Thermal desorption kinetics of H2O and H2 from rapidly solidified Al-Zn-Mg alloy powders

2020 ◽  
Vol 686 ◽  
pp. 178554
Author(s):  
R. Ben David ◽  
T. Ohaion-Raz ◽  
G. Rafailov ◽  
A. Danon ◽  
Y. Finkelstein
Keyword(s):  
Thermal Desorption ◽  
Mg Alloy ◽  
Desorption Kinetics ◽  
Rapidly Solidified ◽  
Kinetics Of

The Role of Cr in H Desorption Kinetics in Rapidly Solidified Al

2014 ◽  
Vol 783-786 ◽  
pp. 264-269 ◽  
Author(s):  
Iya I. Tashlykova-Bushkevich ◽  
Keitaro Horikawa ◽  
Goroh Itoh
Keyword(s):  
High Temperature ◽  
Thermal Desorption ◽  
High Purity ◽  
Thermal Desorption Spectroscopy ◽  
Secondary Phase ◽  
Hydrogen Desorption ◽  
Oxide Surface ◽  
Desorption Kinetics ◽  
Hydrogen Trapping ◽  
Rapidly Solidified

Hydrogen desorption kinetics for rapidly solidified high purity Al and Al-Cr alloy foils containing 1.0, 1.5 and 3.0 at % Cr were investigated by means of thermal desorption analysis (TDA) at a heating rate of 3.3°C/min. For the first time, it was found that oxide inclusions of Al2O3 are dominant high-temperature hydrogen traps compared with pores and secondary phase precipitates resulted in rapid solidification of Al and its alloys. The correspondent high-temperature evolution rate peak was identified to be positioned at 600°C for high purity Al and shifted to 630°C for Al-Cr alloys. Amount of hydrogen trapped by dislocations increases in the alloys depending on Cr content. Microstructural hydrogen trapping behaviour in low-and intermediate temperature regions observed here was in coincidence with previous data obtained for RS materials using thermal desorption spectroscopy (TDS). The present results on hydrogen thermal desorption evolution indicate that the effect of oxide surface layers becomes remarkable in TDA measurements and show advantages in combinations of both desorption analysis methods to investigate hydrogen desorption kinetics in materials.

Desorption kinetics of hydrogen and deuterium from Si(111) 7×7 studied using laser‐induced thermal desorption

1988 ◽  
Vol 89 (3) ◽  
pp. 1709-1718 ◽  
Author(s):  
B. G. Koehler ◽  
C. H. Mak ◽  
D. A. Arthur ◽  
P. A. Coon ◽  
S. M. George
Keyword(s):  
Thermal Desorption ◽  
Desorption Kinetics ◽  
Kinetics Of

Associative desorption from adlayers of interacting particles: nitric oxide on Pt, Ni and Ru

1980 ◽  
Vol 370 (1743) ◽  
pp. 545-560 ◽  
Keyword(s):  
Thermal Desorption ◽  
Product Distribution ◽  
Desorption Kinetics ◽  
Lateral Interactions ◽  
Model Calculations ◽  
Mechanical Methods ◽  
Analytic Expressions ◽  
Statistical Mechanical ◽  
Kinetics Of ◽  
Quantitative Account

The kinetics of associative desorption from mixed adlayers containing two kinds of particles (N and 0) have been examined. Standard statistical mechanical methods have been employed to study the effects of lateral interactions (ω NN , ω NO , ω OO ) between near-neighbour particles on the desorption kinetics while the adlayer stoichiometry varies continuously during a desorption sweep. Although the most general case ω NN ≠ ω NO ≠ ω OO ≠ 0) is found to be mathematically intractable, either one of two useful approximations can lead to analytic expressions for the desorption rate of N 2 , NO and O 2 . Both of these approximations have been used to simulate the thermal desorption spectra from a 1:1 layer of N and O atoms absorbed on Pt, Ni and Ru surfaces. The results show that, although the operation of lateral interactions can profoundly affect the desorption kinetics of these systems they cannot significantly alter the product distribution. N 2 and O 2 are overwhelmingly the major products, with NO desorption being entirely negligible in every case. We therefore conclude that observations of molecular NO in thermal desorption in these systems is evidence of molecularly adsorbed NO on the surface. Such desorption of NO is not due to recombination of surface N and O atoms. Reasonable values of the interaction parameters are used in model calculations which give a fairly good quantitative account of the available experimental data. The comparison with experiment leads to the conclusion that O-O repulsions are significant in every case. The N-N interaction is either zero or slightly attractive on Pt and Ni, but is very definitely repulsive on Ru.

Measurement of fast desorption kinetics of D2, from tungsten by laser induced thermal desorption

1978 ◽  
Vol 78 (3) ◽  
pp. 545-564 ◽  
Author(s):  
J.P. Cowin ◽  
D.J. Auerbach ◽  
C. Becker ◽  
L. Wharton
Keyword(s):  
Thermal Desorption ◽  
Desorption Kinetics ◽  
Kinetics Of

Thermal desorption kinetics of hydrogen on rhodium (110)

1994 ◽  
Vol 303 (1-2) ◽  
pp. 1-15 ◽  
Author(s):  
H.J. Kreuzer ◽  
Zhang Jun ◽  
S.H. Payne ◽  
W. Nichtl-Pecher ◽  
L. Hammer ◽  
...  
Keyword(s):  
Thermal Desorption ◽  
Desorption Kinetics ◽  
Kinetics Of

The Kinetics of Hydrogen Desorption From Zirconium Hydride

2013 ◽  
Author(s):  
Mingwang Ma ◽  
Ruiyun Wan ◽  
Yuan Wang ◽  
Yanlin Cheng ◽  
Li Liang ◽  
...  
Keyword(s):  
Thermal Desorption ◽  
Thermal Desorption Spectroscopy ◽  
Hydrogen Desorption ◽  
Pressure Effects ◽  
Zirconium Hydride ◽  
Desorption Kinetics ◽  
Desorption Process ◽  
Exponential Factor ◽  
Predict Weight Loss ◽  
Kinetics Of

Thermal desorption spectroscopy (TDS) was used to study the thermal desorption kinetics of zirconium hydride films, which were deposited on molybdenum substrates and thermally charged with gas phase hydrogen. The observed desorption peaks were attributed to phase transforming steps. The activation energy and pre-exponential factor for desorption kinetics was estimated as 116 kJ/mol and 8762 s−1 according to Kissinger relation, respectively. A simulation of TDS spectra was made, which showed that the desorption process followed a first order kinetics. The kinetic parameters were then utilized to predict weight loss behavior at a temperature profile. Pressure effects that can potentially reduce the desorption rate were discussed.

Desorption Kinetics of Cadmium and Lead from Goethite

2002 ◽  
Vol 66 (3) ◽  
pp. 797 ◽  
Author(s):  
Leslie J. Glover ◽  
Matthew J. Eick ◽  
Patrick V. Brady
Keyword(s):  
Desorption Kinetics ◽  
Cadmium And Lead ◽  
Kinetics Of
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