Problems and prospects of investigating the formation and evolution of agglomerates by the sampling method

Глотов, О. Г.; Зарко, В. Е.; Карасев, В. Е.

doi:10.1007/bf02701523

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…Experimental results [17] have shown that the oxide-spherule diameter depends on the burningparticle size (see Fig. 5).…”

Section: Al 2 O 3 Spherule Sizementioning

confidence: 93%

“…9. Ratio of the radius r of a burning Al particle to the halo radius Rreac as a function of the Al particle radius (points) [17]; the solid curve is a solution of Eqs. (18) and (19).…”

Section: Videorecording Of Al and Ti Droplet Combustion In Airmentioning

confidence: 99%

“…where ϕ = r/R reac is the experimentally measured [17] ratio of the radii of the burning droplet and the reaction zone (see Fig. 9).…”

Section: Al 2 O 3 Spherule Sizementioning

confidence: 99%

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Formation of metal oxide nanoparticles in combustion of titanium and aluminum droplets

Карасев

Onishchuk

Khromova

et al. 2006

Combust Explos Shock Waves

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A study was performed of the formation of metal oxide nanoparticles during combustion of aluminum and titanium drops which moved in air at a velocity of up to 3 m/sec. The source of the burning particles was a pyrotechnic mixture which contained an oxidizer, a binder, and metal particles of size 4-350 µm. Transmission electron microscopic studies showed that the combustion products were 1-10 µm aggregates of fractal structure consisting of primary particles (spherules) of Al 2 O 3 /TiO 2 5-150 nm in diameter. The Brownian diffusion of the aggregates and their motion in electric and gravitational fields were observed using videomicroscopic recording. The charge distribution of TiO 2 aggregates and the equivalent radius of Brownian mobility were determined. In Al combustion, the zone of nanoparticle formation is separated from the particle surface by a distance approximately equal to the particle radius, and in Ti combustion, this zone is located directly near the surface. Coagulation of the oxide aerosol in the track of a burning particle leads to aerogelation with the formation of huge aggregates. Analytical expressions for approximate calculation of the parameters of the oxide particles and zones of their formation are proposed.

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“…Experimental results [17] have shown that the oxide-spherule diameter depends on the burningparticle size (see Fig. 5).…”

Section: Al 2 O 3 Spherule Sizementioning

confidence: 93%

“…9. Ratio of the radius r of a burning Al particle to the halo radius Rreac as a function of the Al particle radius (points) [17]; the solid curve is a solution of Eqs. (18) and (19).…”

Section: Videorecording Of Al and Ti Droplet Combustion In Airmentioning

confidence: 99%

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Formation of metal oxide nanoparticles in combustion of titanium and aluminum droplets

Карасев

Onishchuk

Khromova

et al. 2006

Combust Explos Shock Waves

Self Cite

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“…Consequently, large agglomerates form, the so called coarse oxidation products in condensed combustion products (CCPs) [ 1 , 3 , 4 , 5 ]. Many researchers [ 3 , 6 , 7 ] have focused on the CCPs of propellant. They have found that it determines the values of two phase losses, which can reduce examined I sp as high as 3–5% [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Polytetrafluoroethylene Coated Micron Aluminium with Enhanced Oxidation

et al. 2020

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Aluminium (Al) powders of micron size are widely applied to energetic materials as a high energy fuel. However, its energy conversion efficiency is generally low due to low oxidation activity. In this paper, a polytetrafluoroethylene (PTFE) coating layer with both protection and activation action was successfully introduced onto the surface of Al via adsorption and following heat treatment. The preparation conditions were optimized and the thermal activity of this core-shell composite material was studied. The potential enhancement mechanism for Al oxidation was proposed. The results showed that PTFE powders deformed into membrane on the surface of Al after the sintering process. This polymer shell could act as an effective passivation layer protecting internal Al from oxidation during aging. The reduction in metallic Al of Al/PTFE was decreased by 84.7%, more than that in original spherical Al when the aging time is 60 days. Moreover, PTFE could react with Al resulting in a thin AlF3 layer, which could promote the destruction of Al2O3 shell. Thus, PTFE could enhance oxidation activity of micro-Al. The conversion of Al was increased by a factor of 1.8 when heated to 1100 °C. Improved aging-resistant performance and promoted oxidation activity of Al could potentially broaden its application in the field of energetic materials.

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Method of Model Agglomerates and Its Application to Study the Combustion Mechanisms of Al, Al+B, and Ti Particles

Глотов

2020

Innovative Energetic Materials: Properties, Combustion Performance and Application

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Problems and prospects of investigating the formation and evolution of agglomerates by the sampling method

Cited by 9 publications

References 6 publications

Formation of metal oxide nanoparticles in combustion of titanium and aluminum droplets

Formation of metal oxide nanoparticles in combustion of titanium and aluminum droplets

Fabrication of Polytetrafluoroethylene Coated Micron Aluminium with Enhanced Oxidation

Method of Model Agglomerates and Its Application to Study the Combustion Mechanisms of Al, Al+B, and Ti Particles

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