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Under-measurement Laves phase hydrogen storage alloy and preparation method thereof

A technology for hydrogen storage alloys and alloys, applied in chemical instruments and methods, non-metallic elements, metal hydrides, etc., can solve the problems of poor cycle stability, short platform area, and reduced hydrogen storage capacity, and achieve small hysteresis, The effect of long platform area and large hydrogen storage capacity

Inactive Publication Date: 2009-09-23
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The results show that: when the Mn content x=59.4at.%, the hydrogen storage capacity of the alloy is the highest; and further increasing the Mn content, not only the hydrogen storage capacity is greatly reduced, but also the cycle stability becomes poor, which may be due to the change of the composition of the metal atoms. different occupancy, which leads to lattice expansion and non-uniform strain; therefore, in order to obtain alloys with good comprehensive properties, it is necessary to strictly control the chemical composition of the alloy; in addition, Ming et al. carried out multi-element substitution and optimized the Ti with large hydrogen storage capacity 0.9 Zr 0.3 mn 1.3 Mo 0.05 Cu 0.05 V 0.2 Cr 0.2 alloy, but its platform characteristics are poor; while the alloy composition screened out by Liu et al. 0.85 Cr 0.15 MnCr 0.8 V 0.1 Cu 0.1 , although its hydrogen absorption and desorption curve is flat and the hysteresis is small, but its plateau area is too short

Method used

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  • Under-measurement Laves phase hydrogen storage alloy and preparation method thereof
  • Under-measurement Laves phase hydrogen storage alloy and preparation method thereof
  • Under-measurement Laves phase hydrogen storage alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] According to TiMn 1.5 V z (z=0.1~0.5) The chemical composition of the alloy Weigh a total of 30g of Ti, Mn (considering the burning rate of 3wt.%) and V metal blocks with a purity greater than 99% and melt them in a magnetic levitation high-frequency induction furnace for 2 to 3 times; Put the as-cast alloy into a quartz tube and keep it warm for 7 days under the protection of argon at 950°C; finally cool the furnace to room temperature, take out the annealed alloy, grind to remove the scale on the surface of the alloy, then crush it mechanically, and pass through a 300-mesh sieve spare. The alloy consists of a single C14-type Laves phase (attached figure 2 for TiMn 1.5 V 0.2 X-ray diffraction pattern of the alloy). The hydrogen absorption / desorption curves of the alloys were determined by the Sievert method. The test steps are as follows: First, weigh 2g of the above-mentioned alloy powder, put it into the sample chamber, 2 Activated under pressure; then lowere...

Embodiment 2

[0046] According to Ti 0.85 Zr 0.15 mn 1.4 Cr 0.1 V 0.2 The chemical composition of the alloy weighs a total of 30g of Ti, Mn (considering the burning rate of 3wt.%) and V metal blocks with a purity greater than 99% and melts them in a magnetic levitation high-frequency induction furnace for 2 to 3 times; put the cast alloy into the quartz In the tube, it was kept under argon protection at 950°C for 7 days; finally, the furnace was cooled to room temperature, and the annealed alloy was taken out, polished to remove the oxide scale on the alloy surface, then mechanically crushed, and passed through a 300-mesh sieve for later use. The resulting alloy consists of a single C14-type Laves phase (attached Figure 5 for Ti 0.85 Zr 0.15 mn 1.4 Cr 0.1 V 0.2 X-ray diffraction pattern of the alloy); through Rietvield software fitting, it can be known that its lattice constant and unit cell volume are the same as those of TiMn 1.5 V 0.2 Alloy is significantly larger. The hydro...

Embodiment 3

[0048] According to Ti 0.85 Zr 0.15 mn 1.3 Cr 0.2 V 0.2 The chemical composition of the alloy weighs a total of 30g of Ti, Mn (considering the burning rate of 3wt.%) and V metal blocks with a purity greater than 99% and melts them in a magnetic levitation high-frequency induction furnace for 2 to 3 times; put the cast alloy into the quartz In the tube, it was kept under argon protection at 950°C for 7 days; finally, the furnace was cooled to room temperature, and the annealed alloy was taken out, polished to remove the oxide scale on the alloy surface, then mechanically crushed, and passed through a 300-mesh sieve for later use. The resulting alloy consists of a single C14-type Laves phase (attached Figure 7 for Ti 0.85 Zr 0.15 mn 1.3 Cr 0.2 V 0.2X-ray diffraction pattern of the alloy). The hydrogen absorption / desorption curves of the alloys were determined by the Sievert method. The test steps are as follows: First, weigh 2g of the above-mentioned alloy powder, pu...

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Abstract

The invention discloses an under-measurement Laves phase hydrogen storage alloy and a preparation method thereof. The general chemical formula of the alloy is TiuZrxMnvMyVz, wherein x is more than or equal to 0 and is less than or equal to 0.2; y is more than or equal to 0.1 and is less than or equal to 0.4; z is more than or equal to 0.1 and is less than or equal to 0.5, u plus x is equal to 1, and v plus y is equal to 1.5; the optimal range of y is more than or equal to 0.1 and is less than or equal to 0.2, and the optimal range of z is more than or equal to 0.1 and is less than or equal to 0.3; M element can be Cr, Ni or Cu; and the preparation method comprises the following steps: weighing the alloy according to the blending ratio; repeatedly melting block-shaped pure metal in a magnetic suspension high frequency induction furnace under the protection of argon gas for two times to three times; and annealing the obtained cast alloy for six to eight days at the temperature of 950 DEG C to 1050 DEG C under the protection of inert gas. The invention has the advantages of large hydrogen storage amount, small lag, long platform area and other good comprehensive performances.

Description

【Technical field】 [0001] The invention relates to the technical field of hydrogen storage alloys, in particular to an undermeasured Laves phase hydrogen storage alloy and a preparation method thereof. 【Background technique】 [0002] Faced with the increasingly serious energy shortage and environmental degradation, many countries have carried out large-scale exploration of new energy sources in recent years. Among them, hydrogen energy has attracted much attention as a clean secondary energy source, and solving the problem of hydrogen storage and transportation is one of the key technologies for hydrogen energy application. Compared with traditional high-pressure gaseous hydrogen storage and liquid hydrogen storage, the use of metal or alloy hydrogen storage has the advantages of high storage density, safety, and portability, and is an economical and effective hydrogen storage method. Therefore, it is urgent to find hydrogen storage alloys with high hydrogen storage capacity...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22F1/16C01B6/00
Inventor 孙大林李永涛张庆安陈国荣
Owner FUDAN UNIV
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