High Temperature Oxidation of Liquid Cu-Ti Alloy at 1473K

2009 ◽  
Vol 283-286 ◽  
pp. 194-199
Author(s):  
Yasushi Sazaki ◽  
Hiroki Tomita ◽  
Mitsutaka Hino
Keyword(s):  
Oxidation Rate ◽  
Inductively Coupled Plasma ◽  
Ti Alloy ◽  
Titanium Oxides ◽  
Temperature Oxidation ◽  
Kinetics Of Oxidation ◽  
Inductively Coupled ◽  
Cu Alloy ◽  
Kinetics Of ◽  
Oxidation Theory

The kinetics of oxidation of liquid Cu-0.5mass%Ti alloy at 1473K in CO2-CO gas mixture has been investigated by varying the oxygen potential. The pO2 is set to be enough to oxidize Ti in liquid Cu-Ti alloy but not for the oxidation of liquid Cu. Alloy samples were taken with a quartz tube during the experiments and Ti and O contents in the samples were analyzed by inductively coupled plasma method, and infrared absorption method. The phases of the formed titanium oxide layers were consisted of several different titanium oxides and were identified by using EBSD. The oxidation rate was evaluated based on the change of the Ti content in the Cu-Ti melts. The apparent overall oxidation rate is reasonably represented by the parabolic rate law. This oxidation behaviour was well explained based on the multi-layered oxidation theory.

Improvement of Hydrogenation and Dehydrogenation Kinetics on MgH2 by the Catalytic Effect of ZrO2

2011 ◽  
Vol 117-119 ◽  
pp. 1195-1198
Author(s):  
Liang Zeng ◽  
Toru Kimura ◽  
Satoshi Hino ◽  
Hiroki Miyaoka ◽  
Takayuki Ichikawa ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Room Temperature ◽  
Catalytic Effect ◽  
Atomic Emission ◽  
Hydrogen Desorption ◽  
Milling Process ◽  
Spectroscopy Analysis ◽  
Inductively Coupled ◽  
Dehydrogenation Kinetics ◽  
Kinetics Of

Hydrogen desorption temperature of MgH2, which was milled with 20 pieces of ZrO2 balls for 20 h, was decreased to 240 °C, although steel−ball−milled MgH2 required more than 350 °C. Moreover, the completely dehydrogenated product was able to absorb hydrogen of ~3.5 mass% even at room temperature under 1 MPa hydrogen within 5 hours. Inductively coupled plasma−atomic emission spectroscopy analysis revealed zirconium element was doped into MgH2 from the ZrO2 balls during the milling process. Therefore, it was concluded that the presence of ZrO2 improved the kinetics of the hydrogenation and dehydrogenation behaviors of MgH2.

Fluoride Interference in the Determination of Boron by Inductively Coupled Plasma Emission Spectroscopy

1993 ◽  
Vol 47 (2) ◽  
pp. 150-155 ◽  
Author(s):  
János Fucskó ◽  
Samantha H. Tan ◽  
Hamy La ◽  
Marjorie K. Balazs
Keyword(s):  
Complex Formation ◽  
Inductively Coupled Plasma ◽  
Inductively Coupled ◽  
Signal Change ◽  
Icp Ms ◽  
Efficient Diffusion ◽  
Plasma Emission Spectroscopy ◽  
Borophosphosilicate Glass ◽  
Kinetics Of

Boron determination in borophosphosilicate glass films by the ICP-AES or ICP-MS technique can be performed after dissolution of the sample in HF solution. However, addition of HF to boric acid standard solution can cause a drift in the slope of the calibration curve. The signal change was correlated with the kinetics of the borontetrafluoride complex formation reaction. The mechanism was explained by the selectively increased boron transport into the plasma, which was caused by the more efficient diffusion of borontrifluoride gas through the aerosol particles into the nebulizer gas. With the kinetics of borontetrafluoride complex formation taken into consideration, an accurate and precise method was developed for the determination of boron in BPSG films.

On the Low-Temperature Oxidation of Processed Peat

1997 ◽  
Vol 15 (2) ◽  
pp. 162-171 ◽  
Author(s):  
J.C. Jones
Keyword(s):  
Low Temperature ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Kinetics Of Oxidation ◽  
The Difference ◽  
Kinetics Of

Small amounts of processed peat have been examined in a microcalorimeter. Kinetics of oxidation are different from those previously re ported for the same material using much larger samples. The difference is at least in part due to loss of volatiles during the initial conditioning of a sample in the microcalorimeter.

Kinetics and mechanism of oxidation of lactic acid by KMnO4 in H2SO4 medium

1985 ◽  
Vol 63 (12) ◽  
pp. 3317-3321 ◽  
Author(s):  
M. M. Girgis ◽  
S. A. El-Shatoury ◽  
Z. H. Khalil
Keyword(s):  
Lactic Acid ◽  
Oxidation Rate ◽  
Arrhenius Equation ◽  
Activation Parameters ◽  
Initial Oxidation ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Acid Catalyzed ◽  
Mechanism Of Oxidation ◽  
Kinetics Of

The initial oxidation stages of lactic acid by acid permanganate were investigated. The rate of the induction period was slow and then gradually increased. The kinetics of oxidation were second order, first order with respect to both lactic acid and Mn(VII). The reaction was acid catalyzed. Addition of Mn(II) ions largely increased the rate of the initial stages and decreased the rate of the following stages. The oxidation rate was decreased by the addition of F− or [Formula: see text] ions. The Arrhenius equation was valid for the reaction between 16.5 and 34 °C. Activation parameters were evaluated and a mechanism consistent with the results obtained was proposed.

