A kind of rare earth hydrogen storage alloy for metal hydride heat pump and preparation method thereof

A hydrogen storage alloy and hydride technology, which is applied in heat pumps, lighting and heating equipment, refrigerators, etc., can solve the problems of large hysteresis in hydrogen absorption and desorption, small alloy capacity, and difficulty in activation, achieving small hysteresis and good resistance to pulverization Good performance and dynamic performance, comprehensive performance

Inactive Publication Date: 2011-12-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiFe-based alloys have disadvantages such as difficult activation, large hydrogen absorption and desorption hysteresis, and easy poisoning; TiMn-based alloys have relatively small capacity

Method used

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  • A kind of rare earth hydrogen storage alloy for metal hydride heat pump and preparation method thereof
  • A kind of rare earth hydrogen storage alloy for metal hydride heat pump and preparation method thereof
  • A kind of rare earth hydrogen storage alloy for metal hydride heat pump and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation and testing of hydrogen storage alloy LaNi 3.8 Al 1.0 Cu 0.2 alloy. The preparation method, heat treatment conditions and activation method are as described above.

[0033] Test result: LaNi 3.8 Al 1.0 Cu 0.2 Under the above activation conditions, the alloy can begin to absorb hydrogen quickly after only about 1100s of incubation period, and the activation process can be completed in one time. The hydrogen storage capacity of the hydride formed at 286K is 4.70. The equilibrium pressure of hydrogen absorption at 433K is 100kPa, the equilibrium pressure of hydrogen desorption is 93kPa, the hysteresis coefficient is very small, and the kinetic speed of hydrogen absorption and desorption is very fast. The maximum hydrogen absorption capacity is reached when the initial hydrogen pressure is 1.2MPa and the temperature is 433K. 90% only takes 40s. The enthalpy changes of hydrogen absorption and desorption are -49.45KJ / Mol and 49.87KJ / Mol respectively. The enthalpy ...

Embodiment 2

[0035] The difference from Example 1 lies in: preparing and testing hydrogen storage alloy LaNi 3.8 Al 1.0 Cr 0.2 .

[0036] Test result: LaNi 3.8 Al 1.0 Cr 0.2 Under the above activation conditions, the alloy can begin to absorb hydrogen quickly after only about 120s of incubation period, and the activation process can be completed in one time. The hydrogen storage of the hydride formed at 286K is 4.86. The equilibrium pressure of hydrogen absorption at 433K is 56kPa, the equilibrium pressure of hydrogen desorption is 53kPa, the hysteresis coefficient is small, and the kinetic speed of hydrogen absorption and desorption is very fast. The maximum hydrogen absorption capacity is reached when the initial hydrogen pressure is 1.2MPa and the temperature is 433K. 90% only takes 30s. The hydrogen absorption and desorption enthalpy changes are -52.69KJ / Mol and 53.21KJ / Mol respectively. The enthalpy of reaction, the platform pressure of hydrogen absorption and desorption, and the kinet...

Embodiment 3

[0038] The difference from Example 1 lies in: preparing and testing hydrogen storage alloy LaNi 3.8 Al 1.0 Fe 0.2 .

[0039] Test result: LaNi 3.8 Al 1.0 Fe 0.2 Under the above activation conditions, the alloy can begin to absorb hydrogen quickly after only about 750s of incubation period, and the activation process can be completed in one time. The hydrogen storage capacity of the hydride formed at 286K is 4.83. The equilibrium pressure of hydrogen absorption at 433K is 83kPa, the equilibrium pressure of hydrogen desorption is 80kPa, the hysteresis coefficient is very small, and the kinetic speed of hydrogen absorption and desorption is very fast. The maximum hydrogen absorption capacity is reached when the initial hydrogen pressure is 1.2MPa and the temperature is 433K. 90% only needs 35s. The hydrogen absorption and desorption enthalpy changes are -50.02KJ / Mol and 50.43KJ / Mol respectively. The enthalpy of reaction, the platform pressure of hydrogen absorption and desorption,...

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Abstract

A rare earth hydrogen storage alloy for a metal hydride heat pump and a preparation method thereof, characterized in that a new alloy composition is designed by adding elements such as Al, Mn, Cr, Fe, Cu and the like to the LaNi5 alloy and changing the alloy stoichiometric ratio The general formula of is La(Ni3.8Al1.2-xMx)y, where M=Mn, Cr, Fe, Cu, 0.2≤x≤0.6, 0.94≤y≤1.0. The overdosing of A-side elements led to the appearance of new phases in the alloy. The rare earth hydrogen storage alloy of the present invention is smelted in a non-consumable vacuum electric arc furnace, and the annealing heat treatment condition is that the sample is annealed at 1323K for 6 hours in a vacuum state and then rapidly cooled. The production method of the alloy is simple, the alloy is easy to activate, the plateau pressure is low, the hysteresis factor of hydrogen absorption and desorption is small, and at the same time, it has good kinetic properties of hydrogen absorption and desorption and anti-powdering performance, and is very suitable for hydrogen storage alloys for metal hydride heat pumps.

Description

Technical field [0001] The invention relates to a rare earth hydrogen storage alloy, provides a rare earth hydrogen storage alloy suitable for metal hydride heat pumps, and belongs to the field of hydrogen storage alloys. Background technique [0002] With economic development and social progress, people's living standards continue to improve, and more units or families use air conditioners. However, conventional air conditioners consume large amounts of energy. As a working medium, Freon is easy to leak and destroy the ozone layer of the atmosphere, causing serious environmental problems and harming the ecological balance. Therefore, finding and developing new alternative materials has become a common concern of all countries. The new metal hydride heat pump air conditioning system is considered to be a promising method. Its advantages are: waste heat, solar energy and other low-grade heat sources can be used to drive the heat pump, energy saving, environmental protection, no v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10F25B30/04
Inventor 李慎兰王培陈伟罗刚陈德敏杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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