the alloy. After smelting, seal the alloy ingot in a vacuum quartz tube, put it into a heat treatment furnace, heat it up to 1100°C for 8 hours, and then quench it (the preparation method is an existing mature technology).

[0031] The hydrogen storage performance of the alloy is tested on a P-C-T tester, and the volumetric m...

Embodiment 2

[0039] The difference from Example 1 is: preparation and testing of hydrogen storage alloy La 0.6 Nd 0.4 Ni 4.8 mn 0.2 Cu 0.2 .

[0040] Measured results: the hydrogen storage capacity of the formed hydride is 1.4wt%, and the decomposition pressure is 0.13Mpa at 18°C. The hydrogen storage capacity of this alloy is higher than that of La 0.6 Y 0.4 Ni 4.8 mn 0.2 , the slope and hysteresis are significantly lower than La 0.6 Y 0.4 Ni 4.8 mn 0.2 , the hydrogen absorption rate is much higher than that of La 0.6 Nd 0.4 Ni 4.8 mn 0.2 , and easy to activate, the reaction enthalpy and decomposition pressure are suitable for the use of metal hydride air conditioners, and can be used with LaNi 4.61 mn 0.26 al 0.13 The hydrogen storage alloy works as an alloy to design a single-stage hydride air conditioner, working at an operating temperature of 140-160°C / 30-60°C / 10-20°C.

[0041] In this embodiment La 0.6 Nd 0.4 Ni 4.8 mn 0.2 Cu 0.2 The hydrogen absorption and des...

Embodiment 3

[0043] The difference from Example 1 is: preparation and testing of hydrogen storage alloy La 0.6 Nd 0.4 Ni 4.8 mn 0.2 Cu 0.3 .

[0044] Measured results: the hydrogen storage capacity of the formed hydride is 1.26wt%, and the decomposition pressure is 0.16Mpa at 18°C. The hydrogen storage capacity of this alloy has decreased, and the slope and hysteresis are significantly lower than La 0.6 Y 0.4 Ni 4.8 mn 0.2 , the hydrogen uptake rate is higher than that of La 0.6 Nd 0.4 Ni 4.8 mn 0.2 , and easy to activate, the reaction enthalpy and decomposition pressure are suitable for the use of metal hydride air conditioners, and can be used with LaNi 4.61 mn 0.26 al 0.13 The hydrogen storage alloy works as an alloy to design a single-stage hydride air conditioner, working at an operating temperature of 140-160°C / 30-60°C / 10-20°C.

[0045] In this embodiment La 0.6 Nd 0.4 Ni 4.8 mn 0.2 Cu 0.3 The hydrogen absorption and desorption PCT curve see Figure 6 .

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Abstract

A holding hydrogen alloy used for making metallic hydride air conditioning. The chemical formula is La0.6Nd0.4Ni4.8Mn0.2Cux(x=0.1-0.4). Release hydrogen dosage of it is 1.43wt% at common temperature. Decomposition pressure at 18íµ is between 1amp and 1.5amp. Hysteresis coefficient is 0.09-0.24. Rate of grade of parallel line is 0.05-0.1. Absorbing hydrogen dosage can reach 90% in 50-80s. Meanwhile, Releasing and absorbing hydrogen dosage dynamic property is improved.

Description

technical field [0001] The invention provides a metal hydride hydrogen storage alloy for air conditioners, which is a compound of rare earth metal or lanthanide. Background technique [0002] As the core material of air conditioners, heat pumps, and refrigerators, the refrigerant Freon has excellent performance. However, Freon destroys the ozone layer and causes serious environmental problems, so it is listed as an obsolete product. In order to replace Freon, scholars from all over the world are vigorously developing various refrigerants, and have made great progress. The energy transfer system using hydrogen as the working medium and relying on metal hydride as the energy conversion material is one of the methods with good development prospects. Its advantages are energy saving, environmental protection, no vibration, no noise, good reliability, and the working temperature range Big. [0003] The principle of the hydride hydrogen storage material and its air conditioner ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03
Inventor 杜屏曹玮吕曼祺杨柯陈江平
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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