Aluminum combustion in wet and dry CO2: Consequences for surface reactions

Sarou‐Kanian, Vincent; Rifflet, Jean-Claude; Millot, F.; Gökalp, İskender

doi:10.1016/j.combustflame.2005.10.014

Cited by 36 publications

(24 citation statements)

References 22 publications

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“…In all cases, the C-rich phase is largely present near the particle surface and essentially encapsulates the reaction products. This finding is in agreement with previous studies [22] involving the combustion of large (∼3 mm) Al particles in CO 2 atmosphere, which showed that shortly after ignition, carbon forms on the surface, encapsulates the particle, and inhibits burning. Interestingly, carbon and Al 2 O 3 form in the 6 and 29 wt% Ni cases, even though the particles do not combust vigorously.…”

Section: Ignition In Co 2 Atmospheresupporting

confidence: 94%

“…This result is in agreement with the video recordings, which show two-phase liquid droplets (liquid Al 2 O 3 is immiscible in liquid Al). It is also consistent with other studies on Al combustion in CO 2 [22,23], which reported that alumina condenses from the flame zone and forms large lobes on the surface of burning Al droplets.…”

Section: Ignition In Co 2 Atmospheresupporting

confidence: 92%

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Ignition mechanism of nickel-coated aluminum particles

Andrzejak¹,

Shafirovich²,

Varma³

2007

Combustion and Flame

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Section: Ignition In Co 2 Atmospheresupporting

confidence: 94%

Section: Ignition In Co 2 Atmospheresupporting

confidence: 92%

Ignition mechanism of nickel-coated aluminum particles

Andrzejak¹,

Shafirovich²,

Varma³

2007

Combustion and Flame

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“…Certainly, HF is a less effective oxidizer for Al than starting metal fluorides, so that the ignition of composite particles in such cases is delayed. Another effect occurring in the environment containing CO and CO 2 is formation of condensed phase carbides and oxy‐carbides . This is expected to occur with both composite powders prepared as well as with pure Al burning in such environments.…”

Section: Discussionmentioning

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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“…Because the droplet size decreases, the carbon concentration inevitably reaches the saturation limit, upon which either a carbon or aluminum oxycarbide layer covers the surface, hindering Al vaporization [66]. It should be noted that the second burning regime reported in [66], leading to the disappearance of carbon through the gasification reaction C CO 2 ! 2CO, was observed under continued laser heating of 3 mm Al droplets and may not occur during self-sustained combustion of smaller Al particles.…”

Section: Resultsmentioning

confidence: 98%