Results 181 to 190 of about 956,457 (232)

Hydrogen permeation through magnesium

Journal of Alloys and Compounds, 1999
Abstract Hydrogen permeation characteristics have been investigated for pure magnesium membranes with a palladium overlayer using a gas permeation technique in the temperature range 473–493 K and in the hydrogen pressure range 0.1–10 kPa. For thicker specimens (thickness >2 mm), the permeation process was rate-controlled by the diffusion of hydrogen ...
M Komaki, C Nishimura, M Amano
exaly   +2 more sources

The effect of permeation area ratio and shape on hydrogen permeation

Scripta Metallurgica et Materialia, 1994
It is generally agreed that the factors influencing permeation and diffusion hydrogen at room temperature are as follows: the thickness and surface condition of the specimen, composition, microstructure and grain size of the material, hydrogen traps and stress or strain conditions for the specimen, etc.
Lun Liu, Lijei Qiao, Wuyang Chu
openaire   +1 more source

Hydrogen permeation into iron

Journal of Applied Physics, 1989
The permeation of deuterium (D) from the gas phase into solution in iron has been measured using a new method based on ion beam analysis. For bare metal surfaces the D uptake was observed to be limited by matrix diffusion through the bulk. The influence of chemisorbed oxygen on the D uptake rate was examined in detail.
openaire   +1 more source

Hydrogen permeation pathways for the hydrogenation reaction of aluminum

Journal of Applied Physics, 2010
The hydrogenation of aluminum is inhibited by the slow diffusion of hydrogen in its hydride AlH3, which covers the surface of aluminum in the initial stages of the reaction. Thus, permeation pathways for hydrogen are introduced by either mixing aluminum powder with boron nitride powder or alloying aluminum with gallium at 10 at. % Ga.
H. Saitoh, A. Machida, Y. Katayama, K. Aoki   +3 more
openaire   +1 more source

Hydrogen permeation through graphite

Journal of Nuclear Materials, 1988
Abstract As a study of the transport processes of hydrogen in graphite, the kinetics of permeation of hydrogen and argon through graphite was investigated in the pressure range of 0.5 to 100 Pa and in the temperature range of 290 to 983 K. The observed results suggested that the hydrogen permeation through graphite can be dealt with as a simple ...
Tsukasa Kiyoshi, Takashi Namba, Michio Yamawaki   +2 more
openaire   +1 more source

Hydrogen Permeation Measurements on Alumina

Journal of the American Ceramic Society, 2004
The aim of this work is to measure the hydrogen transport and solubility parameters in the commercial alumina. Measurements are conducted using a time‐dependent permeation method over the temperature range 1273–1673 K with hydrogen driving pressures in the range 10 4
E. Serra, A. Calza Bini, G. Cosoli, L. Pilloni   +3 more
openaire   +1 more source

Permeation of hydrogen isotopes in nickel

The Journal of Physical Chemistry, 1978
Tritium permeabilities of nickel over the 500 to 1100 K range have been determined and compared to deuterium and protium permeabilities. Solubility data for the three isotopes have been calculated from these permeability data and literature data for diffusivities.
J. T. Bell, J. D. Redman
openaire   +1 more source

Models for hydrogen permeation in metals

Journal of Applied Physics, 1992
Hydrogen transport in metals is affected by processes occurring in the bulk, the surface/bulk, and gas/surface interfaces. Several models have been proposed to explain the permeation process. Here the development of the various models is discussed and the similarities and differences among them are highlighted.
P. L. Andrew, A. A. Haasz
openaire   +1 more source

Hydrogen permeation study with atomic hydrogen beam

Journal of Nuclear Materials, 1992
Hydrogen permeation through Mo and Ni using an atomic hydrogen beam is examined. Different from ion driven permeation (IDP), the hydrogen permeation rate does not show an appreciable spike, keeping the permeation rate at a constant and reproducible value.
openaire   +1 more source

Permeation of hydrogen through metals

Philosophical Magazine, 1959
Abstract The theory of permeation of hydrogen through certain transition metals has been further developed. It has been shown that this theory, in which certain slow phase-boundary processes couple with diffusion to produce the permeation phenomena, can in rather simple ways predict the observed behaviour.
R. Ash, R. M. Barrer
openaire   +1 more source