Non-isothermal and isothermal kinetics of high temperature oxidation of micrometer-sized titanium particles in air

Schulz, Olga; Eisenreich, N.; Kelzenberg, Stefan; Schuppler, Heike; Neutz, Jochen; Kondratenko, Evgenii V.

doi:10.1016/j.tca.2011.01.038

Cited by 15 publications

(5 citation statements)

References 29 publications

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“…The D 4 model (Jander’s three-dimensional diffusion) has been adopted in many systems, such as thermal decomposition of calix[8]arene, decomposition of strontium nitrate, reoxidation of Ti–Magnéli phases, and oxidation of titanium particles …”

Section: Resultsmentioning

confidence: 99%

“…The D 4 model (Jander's three-dimensional diffusion) has been adopted in many systems, such as thermal decomposition of calix [8]arene, 22 decomposition of strontium nitrate, 25 reoxidation of Ti−Magneĺi phases, 41 and oxidation of titanium particles. 42 E a in these cases spans from 68.5 to 343.9 kJ/mol. It is clear that E a in our case is in the range of literature data.…”

Section: Most Probable Kinetic Model and Preexponentialmentioning

confidence: 94%

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Kinetics of Thermal Regeneration of SO₂-Captured V₂O₅/AC

Zhang

Liu

et al. 2015

Ind. Eng. Chem. Res.

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Carbon-based materials have been used for SO 2 removal from flue gases for several decades. In this process, SO 2 is captured by storing in the pores of carbons in the form of H 2 SO 4 , and regeneration of the SO 2 -captured materials is necessary to recover SO 2 capture ability. V 2 O 5 -supported activated coke (V 2 O 5 /AC) has been reported to be highly active for SO 2 removal, and its regeneration has been investigated from the viewpoint of the reaction mechanism. This work studied the regeneration kinetics with the aid of a thermogravimetric analyzer coupled with a mass spectrometer. The SO 2 -captured sample was prepared in a fixed-bed reactor with a simulated flue gas containing 1500 ppm of SO 2 , 5% O 2 , and 5% H 2 O. The kinetic equation was obtained by fitting the H 2 SO 4 conversion (α) at different heating rates with nonisothermal kinetic methods called Flynn−Wall− Ozawa and Coats−Redfern. The results indicated that the regeneration kinetic behavior varies with α. At α = 0.1−0.4, regeneration follows first-order reaction model f(α) = 1 − α with an activation energy of about 85.7 kJ/mol. At α = 0.5−0.8, regeneration follows three-dimensional diffusion model f(α) = 1.5(1 − α) 2/3 [1 − (1 − α) 1/3 ] −1 , with the activation energy increasing from 88.9 kJ/mol at α = 0.5 to 112.1 kJ/mol at α = 0.8.

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Section: Resultsmentioning

confidence: 99%

Section: Most Probable Kinetic Model and Preexponentialmentioning

confidence: 94%

Kinetics of Thermal Regeneration of SO₂-Captured V₂O₅/AC

Zhang

Liu

et al. 2015

Ind. Eng. Chem. Res.

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“…TGA/DSC simultaneous thermal analysis is a common method to study the non-isothermal oxidation behaviors of metals and their alloys [20,21,22,23]. Adopting the TGA/DSC method, G.B.…”

Section: Introductionmentioning

confidence: 99%

Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds

Ouyang

et al. 2019

Materials

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Non-isothermal oxidation is one of the important issues for the safe application of Ti-Al alloys, so this study aimed to illustrate the non-isothermal oxidation behaviors and the corresponding mechanisms of a TiAl-based alloy in comparison with a Ti3Al-based alloy. The non-isothermal oxidation behaviors of Ti-46Al-2Cr-5Nb and Ti-24Al-15Nb-1.5Mo alloys in pure oxygen were comparatively investigated with a thermogravimetry-differential scanning calorimetry (TGA/DSC) simultaneous thermal analyzer heating from room temperature to 1450 °C with a heating rate of 40 °C/min. When the temperature rose above 1280 °C, the oxidation rate of the Ti-46Al-2Cr-5Nb alloy sharply increased and exceeded that of the Ti-24Al-15Nb-1.5Mo alloy owing to the occurrence of internal oxidation. When the temperature was higher than 1350 °C, the oxidation rate of the Ti-46Al-2Cr-5Nb alloy decreased obviously due to the generation of an oxygen-barrier β-Al2TiO5-rich layer by a chemical reaction between Al2O3 and TiO2 in the oxide scale. Based on Wagner’s theory of internal oxidation, the reason for the occurrence of internal oxidation in the Ti-46Al-2Cr-5Nb alloy is the formation of the α phase in the subsurface, while no internal oxidation occurred in the Ti-24Al-15Nb-1.5Mo alloy due to the existence of the β phase in the subsurface with the enrichment of Nb and Mo.

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“…The non-isothermal oxidation behavior of titanium alloy powders in micron- and nano-scales has been studied for the application in the fields of explosives and propellants [13,14], while the non-isothermal oxidation behavior of bulk titanium alloys is seldom studied. G.B.…”

Section: Introductionmentioning

confidence: 99%

Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy

Ouyang

et al. 2018

Materials

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Non-isothermal oxidation is one of the important issues related to the safe application of high-temperature titanium alloys, so this study focuses on the non-isothermal oxidation behavior and mechanism of near-α titanium alloys. The thermogravimetry-differential scanning calorimetry (TGA/DSC) method was used to study the non-isothermal oxidation behavior of TA29 titanium alloy heated from room temperature to 1450 °C at a heating rate of 40 °C/min under pure oxygen atmosphere. The results show that non-isothermal oxidation behavior can be divided into five stages, including no oxidation, slow oxidation, accelerated oxidation, severe oxidation and deceleration oxidation; for the three-layer TiO2 scale, Zr, Nb, Ta are enriched in the intermediate layer, while Al is rich in the inner layer and Sn is segregated at the oxide-substrate interface, which is related to their diffusion rates in the subsurface α case. The oxidation mechanism for each stage is: oxygen barrier effect of a thin compact oxide film; oxygen dissolution; lattice transformation accelerating the dissolution and diffusion of oxygen; oxide formation; oxygen barrier effect of recrystallization and sintering microstructure in outer oxide scale. The alloying elements with high valence state and high diffusion rate in α-Ti are favorable to slow down the oxidation rate at the stage governed by oxide formation.

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Non-isothermal and isothermal kinetics of high temperature oxidation of micrometer-sized titanium particles in air

Cited by 15 publications

References 29 publications

Kinetics of Thermal Regeneration of SO₂-Captured V₂O₅/AC

Kinetics of Thermal Regeneration of SO₂-Captured V₂O₅/AC

Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds

Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy

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Non-isothermal and isothermal kinetics of high temperature oxidation of micrometer-sized titanium particles in air

Cited by 15 publications

References 29 publications

Kinetics of Thermal Regeneration of SO2-Captured V2O5/AC

Kinetics of Thermal Regeneration of SO2-Captured V2O5/AC

Non-Isothermal Oxidation Behaviors and Mechanisms of Ti-Al Intermetallic Compounds

Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy

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Kinetics of Thermal Regeneration of SO₂-Captured V₂O₅/AC

Kinetics of Thermal Regeneration of SO₂-Captured V₂O₅/AC