scholarly journals Using real-time UV–visible spectrophotometer to assess an Al–Zn–Mg–Cu alloy's dissolution in acidic solution

2020 ◽  
Vol 7 (11) ◽  
pp. 200461
Author(s):  
Qingqing Sun ◽  
Yang Yang ◽  
Shuai Wang ◽  
Panyi Liang ◽  
Bin Lin ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Electrochemical Impedance ◽  
Galvanic Corrosion ◽  
Impedance Spectrum ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Electrochemical Impedance Spectrum ◽  
Plasma Atomic Emission Spectrometry ◽  
Inductively Coupled ◽  
Cu Alloy

Applicability and limitations of using online non-destructive ultraviolet–visible (UV–vis) spectrophotometer to monitor the dissolution of an Al–Zn–Mg–Cu alloy in HCl-containing solution were studied. Inductively coupled plasma atomic emission spectrometry results indicate that the spectrum absorbance at 252 nm is mainly attributed to Cu-containing complexes. Surprisingly, an hours-long ‘induction' period was observed from UV–vis results. This is not a real indicator of induction for Al dissolution as revealed by electrochemical impedance spectrum, actually it reflects the alloy's galvanic corrosion nature that Cu species are released after Al, Zn and Mg species.

Synthetic Jet Fuel Combustion: Experimental and Kinetic Modeling Study

2011 ◽  
Author(s):  
P. Dagaut ◽  
A. Mze´-Ahmed ◽  
K. Hadj-Ali ◽  
P. Die´vart
Keyword(s):  
Kinetic Modeling ◽  
Jet Fuel ◽  
Synthetic Jet ◽  
Liquid Fuels ◽  
Sensitivity Analyses ◽  
Gas Chromatography Mass Spectrometry ◽  
Infrared Spectrometry ◽  
Temperature Oxidation ◽  
Kinetics Of Oxidation ◽  
Kinetics Of

Fischer-Tropsch liquid fuels synthesized from syngas, also called synthetic paraffinic jet fuel (SPK), can be used to replace conventional petroleum-derived fuels in jet engines. Whereas currently syngas is mostly produced from coal of natural gas, its production from biomass has been reported. These synthetic liquid fuels contain a very high fraction of iso-alkanes, while conventional jet fuels contain large fractions of n-alkanes, cycloalkanes (naphtenes), and aromatics. In that contest, a jet-stirred reactor (JSR) was used to study the kinetics of oxidation of a 100% SPK and a 50/50 SPK/Jet A-1mixture over a broad range of experimental conditions (10 atm, 560 to 1030K, equivalence ratios of 0.5 to 2, 1000 ppm of fuel). The temperature was varied step-wise, keeping the mean residence time in the JSR constant and equal to 1s. Three combustion regimes were observed over this temperature range: the cool-flame oxidation regime (560–740K), the negative temperature coefficient (NTC) regime (660–740K), and the high-temperature oxidation regime (>740K). More than 15 species were identified and measured by Fourier transform infrared spectrometry (FTIR), gas chromatography/mass spectrometry (CG/MS), flame ionization detection (FID), and thermal conductivity detection (TCD). The results consisting of concentration profiles of reactants, stable intermediates and products as a function of temperature showed similar kinetics of oxidation for the fuels considered, although the 100% SPK was more reactive. A surrogate detailed chemical kinetic reaction mechanism was used to model these experiments and ignition experiments taken from the literature. The kinetic modeling showed reasonable agreement between the data and the computations whereas model improvements could be achieved using more appropriate surrogate model fuels. Kinetic computations involving reaction paths analyses and sensitivity analyses were used to interpret the results.

Preparation of (Ti, Al)C Ceramic Coating on Carbon Steel by Electrical Discharge Coating and its Properties Research

2012 ◽  
Vol 531-532 ◽  
pp. 108-113 ◽  
Author(s):  
Guo Liang Li ◽  
Xiao Hua Jie ◽  
Wen Luo
Keyword(s):  
Carbon Steel ◽  
Electrical Discharge ◽  
Ceramic Coating ◽  
X Ray Diffraction ◽  
Compact Structure ◽  
Temperature Oxidation ◽  
Kinetics Of Oxidation ◽  
Resistance Performance ◽  
Kinetics Of ◽  
Energy Disperse Spectroscopy

Multi-component ceramic coating (Ti, Al)C was prepared on the 45 carbon steel by electrical discharge coating (EDC) in kerosene. The (Ti, Al)C coating was analyzed by different methods including X-ray diffraction (XRD), scanning electron spectroscopy (SEM) and energy disperse spectroscopy (EDS).The thermo gravimetric technique was used to approximate the kinetics of oxidation of the (Ti, Al)C coating and the carbon steel and the tribological performance is tested too. The results indicated the thickness of the coating was about 20μm, and the composition of the ceramic coating mainly consisted of (Ti, Al) C and Fe. An oxide film with compact structure formed after 600°C oxidation for 200h, and it was mainly composed of Al2O3 and TiO2, which inhibited further oxygen diffusion into the coating. The (Ti, Al) C coating possessed slow oxidation rate and high temperature oxidation resistance. The coefficient of the coating was lower than that of carbon steel and it had excellent abrasion resistance performance at the load of 100N. Carbon steel lose weight tremendously with an increase at the load of 100, but for the (Ti, Al) C coating the weight loss was very slow.

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