ball mill ti6al4v under hydrogen atmosphere

Characteristics of Ti6Al4V Powders Recycled from Turnings ...

by hydrogen (hydrogenation) imposes embrittlement leading to fracturing under mechanical loads (i.e., during ball milling), subsequent dehydrogenation provides some ductility as the result of outward diffusion of hydrogen. After dehydrogenation, powders must be kept under the protective atmosphere because of the oxidation affinity of the titanium.

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The effect of type of atmospheric gas on milling behavior ...

Mar 01, 2012  Recently fabrication of titanium alloys through solid state processes such as mechanical alloying has been greatly taken into consideration. In the present investigation the effects of common atmospheric impurities, oxygen and nitrogen, on the fabrication procedure and milling behavior of nanostructured Ti–6Al–4V alloy during mechanical alloying (MA) was studied.

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(PDF) The effect of type of atmospheric gas on milling ...

Table 11Milling parameters.Ball mill machine SPEX 8000 Rotation speed of vial (rpm) 610 Vial material Hardened Cr steel Vial capacity (ml) 40 Ball material Hardened carbon steel Diameter of balls (mm) 5 Number of balls 7 Ball to powder weight ratio 15:1 Total powder mass (g) 4 -8831/$ -see front matter Ó 2012 The Society of Powder Technology ...

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Effect of Reactive Ball Milling Time on the Hydrogenation ...

the hardened steel vial and sealed under He gas atmosphere. The vial was then filled with 50 bar of hydrogen gas atmosphere and mounted on the high energy ball mill. The milling process was interrupted after selected time (3, 6, 12.5, 25, 37.5 and 50 h) to get a small amount of the milled powders.

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Enhancement of the Hydr ogen-Storage Characterist ics of ...

prepared by milling in a hydrogen atmosphere in a planetary ball mill for 5 h. The Mg 2Ni was hydrided during milling in a hydrogen atmosphere. The 94MgH2+5Mg2Ni+1Ni had an effective hydrogen-storage capacity (the quantity of hydrogen absorbed for 60 min) of near 5 wt%. At n=1, the sample released 0.18 wt% for 2 min,

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Hydrogen Absorption and Release Properties of MgH , MgNi ...

hydrogen storage capacity of the material. A sample with a composition of 84 wt% Mg+10 wt% MgH2+5 wt% Mg2Ni+1wt% Ni (named the Mg-based sample) was prepared by milling under a hydrogen atmosphere in a planetary ball mill for 5 h. The hydrogen absorption and release properties of the prepared sample were investigated

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Probing the optimal thermohydrogen processing conditions ...

Nov 08, 2018  Typically, for each ball milling process, ca. 0.5 g hydrogenated Ti alloy shavings and 15 ZrO 2 balls (10 mm in diameter and density: 5.68 g/cm 3) with 46:1 ball to powder ratio (bpr) were put in a 100 mL zirconia vial. The vial was sealed in an Ar-filled glove box. The planetary ball-mill was operated at 301, 580, and 903 rpm, respectively.

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Over-Pressurization of Laboratory Ball Mill Hydrogen Tools

The over-pressurization of a laboratory ball mill reactor designed for operation under slightly elevated pressures resulted in a serious injury. The apparatus had been routinely operated under argon and hydrogen pressures of 5-10 atmospheres for nearly two years. The apparatus had not been tested for operation at pressures greater than 10 atm.

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Fabrication and microstructure of nanostructured Mg-3Ni ...

Nanostructured Mg-3Ni-2MnO2 was synthesized by ball milling elemental powders of Mg, Ni and MnO2 in hydrogen atmosphere. The microstructures of the powder prepared at different milling time were ...

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Kinetic analysis of Al 3Ti intermetallic powder after ...

The synthesis of the Mg2FeH6 complex hydride has been attempted by controlled reactive mechanical alloying (CRMA) of 2Mg–Fe powder mixture under hydrogen using shearing mode in a magneto-mill ...

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Isothermal hydrogenation kinetics of ball-milled nano ...

Mar 01, 2019  Before being processed in ambient atmosphere, samples were sealed in Argon. Magnesium hydride samples with and without catalyst, were milled via a custom-made ultrahigh-energy-high-pressure (UHEHP) ball milling device under a 150 bar hydrogen pressure, with a ball to powder ratio (by weight) of 110:1 .

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Effect of Reactive Ball Milling Time on the Hydrogenation ...

the hardened steel vial and sealed under He gas atmosphere. The vial was then filled with 50 bar of hydrogen gas atmosphere and mounted on the high energy ball mill. The milling process was interrupted after selected time (3, 6, 12.5, 25, 37.5 and 50 h) to get a small amount of the milled powders.

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Effect of Ball-Milling on the Properties of Mg {2}Cu ...

