Method for nanocrystallization of magnesium-based hydrogen storage material
A hydrogen storage material and nanotechnology, which can be used in the production of hydrogen, grain processing, etc., and can solve the problems of shrinking crystal size, reducing the ductility and difficulty of ductile materials.
Active Publication Date: 2013-06-19
IND TECH RES INST
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Problems solved by technology
At present, it is difficult to mechanically nanonize ductile materials such as magnesium-based compounds or added high-hardness materials, because the size of the grinding ball is not nano-scale and the relative size of the abrasive material is too large, so it is difficult to apply nano-scale stress in the above material
For ductile materials, although ball milling can destroy the material, the damaged material is prone to recrystallization into larger sizes, so it cannot effectively reduce its crystal size to nanoscale
In order to avoid the recrystallization phenomenon, it is known to use liquid nitrogen to reduce the ductility of ductile materials such as aluminum-based compounds, but the above cryogenic grinding process will increase the cost
Method used
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Embodiment 1
[0016] Take 0.7 g of magnesium (Weiss Enterprise Co., Ltd.), 0.3 g of FeTi (Shenmei Da International Development Co., Ltd.), and 0.01 g of carbon nanotubes (aldrich) to perform a ball milling process under argon. The grinding beads of the ball milling process are tungsten steel, the temperature is 27, the pressure is 1 atm, and the time is 6 hours. From XRD diffraction results and transmission electron microscope image analysis, it can be seen that the average crystal of Mg and Mg after ball milling is less than 100 nm. On the other hand, parameters such as pressure, hydrogen concentration, and temperature (Pressure-Concentration-Temperature) were measured to estimate the hydrogen storage rate. The results are as follows figure 1 shown.
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Abstract
The invention relates to a method for the nanocrystallization of a magnesium-based hydrogen storage material, which utilizes a nanocrystallization process for a nano-carbon material to prepare the magnesium-based hydrogen storage material to form monocrystal or polycrystal nano-particles so as to improve a specific surface area greatly and increase diffusion channels of hydrogen atoms in the hydrogen storage material. Therefore, the method can improve the effective hydrogen capacity of the hydrogen storage material, accelerate the hydrogen absorption and desorption of the hydrogen storage material, and reduce the temperature of the hydrogen absorption and desorption of the hydrogen storage material.
Description
technical field [0001] The present invention relates to a magnesium-based hydrogen storage material, more particularly, to a method for nanometering magnesium-based compounds. Background technique [0002] In the research of hydrogen storage materials, in order to increase the effective hydrogen storage capacity, accelerate the hydrogen absorption and desorption rate, and reduce the hydrogen absorption and desorption temperature, nanotization of materials is a new research direction. It is currently difficult to mechanically nanoscale ductile materials such as magnesium-based compounds or added high hardness materials because the size of the grinding balls is not nanoscale and the relative size of the grinding material is too large, so it is difficult to apply nanoscale stress. on the above materials. For ductile materials, although ball milling can destroy the material, the damaged material is easy to recrystallize into a larger size, so it cannot effectively reduce its cr...
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IPC IPC(8): C22C23/00C22F1/06C01B3/08B02C17/00
CPCY02E60/36
Inventor 颜佩珊黄军儒谷杰人陈斌豪郑名山曹芳海
Owner IND TECH RES INST