Fig. 1 shows the XRD patterns of Mg 50 Co 50 alloys ball milled with various durations-0.5, 2, 5, 10, 25, 30, 35, 40, 45, 50, 75, 100, 200, 300 and 400 h. The phase information of the samples after ball milling based on XRD measurement is shown in Table 1.The starting sample is mixture of 300 mesh Co with hexagonal close packed (HCP) structure and 100 mesh …
The results reveal that the thermite reaction of WO 3 and Mg is almost complete after 5 min of ball milling at a speed of 300 rpm. The average grain size of the tungsten powder …
They observed a gradual decrease in particle size when the samples were milled at 200 and 300 rpm, attributing it to the collisions between the balls and alloy particles during milling. ... After 50 and 100 h of ball milling, the mean particle size was 300 μm and 60 μm, respectively. ... Esguerra-Arce J. The evolution of the microstructure ...
According to the XRD data shown in Fig. 1, reactive ball milling of Mg powder under hydrogen pressure leads to complete hydrogenation of magnesium and formation of 2 phases of MgH 2, i.e. β-MgH 2 and a highpressure modification γ-MgH 2.However, for the magnesium with 5 wt.% of TiC–2TiB 2 additive, ball-milled in hydrogen, the peaks of unreacted Mg were present …
proportion of the ball-milled sample raising from 150 to 200 wt% the initial discharge was raised from 770 to 1200 mAh/g. In this work, the CeMg ... 300 mg milled alloys powders were poured into the cylindrical reactor. Hydrogen des- ... 2Ni nearly vanish for ball milling. The MgH 2, Mg 2Ni and CeH 3 phases form after hydrogen absorption, as
Reactive ball milling. Reactive ball milling method is to mill starting materials under various gas atmospheres. In hydrogen storage research field, this method is used to synthesize hydrides of metals and alloys at low temperature by milling under certain hydrogen pressure, to form metal hydrides whose alloy phase is not stable (e.g., Mg 2 FeH 6 [27,28]), and to design and …
In this paper, we applied ball milling technique to prepare amorphous and nanocrystalline CeMg 11 Ni + x wt.% Ni (x = 100, 200) alloys which gaseous and electrochemical hydrogen storage dynamics and structure characteristics were systematically studied. It is shown that increasing Ni proportion promotes the amorphization of alloys, meanwhile, it improves their …
Ball milling is a feasible and promising method of biochar modification that can significantly increase its adsorption ability to methylene blue (). ... 40, 60, 80, 100, 150, 200, 300, 500 mg/L). The adsorption conditions were the same as before, and Ce and Qe were determined after the adsorption was complete (24 h). In the early adsorption ...
The effect of ink ball milling time on interparticle interactions and ink microstructure and their influence on crack formation in rod-coated catalyst layers ... milled for 24 h contained the lowest average surface crack area percentages of 0.370% at heavy-duty loadings of ∼0.300 mg Pt cm ... at 200–1,000× magnifications with an ...
200–300 mg of starch samples were placed in a rotating cylinder of 4 mm diameter and recorded with a spectrometer (AVANCE III 500, Bruker Ltd., Karlsruhe, Germany). The number of scans was 3000 and the interval between cycles was 2 s. ... Under ball milling pretreatment conditions ...
In this work, nine nanocrystalline binary Mg alloys were synthesized by high-energy ball milling. The compositions, Mg-5 wt% M (M-Cr, Ge, ... were consolidated under uniaxial pressure of 200 MPa at 300°C in a WC die of 10 mm diameter using SPS machine (Thermal
One more widely used activation method is the preparation of composite powder materials by ball milling of Al and Mg with various ... (up to 200 rpm) imposed rather a small impact on the milling process as compared to 300–700 rpm . A larger ball-to-powder mass ratio provided more extensive milling and contributed to particle size ...
Whereas for Mg-carbon black it takes place in a relatively narrow temperature range, expressed by a single exothermic peak (200-300 C) for the other two composites the hydriding is a multi-step process, featured by two overlapped exothermic peaks for Mg-nanodiamonds and by two well separated exothermic effects (at about 300 C and 400 C) for …
Ball milling is a feasible and promising method of biochar modification that can significantly increase its adsorption ability to methylene blue (). This study synthesized nine …
Ball milling is a simple and effective processing technique that induces structural, morphological and microstructural modification of materials by energetic impacts (balls to balls and balls to …
High-temperature, high-pressure reactive planetary ball milling is applied for the synthesis of Mg 2 NiH 4. Elevated temperature promotes the formation of MgH 2 and Mg 2 NiH …
Functionalization-assistant ball milling towards Si/graphene anodes in high performance Li-ion batteries. ... (25 mg) and f-graphene (100 mg) were dispersed homogeneously in N, N-dimethylformide (99%, Sigma-Aldrich) and milled continuously for 4 h using a planetary mill (with zirconia balls and poly (tetrafluoroethylene)). The resultant black ...
