ELECTROSTATIC PRECIPITATION OF NANOPARTICLES AND SUBMICRON PARTICLES: REVIEW OF TECHNOLOGICAL STRATEGIES

Spherical submicron particles of materials produced by electrohydrodynamic (EHD) atomization have been used to study a variety of materials processes including nucleation of alternative crystallization phases in iron-nickel and nickel-chromium alloys, amorphous solidification in submicron droplets of pure metals, and quasi-crystal formation in nickel-chromium alloys. Some experiments on pure nickel, nickel oxide single crystals, the nickel/nickel(II) oxide interface, and grain boundaries in nickel monoxide have been performed by STEM. For these latter studies, HREM is the most direct approach to obtain particle crystal structures at the atomic level. Grain boundaries in nickel oxide have also been investigated by HREM. In this paper, we present preliminary results of HREM observations of NiO growth on submicron spheres of pure nickel.Small particles of pure nickel were prepared by EHD atomization. For the study of pure nickel, 0.5 mm diameter pure nickel wire (99.9975%) is sprayed directly in the EHD process. The liquid droplets solidify in free-flight through a vacuum chamber operated at about 10-7 torr.

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CLEANING USED MOTOR OIL FROM MICRON AND SUBMICRON PARTICLES IN SUPERCENTRIFUGE

10.32786/2071-9485-2019-01-35 ◽

2019 ◽

Keyword(s):

Submicron Particles ◽

Motor Oil ◽

Used Motor Oil

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SUBMICRON PARTICLES FORMATION BY CONDENASATION AT COALS BURNING. NUMERICAL SIMULATION

10.1615/ihtc16.cod.024068 ◽

2018 ◽

Author(s):

Leonid V. Petrov ◽

Naum Moiseevich Kortsenshteyn

Keyword(s):

Numerical Simulation ◽

Submicron Particles

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Preparation of MCrAlY–Al2O3 Composite Coatings with Enhanced Oxidation Resistance through a Novel Powder Manufacturing Process

Journal of Thermal Spray Technology ◽

10.1007/s11666-019-00830-y ◽

2019 ◽

Vol 28 (3) ◽

pp. 433-443 ◽

Cited By ~ 9

Author(s):

Mingwen Bai ◽

Bo Song ◽

Liam Reddy ◽

Tanvir Hussain

Keyword(s):

Oxidation Resistance ◽

Manufacturing Process ◽

Composite Powder ◽

Composite Coatings ◽

Submicron Particles ◽

Second Phase ◽

Mcraly Coatings ◽

Powder Feedstock ◽

Enhanced Oxidation ◽

Powder Manufacturing

Abstract MCrAlY–Al2O3 composite coatings were prepared by high-velocity oxygen fuel thermal spraying with bespoke composite powder feedstock for high-temperature applications. Powder processing via a suspension route was employed to achieve a fine dispersion of α-Al2O3 submicron particles on the MCrAlY powder surface. This was, however, compromised by ~ 50% less flowability of the feedstock during spraying. Nevertheless, the novel powder manufacturing process introduced in this study has shown potential as an alternative route to prepare tailored composite powder feedstock for the production of metal matrix composites. In addition, the newly developed MCrAlY–Al2O3 composite coatings exhibited superior oxidation resistance, compared to conventional MCrAlY coatings, with the formation of nearly exclusively Al2O3 scale after isothermal oxidation at 900 °C for 10 h. The addition of α-Al2O3 particles in the MCrAlY coatings as a second phase was found to have promoted the formation of YAG oxides (YxAlyOz) during spraying and also accelerated the outwards diffusion of Al, which resulted in enhanced oxidation resistance.

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