Oxidation mechanism of titanium nitride in oxygen

Desmaison, J.; Lefort, Pierre; Billy, M. de

doi:10.1007/bf00812775

Cited by 83 publications

(49 citation statements)

References 10 publications

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“…This confirms the different degree of oxidization of TiN indicated by the XRD analysis shown in figure 1. It is known that TiN can be converted into TiO 2 by a complete oxidation at medium temperatures in air, 28,29 and that the oxidation occurred from the surface to the inner of the film due to the diffusion of O 2 . 30 Due to the incomplete oxidization, TiN and TiO 2 grains/layers may coexist and form hetero-junctions, which may enhance the separation efficiency of electrons and holes, and thus improve the photocatalytic performance.…”

Section: Resultsmentioning

confidence: 99%

Tuning the optical bandgap of TiO2-TiN composite films as photocatalyst in the visible light

Xie¹,

Liu²,

Zhan³

et al. 2013

AIP Advances

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TiO2-TiN composite catalysts were prepared by oxidizing the TiN films in air at 350 °C. By adjusting the oxidation time to control the oxidation stage of TiN films, the optical band gap of the TiO2-TiN composites can be varied in a wide range from 1.68 eV to 3.23 eV. These composite films all showed red shift in photo-response towards the visible region, and depending on the optical band gap, some composite films exhibited good catalytic activity in the visible light region. This study provides a simple but effective method to prepare film photocatalyst working in visible light

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Section: Resultsmentioning

confidence: 99%

Tuning the optical bandgap of TiO2-TiN composite films as photocatalyst in the visible light

Xie¹,

Liu²,

Zhan³

et al. 2013

AIP Advances

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“…[1] The large difference in molar volumes of TiO 2 and TiN results in spallation of the oxide scale, resulting in a transition from parabolic to pseudo-linear kinetics. [2,3] TiAlN coatings provide much improved high-temperature oxidation resistance, up to 750°C to 900°C, and have consequently been used extensively for high-temperature cutting operations with minimum use of lubricant or dry machining. [4] Titanium aluminum nitride (Ti 1-x Al x N) has the B1 NaCl structure with 0 £ x £ 0.52, but as x is increased, phase decomposition occurs into B1 NaCl and wurtzite AlN structures.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior and Mechanisms of TiAlN/VN Coatings

Zhou

Rainforth

Rodenburg

et al. 2007

Metall Mater Trans A

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Hard wear-resistant coatings require excellent oxidation resistance for high-speed machining operations. Moreover, the oxide formed is integral to the frictional behavior and therefore the success of the coating. The oxidation behavior of TiAlN/VN nanoscale multilayer coatings was investigated using high-resolution techniques and was compared with TiN and TiAlN coatings. Static oxidation of TiAlN/VN films was studied in the range 550°C to 700°C, and characterized by high-temperature in-situ X-ray diffraction (XRD) and scanning transmission electron microscopy/energy-dispersive X-ray/electron energy loss spectroscopy (STEM/EDX/EELS) of selected surface cross sections. The oxidation resistance of TiAlN/VN was found to be controlled by the VN layers, and consequently, oxidation was initiated at a lower temperature than TiN and TiAlN coatings. The onset of oxidation of the TiAlN/VN coating was found to be ‡550°C with the VN being the first component to oxidize. At temperatures >600°C, a duplex oxide structure was formed; the inner layer comprised a porous region of Ti-rich and V-rich nanocrystallites, while several phases were observed in the outer region, including V 2 O 5 , TiO 2 , and AlVO 4 . V 2 O 5 was the dominant oxide at the outer layer at ‡638°C. The outward diffusion of V depended on the species present; in the inner layer, V was present as V 3+ , V 4+ , whereas a significant V 5+ was dominant in the outer layer of oxide at ‡638°C. An Au marker study suggested roughly equal diffusivity of cations outward, and oxygen inward diffusion occurred during oxidation.

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“…10 Here, the outer rutile scale grows by the outward diffusion of Ti, while the inner (SiO 2 , TiO 2 )-mixed scale grows by the inward diffusion of oxygen. On the other hand, the oxidation of TiN coatings or bulk is known to be controlled by the inward diffusion of oxygen through the TiO 2 layer, 3,4,13,14 which is enhanced by the grain boundaries of TiO 2 . However, in the present TiN-Ti 5 Si 3 composites, the outward diffusion of Ti +4 ions also occurred, due probably to the effect of impurities or different microstructures.…”

Section: Resultsmentioning

confidence: 99%

“…However, the disadvantage of this ceramic in high-temperature applications is that it oxidizes rapidly above 500°C. 3,4 Hence, in order to improve the oxidation resistance of TiN, Llauro et al 5 incorporated Ti 5 Si 3 into the TiN coatings by means of chemical-vapor deposition (CVD). They found that the Ti-N-Si codeposits were oxidized to TiO 2 , amorphous SiO 2 , or amorphous TiSiO during oxidation at 860-1170°C in air for up to 200 min.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation of TiN-Ti5Si3 Composites Prepared by Polymer Pyrolysis

Lee

Kim

2006

Oxid Met

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Composites consisting of a TiN matrix containing about 32 vol.% Ti 5 Si 3 were synthesized via polymer pyrolysis, and oxidized in the temperature range of 700 to 900°C for up to 120 h in air. Oxidation occurred mainly in the TiN matrix, because Ti 5 Si 3 was resistant to oxidation. The oxidation of the TiN matrix was preceded by the outward diffusion of Ti ions to form an outer TiO 2 layer, and the inward diffusion of oxygen ions to form an inner TiO 2 layer, together with nitrogen evolution from the TiN matrix.

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Oxidation mechanism of titanium nitride in oxygen

Cited by 83 publications

References 10 publications

Tuning the optical bandgap of TiO2-TiN composite films as photocatalyst in the visible light

Tuning the optical bandgap of TiO2-TiN composite films as photocatalyst in the visible light

Oxidation Behavior and Mechanisms of TiAlN/VN Coatings

High-Temperature Oxidation of TiN-Ti5Si3 Composites Prepared by Polymer Pyrolysis

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