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Zeng, Chenghui; Li, Moucheng; Liu, G.Q.; Wu, Weiping

doi:10.1023/a:1016020709500

Cited by 18 publications

(7 citation statements)

References 12 publications

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“…The intermediate ternary compound between Ni, NiO and TiO 2 (anatase) is NiTiO 3 (nickel titanate) which forms in the presence of NiO and TiO 2 at around 600 °C [25][26]. NiTiO 3 is the only stable compound between Ni, NiO and TiO 2 that also can co-exist and form joined structures with TiO 2 particles [16,27]. Both of these reactions can take place on the surface of the A1 and B1 coatings during the oxidation of nickel matrix and dispersed TiO 2 particles with oxygen from air.…”

Section: Analysis Of Xrd Resultsmentioning

confidence: 99%

“…3) have shown that Ni-Ti-O compounds (Ni 3 TiO 5 and NiTiO 3 ) were thermodynamically formed and were present on the surface of oxidized coatings. Zeng et al had shown that the formation of NiTiO 3 contributes to the lower oxidation rates for the alloys at temperatures lower than 750 °C [16]. The formation of Ni-Ti-O compounds in the oxide layer can have an impact on the oxidation rate of cermet coatings in two ways; firstly, some of the oxygen ions that are diffusing inward into the bulk of coating can react with nickel and be stored in the compound structures (Ni 3 TiO 5 and NiTiO 3 ) resulting in a lower diffusion rate of oxygen and secondly, this reduction in the number of diffusing oxygen ions can cause a reduction in the rate of outward diffusion of nickel towards the forming oxide film.…”

Section: Oxidation Mass Change Of Coatings -Study Of Current Density mentioning

confidence: 99%

“…Nickel-based cermet coatings composed of Al 2 O 3 have much greater hardness compared to pure nickel coatings and therefore they are used as a protective layer against wear and erosion [12][13][14][15]. Additionally, cermet coatings composed of nanosized TiO 2 incorporated in a nickel matrix have shown improved thermal stability against high temperature oxidation [16]. Until now, there has been no study on the oxidation performance of nickel-based cermet coatings when both Al 2 O 3 and TiO 2 particles are incorporated in the matrix.…”

Section: Introductionmentioning

confidence: 99%

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High Temperature Oxidation of Nickel-based Cermet Coatings Composed of Al2O3 and TiO2 Nanosized Particles

Farrokhzad

Khan

2014

High Temperature Materials and Processes

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New technological challenges in oil production require materials that can resist high temperature oxidation. In-Situ Combustion (ISC) oil production technique is a new method that uses injection of air and ignition techniques to reduce the viscosity of bitumen in a reservoir and as a result crude bitumen can be produced and extracted from the reservoir. During the in-situ combustion process, production pipes and other mechanical components can be exposed to air-like gaseous environments at extreme temperatures as high as 700 °C. To protect or reduce the surface degradation of pipes and mechanical components used in in-situ combustion, the use of nickel-based ceramic-metallic (cermet) coating produced by co-electrodeposition of nanosized Al 2 O 3 and TiO 2 have been suggested and earlier research on these coatings have shown promising oxidation resistance against atmospheric oxygen and combustion gases at elevated temperatures. Co-electrodeposition of nickel-based cermet coatings is a low-cost method that has the benefit of allowing both internal and external surfaces of pipes and components to be coated during a single electroplating process. Research has shown that the volume fraction of dispersed nanosized Al 2 O 3 and TiO 2 particles in the nickel matrix which affects the oxidation resistance of the coating can be controlled by the concentration of these particles in the electrolyte solution, as well as the applied current density during electrodeposition. This paper investigates the high temperature oxidation behaviour of novel nanostructured cermet coatings composed of two types of dispersed nanosized ceramic particles (Al 2 O 3 and TiO 2 ) in a nickel matrix and produced by coelectrodeposition technique as a function of the concentration of these particles in the electrolyte solution and applied current density. For this purpose, high temperature oxidation tests were conducted in dry air for 96 hours at 700 °C to obtain mass changes (per unit of area) at specific time intervals. Statistical techniques as described in ASTM G16 were used to formulate the oxidation mass change as a function of time. The cross-section and surface of the oxidized coatings were examined for both visual and chemical analyses using wavelength dispersive x-ray spectroscopy (WDS) element mapping, X-ray Diffraction (XRD) and Energy-dispersive X-ray spectroscopy (EDS). The results showed that the volume fraction for each type of particle in the nickel matrix corresponded to its partial molar concentration in the electrolyte solutions. Increase in volume fraction of particles in the nickel matrix was correlated to lower oxidation rates. It was concluded that formation of Ni 3 TiO 5 and NiTiO 3 compounds can reduce the oxidation rate of cermet coatings by capturing some inward diffusing oxygen ions resulting in a lower number of nickel cations diffusing upward into the oxide layer.

