Ignition, combustion, and agglomeration of encapsulated aluminum particles in a composite solid propellant. II. Experimental studies of agglomeration

Глотов, О. Г.; Yagodnikov, D. A.; Воробьев, В. С.; Зарко, В. Е.; Симоненко, В. Н.

doi:10.1007/s10573-007-0045-y

Cited by 63 publications

(16 citation statements)

References 13 publications

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“…The benefits of including fluorinated oxidizers in systems involving aluminum combustion were discussed previously [12]. In many recent studies, fluoropolymers were combined with aluminum as oxidizers, e. g., [13][14][15][16] or additives to oxidizers or coatings [17,18]. However, the initiation of such aluminumfluoropolymer systems is significantly more difficult than that of a nanothermites.…”

Section: Introductionmentioning

confidence: 99%

Combustion of Aluminum‐Metal Fluoride Reactive Composites in Different Environments

Valluri

Schoenitz

Dreizin

2019

Propellants Explo Pyrotec

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Combustion of two nanocomposite powders comprising equal mass fractions of aluminum and a metal fluoride, BiF3 or CoF2, is characterized experimentally. The powders were prepared by arrested reactive milling; earlier work showed that they are readily ignited upon heating and are insensitive to ignition by electrostatic discharge. Here, powder particles were ignited in air by passing through a focused CO2 laser beam. They were also ignited and burned in oxygen‐starved environments produced in the combustion products of an air‐acetylene and air‐hydrogen flames. Burn times and color temperatures of the particles were measured optically. Combustion products were collected and examined using electron microscopy. Correlations of burn times with particle sizes showed that the composites containing BiF3 burned faster than those containing CoF2. In air, the burn rates of both composite powders exceeded that of pure Al; in the oxygen‐starved environments the burn rates of the prepared composites were comparable to that of Al. The flame temperatures of the CoF2‐containing composite were limited by the Al boiling point while BiF3 containing composites burned at higher temperatures. Combustion mechanisms for the prepared materials are discussed qualitatively.

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Section: Introductionmentioning

confidence: 99%

Combustion of Aluminum‐Metal Fluoride Reactive Composites in Different Environments

Valluri

Schoenitz

Dreizin

2019

Propellants Explo Pyrotec

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“…Very recently, experiments with iron-coated Al particles have shown that such particles ignite at a surface temperature 1600-1700 K and hence could also be used for propulsion applications [79]. Finally, it is worthwhile to investigate nonmetal coatings, such as fluorinecontaining polymers [80][81][82] and complex fluorides [83], as methods to facilitate ignition of Al particles in CO 2 atmosphere.…”

Section: Resultsmentioning

confidence: 99%

Metal-CO2 Propulsion for Mars Missions: Current Status and Opportunities

Shafirovich

Varma

2008

Journal of Propulsion and Power

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“…3). The confidence interval Δ is estimated by means of a reproducibility test [3] for a confidence probability of 68%. As is evident in Fig.…”

Section: Morphology Size and Number Of Sampled Particlesmentioning

confidence: 99%

The evolution of 100-µm aluminum agglomerates and initially continuous aluminum particles in the flame of a model solid propellant. II. Results

Глотов

Жуков

2008

Combust Explos Shock Waves

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A quenching/sampling method was used to study the evolution of monodisperse 100-μm aluminum agglomerates and continuous particles in the flame of combustion products -composite propellant at a pressure of 0.7-8 MPa. The particle residence time in the flame was varied in the range 6-170 msec, whereas the calculated time of their combustion was ≈25 msec. The evolution of a burning particle is related to the consumption of metallic aluminum and the deposition of oxide in the form of a cap, which, after complete combustion of aluminum, is transformed to the final spherical oxide particle. The density of the final oxide particles was measured. The ratio of the diameters and masses of the initial metal particle and the final oxide particles was determined. Data on particle fragmentation during combustion were obtained by comparing the numbers of the initial metal particles and the final oxide particles. Considerable differences in the combustion behavior of the agglomerates and continuous particles of size 100 μm were not found. It was established that the smaller the size of the burning particle the less oxide is deposited on the particle and the more oxide is carried away in the form of oxide smoke. For 100-μm particles, the fraction of deposited oxide was found to be ≈0.1 of the total mass of oxide formed.

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Ignition, combustion, and agglomeration of encapsulated aluminum particles in a composite solid propellant. II. Experimental studies of agglomeration

Cited by 63 publications

References 13 publications

Combustion of Aluminum‐Metal Fluoride Reactive Composites in Different Environments

Combustion of Aluminum‐Metal Fluoride Reactive Composites in Different Environments

Metal-CO2 Propulsion for Mars Missions: Current Status and Opportunities

The evolution of 100-µm aluminum agglomerates and initially continuous aluminum particles in the flame of a model solid propellant. II. Results

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