The Structure and Phase Composition of the Cermet Charge in the Al–Al2O3 System Obtained Using Mechanical Processing of Aluminum Powder in a Planetary Ball Mill

2021 ◽  
Author(s):  
D. A. Ivanov ◽  
G. E. Val’yano ◽  
T. I. Borodina
Keyword(s):  
Phase Composition ◽  
Aluminum Powder ◽  
Ball Mill ◽  
Planetary Ball Mill ◽  
Mechanical Processing

The structure and phase composition of the cermet charge in the Al‒Al2O3 system obtained using mechanical processing of aluminum powder in a planetary ball mill

2021 ◽  
pp. 31-38
Author(s):  
D. A. Ivanov ◽  
G. E. Val'yano ◽  
T. I. Borodina
Keyword(s):  
Aluminum Powder ◽  
Amorphous Carbon ◽  
Ball Mill ◽  
Bending Strength ◽  
Exothermic Reaction ◽  
Planetary Ball Mill ◽  
Mechanical Processing ◽  
Aluminum Particles ◽  
Industrial Grade ◽  
The Impact

The cermet charge in the Al‒Al2O3 system was obtained by mechanical processing (MP) in a planetary ball mill of aluminum powder of the industrial grade PAP-2 (GOST 5494‒95), consisting of flake particles of submicron thickness with a coating of stearin. Depending on the MP modes used, 4 types of charge were obtained, the bulk density of which varied from 0,33 to 1,1 g/cm3. For all types of charge, the synthesis of the α-Al2O3 phase was observed as a result of the exothermic reaction of the interaction of air oxygen with the surface of aluminum particles during the MP. It is also possible to form boehmite and gibbsite when the activated surface of Al particles interacts with atmospheric water vapor. The local X-ray spectral analysis (EDX) was used to detect X-ray amorphous carbon in the composition of the charge, the appearance of which is associated with the impact- shearing effect of grinding bodies, leading to the nucleation of X-ray amorphous carbon inclusions due to the termal destruction of stearin. The maximum bending strength of the sintered cermet was 550 MPa. This cermet is characterized by a discrete fracture: the formation of dimples as a result of the shear of layered packets under the action of tangential stresses. The revealed mechanisms cermet’s fractures allow us to establish the optimal modes of MP of powder compositions for obtaining various constructional elements from them.

scholarly journals Phase Composition and Magnetic Behaviour of Iron Sand from Syiah Kuala Beach Prepared by Mechanical Alloying

2016 ◽  
Vol 4 (01) ◽  
pp. 110 ◽  
Author(s):  
Zulkarnain Jalil ◽  
Eva Novita Sari ◽  
Ismail A B ◽  
Erfan Handoko
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Ball Mill ◽  
Magnetic Behavior ◽  
Magnetic Behaviour ◽  
Planetary Ball Mill ◽  
Magnetization Saturation ◽  
Banda Aceh

<span>It has recently been investigated that ball milling can improve the magnetic properties of natural <span>iron sand significantly. In this work, we present the phase composition and magnetic behavior of <span>iron sand from Syiah Kuala Beach, Banda Aceh. Samples were prepared by mechanical alloying <span>method using a Fritsch planetary ball mill for 20 hours. As the results, it was shown by XRD test<br /><span>that Fe<span>3<span>O<span>4 <span>(magnetite) appears as the majority phase and the magnetic properties observation <span>shown that the magnetization saturation (Ms) and remanent (Br) was decreased with the increasing <span>of the coercivity (Hc).</span></span></span></span></span></span><br /></span></span></span></span></span>

Fast, solvent-free and highly enantioselective fluorination of β-keto esters catalyzed by chiral copper complexes in a ball mill

2017 ◽  
Vol 19 (7) ◽  
pp. 1674-1677 ◽  
Author(s):  
Yifeng Wang ◽  
Haojiang Wang ◽  
Yidong Jiang ◽  
Cheng Zhang ◽  
Juanjuan Shao ◽  
...  
Keyword(s):  
Ball Mill ◽  
Copper Complexes ◽  
Solvent Free ◽  
Planetary Ball Mill ◽  
Keto Esters ◽  
Solvent Free Conditions

A fast and highly enantioselective fluorination of β-keto esters catalyzed by diphenylamine linked bis(oxazoline)-Cu(OTf)2 complexes under solvent-free conditions has been developed using a planetary ball mill.

scholarly journals Production of Ultrafine Particles by Continuous Planetary Ball Mill.

1991 ◽  
Vol 38 (2) ◽  
pp. 66-69
Author(s):  
Kantaro KANEKO ◽  
Mutsuhiro KAWASHIMA
Keyword(s):  
Ball Mill ◽  
Ultrafine Particles ◽  
Planetary Ball Mill

scholarly journals Analysis of early-stage sintering mechanisms of mechanically activated BaTiO3

2006 ◽  
Vol 38 (3) ◽  
pp. 239-244 ◽  
Author(s):  
M.V. Nikolic ◽  
V.P. Pavlovic ◽  
V.B. Pavlovic ◽  
M.M. Ristic
Keyword(s):  
Barium Titanate ◽  
Temperature Interval ◽  
Ball Mill ◽  
Early Stage ◽  
Planetary Ball Mill ◽  
Heating Rates ◽  
Barium Titanate Powder ◽  
Powder Samples ◽  
Sintering Mechanisms

Barium-titanate powder was mechanically activated in a planetary-ball mill for 60 and 120 minutes. Non-isothermal sintering of non-activated and activated powder samples was investigated using a dilatometer in the temperature interval from room to 1380oC with three different heating rates (10, 20 and 30oC/min). Early-stage sintering mechanisms for all three types of samples were analyzed, showing significant differences between the non-activated and mechanically activated samples.

Antistatic Composite Coаtings on the Basis of Powder Paints

2014 ◽  
Vol 1040 ◽  
pp. 3-7
Author(s):  
Sergey Panin ◽  
Sergey Y. Yazykov ◽  
Boris Ovechkin
Keyword(s):  
Magnesium Alloy ◽  
Functional Properties ◽  
Powder Mixture ◽  
Ball Mill ◽  
Outer Space ◽  
Planetary Ball Mill ◽  
Static Electricity ◽  
Protective Function ◽  
Electrostatic Deposition ◽  
Space Conditions

For operating under outer space conditions besides providing originally specified protective function, coating should often ensure accomplishment of functional properties, for instance conductivity of electric current. The solution of this problem can be reached by adding powder fillers with specified functional properties into powder paint. The paper deals with development of technique for formation of protective conducting coatings by filling powder paints and treatment in planetary ball mill. For protection of magnesium alloy shells the technique is offered which combines formation of the oxidized sublayer, introduction of electroconductive filler, treatment of the powder mixture in the planetary ball mill and electrostatic deposition of sifted mixture of definite dispersion. This allows sinking of static electricity from cabinets of the equipment for the space-crafts applications in conditions of the outer space.

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