Hydriding/dehydriding Hydrogen storage capacity Hydriding kinetics a b s t r a c t MgH 2 75 at.%eC 25 at.% composites are synthesized by ball milling using different kinds of carbon additives: carbon black (CB), nanodiamonds (ND) and amorphous carbon
The work on the effect of different kinds of carbon on the hydrogen sorption of Mg–C composites, prepared by ball milling, has been intensive during the last years. ... (200–300 °C) for the other two composites the hydriding is a multi-step process, starting at about 200 °C. The observed difference in the hydriding behavior of the present ...
Linear polarization curves of composite alloy electrodes ball-milled for different times at 50% DOD and 303 K. cle size of composite alloys has been reduced with the increase of ball-milling time, and then much fresh surface and/or interface is formed in …
Important issue of the present study is also the low temperature hydriding of the ball-milled Mg-C nanocomposites, investigated by high-pressure DSC. The process starts at …
(a) Piezocatalysis utilising ball milling with 0.6 g BV and a control sample at 100, 200, and 300 rpm (b) comparison between the effectiveness of piezocatalysis using ball milling for 40 min and piezocatalysis using ultrasonication for 180 min, with and without a sample (c) study for different scavenger effects using 0.6 g BV powders in ...
The ball milling procedure was carried out at 200, 300, or 500 rpm for 0.05 to 12 h. Every 30 min, the milling procedure was stopped for 15 min and the rotation direction was altered – the total time reported does not include the time for which the ball mill was stopped. ... The capacity increased from 9–25 mg/g before ball milling to 81 ...
It was found that there was a positive relationship between ball milling speed (200–300 rpm) and layers of graphene nanosheets achieving the highest graphene conversion efficiency at a speed of 300 rpm .
In contrast to traditional doping and milling Mg powders with Zr 2 Ni powders using tool steel balls, our proposed in-situ gradual doping Mg was successfully achieved upon using Zr 2 Ni-balls milling media ball milling. This new catalyzation process has shown mutually beneficial for overcoming the agglomeration of catalytic agent in Mg matrix.
Mg-10 wt% Al alloy was produced by high-energy ball milled and subsequent spark plasma sintering at four temperatures (200, 250, 300, and 350 °C). The phase analysis, microstructure, hardness, density, and corrosion behavior of the alloy after spark plasma sintering at four temperatures were investigated.
Besides, ball milling treatments of MCC with different rotational speeds of the ball mill (200 rpm, 300 rpm, 400 rpm, and 500 rpm) and different filling dosages of MCC (1.0 g, 2.0 g, 3.0 g, 4.0 g, and 5.0 g) were also performed through similar procedures. ... Switzerland). Every sample (5–8 mg) was heated from 30 to 800 °C with a heating ...
This study focuses on the preparation of a Mg 2 Ni hydrogen storage alloy through high-energy ball milling, further enhanced by composite graphene and multi-walled carbon nanotubes (MWCNTs) modification. It is evident that high-energy ball milling successfully incorporates graphene and MWCNTs onto the surface of Mg 2 Ni particles. This process not …
TEM images of the as-fabricated CNT/Al–Cu–Mg composite milled at: (a) 200 rpm/6 h; (b) 300 rpm/4 h; (c) 600 rpm/2 h, (d) the typical high-resolution TEM image of CNTs/Al interface. ... The Schmid factor of the composites subjected to a ball milling speed of 300 rpm/3 h was determined to be lower compared to those processed at 200 rpm/6 h ...
Mg alloy milling was performed under 5 bar of H 2 or Ar at room temperature in a (i) "low-energy" (maximum rotation speed of 200 rpm) milling device Uni-Ball-Mill II, from Australian Scientific Instruments, with a double magnet in the bottom vertical position (subsequently named UB) and (ii) "high-energy" (maximum rotation speed of 600 ...
The as-cast La 2 Mg 17 with different amount of Ni powders were mixed through ball milling to produce a new type of La 2 Mg 17 –x wt.% Ni (x = 50, 100, 150, 200) alloy. The microstructures of the alloys were characterized by XRD technique, the results show that the crystal structure transfers to amorphous one with the increasing amount of Ni powders.