Fabrication and microstructure of nanostructured Mg-3Ni-2MnO2 by ball milling in hydrogen atmosphere

2009 ◽  
Vol 19 ◽  
pp. s359-s362 ◽  
Author(s):  
Wen-bin FANG ◽  
Wa FANG ◽  
Hong-fei SUN ◽  
Zhen-xing YU
Keyword(s):  
Ball Milling ◽  
Hydrogen Atmosphere ◽  
Milling In Hydrogen

Amelioration of Hydrogen Uptake and Release Features of Magnesium Adding a Polymer Polyvinylidene Fluoride via Milling in Hydrogen in a Planetary Ball Mill

2020 ◽  
Vol 20 (11) ◽  
pp. 7105-7113
Author(s):  
Young Jun Kwak ◽  
Myoung Youp Song
Keyword(s):  
Ball Milling ◽  
Ball Mill ◽  
Polyvinylidene Fluoride ◽  
Hydrogen Uptake ◽  
Hydrogen Atmosphere ◽  
Hydrogen Release ◽  
Planetary Ball Mill ◽  
Planetary Ball Milling ◽  
Milling In Hydrogen ◽  
Uptake And Release

In the present study, a polymer polyvinylidene fluoride (PVDF) was chosen as an adding material to ameliorate hydrogen uptake and release features of Mg. Samples with a composition of 95 wt.% Mg+5 wt.% PVDF (called 95Mg + 5PVDF) were made via milling in hydrogen atmosphere in a planetary ball mill (reactive planetary ball milling). The hydrogen release reaction of magnesium hydride formed in the as-prepared 95Mg+5PVDF during reactive planetary ball milling started at 681 K. In the third cycle (CN = 3), the amount of hydrogen absorbed for 60 min, A (60 min), was 3.44 wt.% hydrogen at 573 K in 12 bar hydrogen. The PVDF is believed to have melted during reactive planetary ball milling, and the sliding or lubrication between Mg particles and hardened steel balls was avoided, leading to a good contact between them and a highly effective milling. The milling in hydrogen atmosphere in a planetary ball mill of Mg with PVDF is believed to have generated defects and cracks. The Mg2C3 produced from PVDF during hydrogen uptake-release cycling is believed to have been spread among particles and to have kept particles from coalescing. To the best of our knowledge, this is the first study to use a polymer PVDF as an additive material for the amelioration of hydrogen uptake and release features of Mg.

Preparation and Microstructure of Nanocomposite Mg-3Al-Zn Alloy by HDDR Combined with Ball Milling

2011 ◽  
Vol 264-265 ◽  
pp. 496-501
Author(s):  
Hong Fei Sun ◽  
Wa Fang ◽  
Zhen Xing Yu ◽  
Wen Bin Fang
Keyword(s):  
Ball Milling ◽  
Structural Changes ◽  
Average Crystallite Size ◽  
Hydrogen Atmosphere ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Milling In Hydrogen ◽  
Average Size ◽  
Zn Alloy

Nanocrystallite Mg-3Al-Zn alloy was synthesized by ball milling of elemental powders of Mg, Al and Zn under hydrogen atmosphere. The powders of Mg, Al and Zn were mechanical alloying and disproportionated by ball milling under hydrogen and desorption-recombination was then performed. The structural changes due to both the milling in hydrogen and the subsequent desorption-recombination treatment were characterized by X-ray diffraction (XRD). The desorption–recombination behavior of the hydrogenation alloy was investigated by differential scanning calorimetry (DSC). The morphology and microstructure of the final alloy powders subject to desorption–recombination treatment were observed by TEM and HRTEM, respectively. The results showed that, by milling in hydrogen for 60 h, the Mg-3Al-Zn alloy was disproportionated into nano-structured with average size of about 60-70 nm, and a subsequent desorption–recombination treatment at 320°C for 30 min alloy didn’t vary the average crystallite size of powders.

