Mechanochemical activation of aluminum. 4. Kinetics of mechanochemical synthesis of aluminum carbide

With the aim of lowering the temperature, improve the kinetics of the decomposition of stoichiometric hydride MgH2 was investigated the possibility of its complex doping Al, Fe using mechanochemical synthesis (RMS). The MA1 sample was derived by reactive milling Mg + 10 wt% Al + 10 wt. % Fe powder mixture in the hydrogen atmosphere at pressure of 1.2 MPa in a reactor for 10 h. The formation (in conditions of mechanochemical synthesis) of hydride of solid solution of Al and Fe in magnesium Mg(Al,Fe)H2 was experimentally checked. Found that adding to magnesium Al & Fe leads to lower of thermodynamic stability and, consequently, to lower the temperature of the beginning of desorption of hydrogen to 250 0C at 0,1MPa H2 (compared to MgH2 without Al and Fe). After the first cycles of hydrogenation-dehydrogenation from gas phase MA, established by isobaric thermal desorption spectroscopy, the effect of lowering the temperature of the beginning desorbtion 315 0C (for non-alloy phase MgH2) to 250 0C was observed. Adding to magnesium aluminum with Fe significantly improves the kinetics of desorption of hydrogen from the hydride phase MgH2 mechanical alloy produced by RMS.

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Mechanochemical Activation of Aluminum: 3. Kinetics of Interaction between Aluminum and Water

Colloid Journal ◽

10.1007/s10595-005-0142-0 ◽

2005 ◽

Vol 67 (5) ◽

pp. 631-637 ◽

Cited By ~ 27

Author(s):

A. N. Streletskii ◽

I. V. Kolbanev ◽

A. B. Borunova ◽

P. Yu. Butyagin

Keyword(s):

Mechanochemical Activation ◽

Kinetics Of

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Kinetics of the mechanochemical synthesis of alkaline-earth metal amides

Chemical Physics Letters ◽

10.1016/j.cplett.2014.05.071 ◽

2014 ◽

Vol 608 ◽

pp. 80-83 ◽

Cited By ~ 12

Author(s):

Sebastiano Garroni ◽

Laszlo Takacs ◽

Haiyan Leng ◽

Francesco Delogu

Keyword(s):

Mechanochemical Synthesis ◽

Alkaline Earth ◽

Earth Metal ◽

Alkaline Earth Metal ◽

Metal Amides ◽

Kinetics Of

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Mechanochemical Synthesis of SiO44--Substituted Hydroxyapatite, Part I - Kinetics of Interaction between the Components

European Journal of Inorganic Chemistry ◽

10.1002/ejic.201402247 ◽

2014 ◽

Vol 2014 (28) ◽

pp. 4803-4809 ◽

Cited By ~ 22

Author(s):

Marina V. Chaikina ◽

Natalya V. Bulina ◽

Arcady V. Ishchenko ◽

Igor Yu. Prosanov

Keyword(s):

Mechanochemical Synthesis ◽

Kinetics Of

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Fracture, grinding, mechanical activation and synthesis processes in solids under mechanical action

Science of Sintering ◽

10.2298/sos0502093c ◽

2005 ◽

Vol 37 (2) ◽

pp. 93-105 ◽

Cited By ~ 5

Author(s):

M.V. Chaikina ◽

Sergej Aman

Keyword(s):

Mechanical Activation ◽

Mechanochemical Synthesis ◽

Mechanochemical Activation ◽

Mechanical Action ◽

Multicomponent Systems ◽

Chemical Changes

The parameters of mechanical action on solids were determined for apatite and quartz as examples, providing separation between fracture, grinding and mechanical activation processes in solids. The texture, structural and chemical changes accompanying these processes in the samples under investigation are shown. The data on mechanochemical synthesis of isomorphous apatite modifications in multicomponent systems are reported. A reversible character of mechanochemical activation and mechanochemical synthesis is discovered.

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MECHANOCHEMICAL SYNTHESIS OF FLUORIDATED HYDROXYAPATITE NANOPOWDER

International Journal of Modern Physics B ◽

10.1142/s0217979208047961 ◽

2008 ◽

Vol 22 (18n19) ◽

pp. 3099-3106 ◽

Cited By ~ 3

Author(s):

M. H. FATHI ◽

E. MOHAMMADI ZAHRANI

Keyword(s):

Grain Size ◽

Ftir Spectroscopy ◽

Mechanochemical Synthesis ◽

Ball Mill ◽

Rotation Speed ◽

Mechanochemical Activation ◽

Mechanochemical Reaction ◽

Fluoridated Hydroxyapatite ◽

Lower Solubility ◽

Bone Apatite

Recently fluoridated hydroxyapatite (FHA) has been developed since it possesses lower solubility than pure hydroxyapatite (HA), while maintaining the comparable bioactivity and biocompatibility in dental and orthopedic application. The aim of this work was to synthesize and characterize the FHA nanopowder via mechanochemical activation method. Mechanochemical reaction was performed in the planetary ball mill at 300 rpm rotation speed by using 8 balls with 2 cm diameter. XRD technique was used to evaluate phase and composition and determine the grain size of prepared FHA nanopowder. FTIR spectroscopy was utilized to identify the functional groups and to compare obtained powder with bone apatite. The results showed that the synthesis of FHA after 6 hr ball milling at 300 rpm was completed. Fluorhydroxyapatite grain size was almost 37nm after 6 hr of milling.

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