Kinetic Parameters For The High-Temperature Oxidation Of In-Situ Combustion Coke

1985 ◽  
Vol 24 (06) ◽  
Author(s):  
F.B. Thomas ◽  
R.G. Moore ◽  
D.W. Bennion
Keyword(s):  
High Temperature ◽  
Kinetic Parameters ◽  
High Temperature Oxidation ◽  
In Situ Combustion ◽  
Temperature Oxidation

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

2014 ◽  
Vol 33 (5) ◽  
pp. 407-419 ◽  
Author(s):  
M. A. Farrokhzad ◽  
T. I. Khan
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Volume Fraction ◽  
Nickel Matrix ◽  
Applied Current ◽  
In Situ Combustion ◽  
Temperature Oxidation ◽  
Cermet Coatings ◽  
X Ray

AbstractNew 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 Al2O3 and TiO2 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 Al2O3 and TiO2 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 (Al2O3 and TiO2) 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 Ni3TiO5 and NiTiO3 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.

scholarly journals High-temperature oxidation resistance of VCps-reinforced Fe-matrix composites using an in-situ reaction

AIP Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 015319
Author(s):  
Pinghu Chen ◽  
Ruiqing Li ◽  
Ripeng Jiang ◽  
Songsheng Zeng ◽  
Yun Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Matrix Composites ◽  
Temperature Oxidation ◽  
In Situ Reaction

In Situ Measurement of the Phase Transformation Behavior of Al2O3 Scale during High-Temperature Oxidation using Synchrotron Radiation

2011 ◽  
Vol 696 ◽  
pp. 63-69 ◽  
Author(s):  
Shigenari Hayashi ◽  
Isao Saeki ◽  
Yoshitaka Nishiyama ◽  
Takashi Doi ◽  
Shoji Kyo ◽  
...  
Keyword(s):  
High Temperature ◽  
Synchrotron Radiation ◽  
High Temperature Oxidation ◽  
Structural Changes ◽  
Lattice Parameter ◽  
Transformation Behavior ◽  
Initial Oxidation ◽  
Temperature Oxidation ◽  
Diffraction Peaks

Very thin Fe-coatings, ~50nm, were found to suppress metastable Al2O3 formation on Fe-50Al and Ni-50Al alloys in our previous study. The authors proposed a mechanism whereby α-Al2O3 precipitates from the Al-saturated Fe2O3, which was formed during initial oxidation, since α-Al2O3 and α-Fe2O3 have isomorphous structures. In order to confirm the proposed mechanism, in-situ measurements were made of structural changes in the oxide scales formed on FeAl with and without Fe coating during heating and subsequent isothermal high temperature oxidation by synchrotron radiation with a two-dimensional X-ray detector. Diffraction peaks from Fe2O3 were initially observed at around 350°C on Fe-coated samples. The lattice parameter of the Fe2O3 initially increased linearly due to thermal expansion, but then rapidly decreased due to the formation of a solid solution of Fe2O3-Al2O3. α-Al2O3 started to appear at around 800°C, but no peaks from metastable Al2O3 were observed. The diffraction peaks from the α-Al2O3 on Fe-coated samples consisted of two distinct peaks, indicating that the α-Al2O3 had two different lattice parameters. These results suggest that the α-Al2O3 was formed not only by precipitation from the Al-saturated Fe2O3, but also by oxidation of Al in the substrate.

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