Hydrogenation Of The Titanium Aluminides

2008 ◽  
Vol 1098 ◽  
Author(s):  
Nataiya Kazantseva ◽  
Nikolai V Mushnikov ◽  
Alexandr G Popov ◽  
Valentina A Sasonova ◽  
Pavel B Teren'ev
Keyword(s):  
Crystal Structure ◽  
Phase Transformations ◽  
Ball Milling ◽  
Hydrogen Absorption ◽  
Room Temperature ◽  
Titanium Aluminides ◽  
Hydrogen Atmosphere ◽  
Absorption Properties ◽  
Milling In Hydrogen

AbstractThe hydrogen absorption properties of the Ti-Al-Nb system intermetallics subjected by ball milling were studied. It was found that the hydrogenation of the titanium aluminides during ball milling in hydrogen atmosphere could occur at room temperature without any special requirements to the quality of hydrogen. The crystal structure of the hydrides and phase transformations were also studied.

scholarly journals Electrode properties of a double layer capacitor of nano-structured graphite produced by ball milling under a hydrogen atmosphere

Carbon ◽  
2006 ◽  
Vol 44 (5) ◽  
pp. 983-988 ◽  
Author(s):  
Emi Gomibuchi ◽  
Takayuki Ichikawa ◽  
Koichi Kimura ◽  
Shigehito Isobe ◽  
Koji Nabeta ◽  
...  
Keyword(s):  
Ball Milling ◽  
Double Layer ◽  
Hydrogen Atmosphere ◽  
Double Layer Capacitor

scholarly journals Magnesium–carbon hydrogen storage hybrid materials produced by reactive ball milling in hydrogen

Carbon ◽  
2013 ◽  
Vol 57 ◽  
pp. 146-160 ◽  
Author(s):  
M. Lototskyy ◽  
J.M. Sibanyoni ◽  
R.V. Denys ◽  
M. Williams ◽  
B.G. Pollet ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Ball Milling ◽  
Hybrid Materials ◽  
Milling In Hydrogen

Preparation of La-Mg-Ni Hydrogen Storage Composite Alloys by Mechanical Alloying

2013 ◽  
Vol 807-809 ◽  
pp. 2707-2712 ◽  
Author(s):  
Shi Jian Yan ◽  
Xin Wei Zou ◽  
Min Gang Zhang
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Metal Powder ◽  
Hydrogen Desorption ◽  
Hydrogen Atmosphere ◽  
Hydrogen Storage Alloys ◽  
Milling Parameters ◽  
Multi Phase ◽  
Mg Content

LaNi5-xwt%Mg hydrogen storage alloys with different Mg content were made from pure La, Mg and Ni metal powder by mechanical alloying, selecting appropriate ball-milling parameters in 0.4MPa hydrogen atmosphere. The characterizations for hydrogen storage alloy show that a multi-phase alloy composed of MgH2, LaH3, Mg2NiH4 and Ni was obtained, the alloy have two hydrogen desorption temperature range, and the alloy with 25wt% Mg content can desorb hydrogen up to 4.02wt%.

scholarly journals Improvement in the Hydrogenation and Dehydrogenation Features of Mg by Milling in Hydrogen with Vanadium Chloride

2021 ◽  
Vol 59 (10) ◽  
pp. 721-729
Author(s):  
Myoung Youp Song ◽  
Seong Ho Lee ◽  
Young Jun Kwak
Keyword(s):  
Solid Solution ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Hydrogen Atmosphere ◽  
Starting Material ◽  
Hydrogen Storage Capacity ◽  
Reactive Milling ◽  
Nucleation Sites ◽  
Milling In Hydrogen ◽  
Vanadium Chloride

VCl3 (vanadium (III) chloride) was selected as an additive to Mg to increase the hydrogenation and dehydrogenation rates and the hydrogen storage capacity of Mg. Instead of MgH2, Mg was used as a starting material since Mg is cheaper than MgH2. Samples with a composition of 95 wt% Mg + 5 wt% VCl3 (named Mg-5VCl3) were prepared by milling in hydrogen atmosphere (reactive milling). In the first cycle (n=1), Mg-5VCl3 absorbed 5.38 wt% H for 5 min and 5.95 wt% H for 60 min at 573 K in 12 bar hydrogen. The activation of Mg-5VCl3 was completed after three hydrogenation-dehydrogenation cycles. During milling in hydrogen, β-MgH2 and γ-MgH2 were produced. The formed β-MgH2 and γ-MgH2 are considered to have made the effects of reactive milling stronger as β-MgH2 and γ-MgH2 themselves were being pulverized. The introduced defects and the interfaces between the Mg and the phases formed during the reactive milling and during hydrogenation-dehydrogenation cycling are believed to serve as heterogeneous active nucleation sites for MgH2 and Mg-H solid solution. The phases generated during hydrogenation-dehydrognation cycling are also believed to prevent the particles from coalescing during hydrogenation-dehydrognation cycling.

Sign in / Sign up

Export Citation Format

Share Document