“…Overall, the peak number concentration was found in the range of 0.8 × 10 6 –7.8 × 10 6 cm −3 for the entire set of experiments. The plausible mechanism of particle generation during graphite oxidation have been discussed elsewhere, qualitatively 53 . Figure 3 Particle generation in bare and coated graphite at different temperature.…”
Section: Resultsmentioning
confidence: 99%
“…In our earlier work 53 , we discussed the effect of oxidation temperature on surface morphology of bare graphite specimens. In that case, the frequency of cavities and flakes increased when the temperature increased from 500 to 600 °C.…”
Section: Resultsmentioning
confidence: 99%
“…The mechanism of oxidation behavior of graphite at high temperature is well documented 32 , 54 , 55 . Mechanism for the generation of particles from graphite surface at high temperature was discussed in our previous work performed with bare graphite specimens 53 . Generation of particles signifies the incomplete combustion of the specimen.…”
Section: Effect Of Coating On the Generation Of Particlesmentioning
Owing to its exceptional properties at high temperature, graphite is used in several applications such as structural material and fuel block in high temperature nuclear reactors. Air ingress is one of the serious safety concerns in these reactors. Oxidation of graphite leading to increased porosity affects its mechanical strength and may lead to core collapse resulting in a severe accident. During such a scenario, generation of graphite particles could be the main hazard. Once generated, these particles often in fine and ultrafine sizes, may carry radioactivity to large distances and/or for long times. These particles owing to their higher surface to volume ratio possess an additional inhalation hazard. Ultrafine particles have the potential to enter into respiratory tract and cause damage to body organs. Coating of graphite components is preferred to reduce the oxidation induced damages at high temperatures. In the present work, effect of alumina (Al
2
O
3
) coating on the emission characteristics of particles from graphite under high temperature conditions has been investigated. Bare and Al
2
O
3
coated graphite specimens were heated within a closed chamber at varying temperatures during these experiments. Temporal evolution of concentrations of gases (CO and CO
2
) and particles were measured. The results reveal that Al
2
O
3
coating on the graphite delayed the oxidation behavior and the structure of graphite remained largely intact at high temperatures. A significant reduction in aerosol formation and CO emission was also noticed for the coated specimens.
“…Overall, the peak number concentration was found in the range of 0.8 × 10 6 –7.8 × 10 6 cm −3 for the entire set of experiments. The plausible mechanism of particle generation during graphite oxidation have been discussed elsewhere, qualitatively 53 . Figure 3 Particle generation in bare and coated graphite at different temperature.…”
Section: Resultsmentioning
confidence: 99%
“…In our earlier work 53 , we discussed the effect of oxidation temperature on surface morphology of bare graphite specimens. In that case, the frequency of cavities and flakes increased when the temperature increased from 500 to 600 °C.…”
Section: Resultsmentioning
confidence: 99%
“…The mechanism of oxidation behavior of graphite at high temperature is well documented 32 , 54 , 55 . Mechanism for the generation of particles from graphite surface at high temperature was discussed in our previous work performed with bare graphite specimens 53 . Generation of particles signifies the incomplete combustion of the specimen.…”
Section: Effect Of Coating On the Generation Of Particlesmentioning
Owing to its exceptional properties at high temperature, graphite is used in several applications such as structural material and fuel block in high temperature nuclear reactors. Air ingress is one of the serious safety concerns in these reactors. Oxidation of graphite leading to increased porosity affects its mechanical strength and may lead to core collapse resulting in a severe accident. During such a scenario, generation of graphite particles could be the main hazard. Once generated, these particles often in fine and ultrafine sizes, may carry radioactivity to large distances and/or for long times. These particles owing to their higher surface to volume ratio possess an additional inhalation hazard. Ultrafine particles have the potential to enter into respiratory tract and cause damage to body organs. Coating of graphite components is preferred to reduce the oxidation induced damages at high temperatures. In the present work, effect of alumina (Al
2
O
3
) coating on the emission characteristics of particles from graphite under high temperature conditions has been investigated. Bare and Al
2
O
3
coated graphite specimens were heated within a closed chamber at varying temperatures during these experiments. Temporal evolution of concentrations of gases (CO and CO
2
) and particles were measured. The results reveal that Al
2
O
3
coating on the graphite delayed the oxidation behavior and the structure of graphite remained largely intact at high temperatures. A significant reduction in aerosol formation and CO emission was also noticed for the coated specimens.
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