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Single-phase PuNi3 type superlattice La-Y-Ni series hydrogen storage alloy and preparation method thereof

A hydrogen storage alloy, la-y-ni technology, applied in the direction of chemical instruments and methods, hydrogen, non-metallic elements, etc., can solve the problem of reducing the contact density between powder materials, affecting the efficiency of solid phase diffusion reaction, and reducing the solid phase Diffusion uniformity, etc.

Active Publication Date: 2021-04-27
BAOTOU RES INST OF RARE EARTHS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] After the precursor powder mixing is completed, it is pressed, and then the formed block is put into a heat treatment furnace for vacuum powder sintering. The material undergoes peritectic or solid phase diffusion reactions during the sintering stage, and the solid phase diffusion reaction is the main one. , the main factors affecting the solid phase diffusion reaction are sintering temperature, contact area between powders (powder particle size and mixing uniformity), contact pressure (molding pressure), sintering time, powder sintering method reported in literature, in sintering No pressure is applied to the material during the process. As the temperature rises, the powder begins to expand, which will reduce the contact between the powder and the degree of tightness, thus affecting the efficiency of the solid phase diffusion reaction and reducing the uniformity of the solid phase diffusion. The sintering vacuum degree, temperature and time put forward higher requirements. It takes a lot of manpower, material resources and financial resources to prepare single-phase La-Mg-Ni alloys through the vacuum powder sintering process.

Method used

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  • Single-phase PuNi3 type superlattice La-Y-Ni series hydrogen storage alloy and preparation method thereof
  • Single-phase PuNi3 type superlattice La-Y-Ni series hydrogen storage alloy and preparation method thereof
  • Single-phase PuNi3 type superlattice La-Y-Ni series hydrogen storage alloy and preparation method thereof

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preparation example Construction

[0054] Single-phase PuNi 3 The preparation method of type superlattice La-Y-Ni series hydrogen storage alloy specifically comprises the following steps:

[0055] Step 1: LaNi prepared by vacuum induction melting 5 、CeNi 5 、YNi 2 The alloy is crushed under the protection of the atmosphere, and the alloy powder below 38 microns is taken, according to LaNi 5 / CeNi 5 / YNi 2 The molar ratio is (1-x) / x / 2, 0≤x≤0.5, weigh and mix evenly;

[0056] Step 2: Put the mixed alloy powder into a graphite mold and put it into a vacuum hot pressing furnace, and hot press and form it into a hydrogen storage alloy material under vacuum conditions.

[0057] Step 21: Vacuumize the vacuum hot pressing furnace, the vacuum degree is ≤1.5×10 -2 Pa;

[0058] Step 22: Elevate from room temperature to holding temperature at a heating rate of 8-10°C / min, and press to form a hydrogen storage alloy material;

[0059] When the temperature rises from room temperature to 500°C, the pressure rises from ...

Embodiment 1

[0065] Embodiment 1: alloy composition is LaY 2 Ni 9

[0066] Will LaNi 5 and YNi 2 Separately crush with atmosphere protection, pass through a 38 micron sieve, keep the powder below 38 micron for later use, and return to continue crushing if it is above 38 micron; according to LaNi 5 / YNi 2 The molar ratio is 1 / 2, and the powder below 38 microns is weighed and mixed;

[0067] LaNi 5 / YNi 2 = 1 / 2 of the mixture was put into a graphite mold and placed in a vacuum autoclave; the vacuum was 1.5×10 -2 Pa; from room temperature to 930°C at a heating rate of 8°C / min, the holding temperature is 930°C, and the holding time is 6h; when rising from room temperature to 500°C, the pressure rises from no pressure to 35MPa, and the remaining temperature rises and The pressure of 35MPa is applied throughout the heat preservation stage; after the heat preservation is completed, it is cooled to room temperature with the furnace.

[0068] Such as figure 1 Shown, is the PuNi prepared i...

Embodiment 2

[0071] Embodiment 2: alloy composition is LaY 2 Ni 9

[0072] Will LaNi 5 and YNi 2 Separately crush with atmosphere protection, pass through a 38 micron sieve, keep the powder below 38 micron for later use, and return to continue crushing if it is above 38 micron; according to LaNi 5 / YNi 2 The molar ratio is 1 / 2, and the powder below 38 microns is weighed and mixed;

[0073] LaNi 5 / YNi 2 = 1 / 2 of the mixture was put into a graphite mold and placed in a vacuum autoclave; the vacuum was 1×10 -2 Pa, from room temperature to 950°C at a heating rate of 10°C / min, the holding temperature is 950°C, and the holding time is 6h; when the temperature rises from room temperature to 500°C, the pressure rises from no pressure to 20MPa, and the remaining temperature rises And the pressure of 20MPa is applied throughout the heat preservation stage; after the heat preservation is completed, it is cooled to room temperature with the furnace.

[0074] Such as figure 2 Shown is the X...

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Abstract

The invention discloses a single-phase PuNi3 type superlattice La-Y-Ni series hydrogen storage alloy and a preparation method thereof. LaNi5, CeNi5 and YNi2 alloys prepared by a vacuum induction melting method are respectively crushed into powder under the protection of atmosphere, the alloy powder is weighed according to a LaNi5 / CeNi5 / YNi2 molar ratio of (1-x) / x / 2 and 0<=x<=0.5, and uniform mixing is carrried out; and the evenly-mixed alloy powder is placed into a graphite die and then placed into a vacuum hot-pressing furnace, hot-pressing forming is conducted under the vacuum condition to form a hydrogen storage alloy material, the chemical composition of the hydrogen storage alloy material is La<1-x>Ce<x>Y2Ni9, 1-x and x are the molar ratio, and x is larger than or equal to 0 and smaller than or equal to 0.5. According to the preparation method, not only are process links and time reduced, but also the single-phase PuNi3 type La-Y-Ni-based hydrogen storage alloy can be obtained.

Description

technical field [0001] The invention belongs to hydrogen storage alloy technology, in particular, relates to a single-phase PuNi 3 Type superlattice La-Y-Ni series hydrogen storage alloy and its preparation method. Background technique [0002] The development of high-efficiency, zero-emission hydrogen energy technology is a major global strategic demand, including China, and the current large-scale application of rare earth-based hydrogen storage alloys is an important material for the development of hydrogen energy technology. Nickel-metal hydride (MH / Ni) batteries made of hydrogen storage materials, solid / H 2 Hydrogen storage system can be widely used in new energy (hybrid, pure electric, fuel cell power) vehicles, smart grid energy storage peak shaving, communication base station backup power supply and various portable electrical equipment. [0003] Rare earth-based hydrogen storage alloys are important materials for the development of hydrogen energy technology, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C1/04B22F9/04B22F3/14C01B3/00H01M4/38H01M10/30
CPCC22C19/03C22C19/007C22C1/0441B22F9/04B22F3/14C01B3/0031C01B3/0057H01M4/383H01M10/30Y02E60/10Y02E60/32
Inventor 李金张旭周淑娟赵玉园王利李宝犬徐津闫慧忠熊玮
Owner BAOTOU RES INST OF RARE EARTHS
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