2Cu single phase which reacts reversibly with hydrogen. The other is prepared by ball millinga cast Mg 2Cu alloy. While the as-cast Mg 2Cu undergoes neither hydrogenationnor dehydrogenation under 3MPa of hydrogen in the temperature range of 300–773K, just an hour of ball milling activates the inert Mg 2Cu to react with hydrogen reversibly.

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Contamination Effects on Improving the Hydrogenation ...

into the hardened steel vial and sealed under He gas atmosphere [21]. The vial was then filled with 50 bar of hydrogen gas atmosphere and mounted on the high-energy ball mill. The milling process was interrupted after selected time (25, and 50 h) and the powders obtained after an

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Enhancement of the Hydr ogen-Storage Characterist ics of ...

prepared by milling in a hydrogen atmosphere in a planetary ball mill for 5 h. The Mg 2Ni was hydrided during milling in a hydrogen atmosphere. The 94MgH2+5Mg2Ni+1Ni had an effective hydrogen-storage capacity (the quantity of hydrogen absorbed for 60 min) of near 5 wt%. At n=1, the sample released 0.18 wt% for 2 min,

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Hydrogen Absorption and Release Properties of MgH ,

hydrogen storage capacity of the material. A sample with a composition of 84 wt% Mg+10 wt% MgH2+5 wt% Mg2Ni+1wt% Ni (named the Mg-based sample) was prepared by milling under a hydrogen atmosphere in a planetary ball mill for 5 h. The hydrogen absorption and release properties of the prepared sample were investigated

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(PDF) Hydride formation in ball-milled and cryomilled Mg ...

As an example, a yield as low as 50% has been reported for Mg 2 FeH 6 [9]. As an alternative, direct synthesis by ball milling elemental powders in a reactive hydrogen atmosphere has been proven to be successful for Mg 2 CoH 5 [13] and Mg 2 FeH 6 [8,14]. Ball milling in an inert Ar atmosphere was also shown to be important [15,16].

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Effect of BPR on the Preparation of Nb-Base Powder via ...

The mixtures of commercial SrH2 and Al powders were ball milled under hydrogen at a rotation speed of 150rpm for different time. The ball milled products could not be further hydrogenated to Sr2AlH7.

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Nanoscale Structures and Hydrogen Storage Capacity of Fe-C ...

2.1.2. Milling of Graphite Nanocrystals in a Hydrogen Atmosphere. An aliquot of 0.5g of graphite nanocrystals prepared as described in Section 2.1.1 was placed in a chromium steel mill pot (80cc) together with 20 steel balls (10mmϕ). Hydrogen gas was introduced at 1MPa, and then, the system was operated as a planetary ball mill at 400rpm for 80h.

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Structure and electrochemical hydrogen storage properties ...

International audienceThe structure and the electrochemical hydrogen storage properties of amorphous Ti2Ni alloy synthesized by ball milling and used as an anode in nickel–metal hydride batteries were studied. Nominal Ti2Ni was synthesized under argon atmosphere at room temperature using a planetary high-energy ball mill.

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Characterization of Hydrogen-Storage Properties and ...

In this work, 90 wt.% MgH2 + 5 wt.% Ni + 1.7 wt.% Zn(BH4)2 + 1.7 wt.% Ti + 1.7 wt.% Fe samples (named 90MgH2 + 5Ni + 1.7Zn(BH4)2 + 1.7Ti + 1.7Fe) were prepared by milling in a planetary ball mill in a hydrogen atmosphere. The fraction of additives was small (10 wt.%) in order to increase hydriding and dehydriding rates without decreasing the hydrogen storage capacity much.

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Nano Ball Milling - SlideShare

Dec 15, 2012  Ball milling of graphite under a hydrogen atmosphere is an effective method of producing nanostructured graphite which is able to store an appreciable amount of hydrogen. Nanostructured graphite has potential for use as a low-cost in energy store, for vehicles and stationary hydrogen-energy applications.

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Surface Texture-Based Surface Treatments on Ti6Al4V ...

Friction and wear tests were conducted using a ball-on-disk tribometer under dry sliding conditions at the applied loads of 0.3–5 N and a constant velocity of 0.1 m/s against a GCr15 steel ball with a diameter of 4 mm. Under a load of 5 N, polished Ti6Al4V substrate suffered severe adhesive wear and plough, the dimples on the LST-Ti6Al4V were ...

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Qian Peng, Xin Bin, Hao Pan, Yuehong Wang, Zhiwei Peng ...

Prior to sintering, 90% Ti6Al4V powder, 5 wt % HA powder, and 5 wt % TiB 2 powder were mixed and milled in a planetary ball mill (XQM-2, Miqi Technology Ltd., China) with the addition of extra 3 wt % stearic acid as a binder at a speed of 200 rpm for a period of 12 h in an argon atmosphere. The dosages of HA and TiB 2 were determined based on ...