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Section: Analysis Of Xrd Resultsmentioning

confidence: 99%

Section: Oxidation Mass Change Of Coatings -Study Of Current Density mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Temperature Oxidation of Nickel-based Cermet Coatings Composed of Al2O3 and TiO2 Nanosized Particles

Farrokhzad

Khan

2014

High Temperature Materials and Processes

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“…The specific Ni k p values reported in the latter studies are presented in Table 3, along with any conversions needed for common plots. Another relevant study is that of Zeng et al [25] which reports k p measured for 100 h oxidation of pure Ni, Ni-5,10,15Ti, and pure Ti at 650, 750, and 850°C, and is notably for 100 h duration. The results are listed in Table 3 and shown in Fig 7, along with the Ni and Ti data from just Kofstad for the sake of clarity.…”

Section: Comparative Arrhenius Behaviormentioning

confidence: 99%

Comparative Oxidation Kinetics of a NiPtTi High Temperature Shape Memory Alloy

Smialek

Humphrey²,

Noebe

2010

Oxid Met

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A high temperature shape memory alloy, Ni-30Pt-50Ti (at.%), with an M s near 600°C, was isothermally oxidized in air for 100 h over the temperature range of 500-900°C. Nearly parabolic kinetics were observed in log-log and parabolic plots, with no indication of initial fast transient oxidation. On average the rates were about a factor of 4 lower than values measured here for a binary Ni-49Ti commercial SMA. The overall behavior could be best described by the Arrhenius relationships:NiPtTi: k p ¼ 1:54 Â 10 12 exp ðÀ250 kJ=molÞRT ½ mg 2 =cm 4 h NiTi: k p ¼ 6:39 Â 10 12 exp ðÀ249 kJ=molÞRT ½ mg 2 =cm 4 h The activation energy was consistent with literature values for TiO 2 scale growth measured for elemental Ti and some NiTi alloys, at *210-260 kJ/mol. However, a number of other studies produced activation energies in the range of 135-150 kJ/ mol. This divergence may be related to various complex scale layers and depletion zones, however, no specific correlation can be identified at present.

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“…However, the oxidation of Ni-Ti alloys at 650uC in air can produce an almost pure TiO 2 scale. 8 Taking into account that the cathode of molten carbonate fuel cells is generally formed by in situ oxidation and subsequent lithiation of a presintered porous nickel plaque, it was considered to be of interest to study the corrosion behaviour of pre-oxidised Ni-Ti alloys in eutectic (Li, K) 2 CO 3 at 650uC. The present paper examined the effect of pre-oxidation on the corrosion behaviour of Ni-Ti alloys in eutectic (Li,K) 2 CO 3 at 650uC in air.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-oxidation treatment on the corrosion behaviour of Ni–Ti alloys in eutectic (Li, K)₂CO₃mixture at 650°C

Zeng¹,

Zhou²,

Wu³

2004

Corrosion Engineering, Science and Technology

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The effect of pre-oxidation treatment at 650uC in air on the corrosion behaviour of binary Ni-Ti alloys containing 5, 10, and 15 wt-%Ti in eutectic (Li, K) 2 CO 3 at 650uC in air has been investigated. The results indicate that the pre-oxidation of the alloys can produce an almost pure TiO 2 scale. Nevertheless, this TiO 2 scale cannot hinder the formation of NiO outside and beneath the TiO 2 scale during subsequent molten salt corrosion. The corrosion rates of the alloys decrease with increasing content of titanium in the alloys. The corrosion of the alloys proceeds mainly by inward diffusion of oxygen through the TiO 2 layer, forming large quantities of NiO beneath the TiO 2 layer. Compared with Ni-5Ti and Ni-10Ti, the formation of NiO on Ni-15Ti is inhibited significantly, especially in the initial stages.CEST/2033

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Cited by 18 publications

References 12 publications

High Temperature Oxidation of Nickel-based Cermet Coatings Composed of Al2O3 and TiO2 Nanosized Particles

High Temperature Oxidation of Nickel-based Cermet Coatings Composed of Al2O3 and TiO2 Nanosized Particles

Comparative Oxidation Kinetics of a NiPtTi High Temperature Shape Memory Alloy

Effect of pre-oxidation treatment on the corrosion behaviour of Ni–Ti alloys in eutectic (Li, K)₂CO₃mixture at 650°C

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Untitled

Cited by 18 publications

References 12 publications

High Temperature Oxidation of Nickel-based Cermet Coatings Composed of Al2O3 and TiO2 Nanosized Particles

High Temperature Oxidation of Nickel-based Cermet Coatings Composed of Al2O3 and TiO2 Nanosized Particles

Comparative Oxidation Kinetics of a NiPtTi High Temperature Shape Memory Alloy

Effect of pre-oxidation treatment on the corrosion behaviour of Ni–Ti alloys in eutectic (Li, K)2CO3mixture at 650°C

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Effect of pre-oxidation treatment on the corrosion behaviour of Ni–Ti alloys in eutectic (Li, K)₂CO₃mixture at 650°C