Kinetics and modeling of diffusion phenomena occurring during the complete oxidation of zinc powder: influence of granulometry, temperature and relative humidity of the oxidizing fluid

Delalu, H.; Vignalou, J.R.; El-Khatib, Mostafa; Metz, Renaud

doi:10.1016/s1293-2558(00)00130-8

Cited by 15 publications

(17 citation statements)

References 4 publications

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“…The oxidation rate decreases with time. It is parabolic in the temperature range studied, indicating that the process is limited by diffusion through the oxide film [8,9]. Oxygen atoms (or zinc atoms) diffuse through the dense oxide layer; the thickness of the layer increases with time.…”

Section: Resultsmentioning

confidence: 94%

“…It is worth noting that the model is unable to distinguish the chemical species which actually diffuses: zinc or oxygen. The kinetics model of the parabolic diffusion can be expressed by the equation [8,9]:…”

Section: Resultsmentioning

confidence: 99%

“…By contrast, our objective concerns the total oxidation of the particles, as fast as possible. The majority of the theories advanced apply to the surface oxidation of metal but very few models have been developed for the complete oxidation of metal powders [8].…”

Section: Introductionmentioning

confidence: 99%

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Complete Oxidation of Zinc Powder. Validation of Kinetics Models

Garcı́a¹,

Sánchez²,

Metz³

2008

Oxid Met

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The kinetics of complete oxidation of different samples of zinc powder by air has been investigated by thermogravimetric measurements under isothermal conditions in the range 973-1,173 K. Particles size was in the 63-80 lm range. We succeeded in carrying out the full oxidation of the powders far above the zinc-metal melting point (692.6 K). This phenomenon is linked to the presence of a thin ZnO layer which confines the liquid metal during the oxidation process. Two kinetics models have been verified. The apparent activation energies obtained from the Arrhenius law were 128 kJ mol -1 and 129 kJ mol -1 , respectively.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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Complete Oxidation of Zinc Powder. Validation of Kinetics Models

Garcı́a¹,

Sánchez²,

Metz³

2008

Oxid Met

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“…The conditions for aerosol generation were favorable for oxidation as sparks between the wires led to high temperature, and the compressed air supplied oxygen to the system. However, the zinc particles were probably not fully oxidized during this process as oxidation first occurs for surface atoms and would require more time (compared to particle generation duration) to reach the core of the particles (Delalu et al, 2000). Although zinc oxidation kinetics has been studied for bulk material and coarse particles, data are lacking for nanoparticles.…”

Section: Dlpi Gravimetric and Chemical Analysesmentioning

confidence: 99%

Quantification of Low Pressure Impactor Wall Deposits during Zinc Nanoparticle Sampling

Durand

Bau

Moréle

et al. 2014

Aerosol Air Qual. Res.

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A Dekati® low pressure impactor (DLPI) is used to determine the mass distribution of airborne particles from 7 nm to 10 µm as a function of aerodynamic diameter. Quantification of wall deposits inside this sampling device was performed for the first time using polydisperse zinc aerosol produced by a thermal spraying process. This aerosol is more representative of the size distribution found in occupational atmospheres than aerosols usually produced in laboratories. Each experiment (3 replicates) was carried out for two durations. The results showed that wall deposits were quite considerable and in relation with aerosol modes. 13% and 14% of the total mass was found on the wall after sampling periods of 5 and 20 minutes, respectively. Relative losses could reach 50% for certain impaction stages and these losses were also quite different between replicates.

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“…The oxidation process of Zn particles under various environments has also been studied by a few authors. For instance, Aida et al [10] and Delalu et al [12] showed that the isothermal oxidation of Zn obeyed the parabolic growth law for micrometer-sized particles.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of thermal oxidation of nanoscale alloys of aluminium and zinc (nAlZn)

Noor

Wen

2015

Journal of Physics and Chemistry of Solids

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Aluminium-based alloys have wide applications but little is known about the thermalchemical kinetics of nanoalloys. This work investigated the thermal oxidation of Zn and Al nanoalloys (nAlZn) with a BET equivalent diameter of 141 nm through the simultaneous TGA/DSC method. The thermal analysis was combined with elemental, morphology and crystalline structure analysis to elucidate the reaction mechanisms. It was found that the complete oxidation of nAlZn in air can be characterised by a three-stage process, including two endothermic and three exothermic reactions. With the help of ex-situ XRD, different reaction pathways were proposed for different stages, forming the end products of ZnO and ZnAl 2 O 4 . The reactivity comparison between Al and nAlZn suggested that different criteria should be used for different applications.

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Kinetics and modeling of diffusion phenomena occurring during the complete oxidation of zinc powder: influence of granulometry, temperature and relative humidity of the oxidizing fluid

Cited by 15 publications

References 4 publications

Complete Oxidation of Zinc Powder. Validation of Kinetics Models

Complete Oxidation of Zinc Powder. Validation of Kinetics Models

Quantification of Low Pressure Impactor Wall Deposits during Zinc Nanoparticle Sampling

Experimental study of thermal oxidation of nanoscale alloys of aluminium and zinc (nAlZn)

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