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Fabrication of Boronized Ti6Al4V/HA Composites by ...

Prior to sintering, 90% Ti6Al4V powder, 5 wt % HA powder, and 5 wt % TiB 2 powder were mixed and milled in a planetary ball mill (XQM-2, Miqi Technology Ltd., China) with the addition of extra 3 wt % stearic acid as a binder at a speed of 200 rpm for a period of 12 h in an argon atmosphere.

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Characterization of hydrogen absorption/desorption states ...

rocking shaking ball-mill apparatus Seiwa Giken Co. Ltd., RM-10 under hydrogen H 2 and deuterium D 2 atmo-spheres, respectively. 300 mg graphite and 20 ZrO 2 balls with 8 mm in diameter were put into a milling vessel with the inner volume of about 30 cm3 made of Cr steel Ume-toku Co. Ltd., SKD-11 . Then, ball milling was performed under a 1.0 ...

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Effect of Ball-Milling on the Properties of Mg {2}Cu ...

2Cu single phase which reacts reversibly with hydrogen. The other is prepared by ball millinga cast Mg 2Cu alloy. While the as-cast Mg 2Cu undergoes neither hydrogenationnor dehydrogenation under 3MPa of hydrogen in the temperature range of 300–773K, just an hour of ball milling activates the inert Mg 2Cu to react with hydrogen reversibly.

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Nano Ball Milling - SlideShare

Dec 15, 2012  Ball milling of graphite under a hydrogen atmosphere is an effective method of producing nanostructured graphite which is able to store an appreciable amount of hydrogen. Nanostructured graphite has potential for use as a low-cost in energy store, for vehicles and stationary hydrogen-energy applications.

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Contamination Effects on Improving the Hydrogenation ...

into the hardened steel vial and sealed under He gas atmosphere [21]. The vial was then filled with 50 bar of hydrogen gas atmosphere and mounted on the high-energy ball mill. The milling process was interrupted after selected time (25, and 50 h) and the powders obtained after an

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Coatings Free Full-Text Electrophoretic Deposition of ...

In this paper, 45S5 Bioglass® coatings were elaborated by electrophoretic deposition (EPD) on the titanium alloy Ti6Al4V. An adequate grinding protocol was developed to obtain a stable suspension of submicrometric particles in isopropanol. The voltage and the deposition time of EPD were optimized. An optimal voltage of 30 V and two deposition times (30 and 90 s) were chosen to obtain two ...

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Mechanical alloying of Mg-33at.% Ni under hydrogen atmosphere

Oct 16, 2004  Me- chanical alloying was carried out using a vibrating frame high-energy ball mill (Spex 8000). At selected milling time, some amounts of milled powders were taken out for analysis, then the hydrogen was re- introduced into the vial to 1.0 MPa. For contrast, milling was also processed under argon atmosphere.

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METHOD OF MAKING ALKALI METAL HYDRIDES - Iowa State ...

16. The method of claim 1 wherein the alkali metal and hydrogen gas are reacted in the presence of the preformed alkali metal hydride powder in a ball mill. 17. The method of claim 16 wherein the ball mill is a magnetic ball mill. 18. The method of claim 16 wherein the ball mill is a planetary mill. 19.

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Characterization of Hydrogen-Storage Properties and ...

The fraction of additives was small (10 wt.%) in order to increase hydriding and dehydriding rates without decreasing the hydrogen storage capacity much. The hydrogen absorption and release properties of the prepared samples were investigated. 90MgH2 + 5Ni + 1.7Zn(BH4)2 + 1.7Ti + 1.7Fe had an effective hydrogen storage capacity of 5 wt.%.

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Mechanical Milling: a Top Down Approach for the Synthesis ...

Feb 03, 2012  A. Touzik et al[102] studied the structural transformations and amorphization of graphite upon high-energy ball-milling under argon and hydrogen atmosphere.Up to approximately 40% of the adsorbed nitrogen was stored in ultra micropores with diameter less than 0.8 nm and it was independent from milling atmosphere.

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INFLUENCE OF YTTRIUM OXIDE NANO- PARTICLES IN

Nano-composites of Ti6Al4V/Y 2 O 3 and alloy of titanium preforms were fabricated by using powder metallurgy method. Three major steps of powder metallurgy were followed for fabricating nano-composites such as blending, cold compaction and sintering. The ball mill was used to mix the Ti6Al4V and Y 2 O 3 powders for the period of 1 hour.

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Characterization of Hydrogen-Storage Properties and ...

+1.7Ti+1.7Fe) were prepared by milling in a planetary ball mill in a hydrogen atmosphere. The fraction of additives was small (10 wt.%) in order to increase hydriding and dehydriding rates without decreasing the hydrogen storage capacity much. The hydrogen absorption and release properties of the prepared samples were investigated. 90MgH 2

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