Application of a Novel Refinement Method for Accurate Determination of Chemical Diffusion Coefficients in Electroactive Materials by Potential Step Technique

2005 ◽  
Vol 152 (2) ◽  
pp. E61 ◽  
Author(s):  
M. D. Levi ◽  
R. Demadrille ◽  
A. Pron ◽  
M. A. Vorotyntsev ◽  
Y. Gofer ◽  
...  
Keyword(s):  
Diffusion Coefficients ◽  
Accurate Determination ◽  
Chemical Diffusion ◽  
Potential Step ◽  
Electroactive Materials ◽  
Refinement Method

Determination of Concentration Dependent Diffusion Coefficients of Carbon in Expanded Austenite

2008 ◽  
Vol 273-276 ◽  
pp. 306-311 ◽  
Author(s):  
Thomas S. Hummelshøj ◽  
Thomas L. Christiansen ◽  
Marcel A.J. Somers
Keyword(s):  
Diffusion Coefficient ◽  
Weight Change ◽  
Diffusion Coefficients ◽  
Input Data ◽  
Accurate Determination ◽  
Experimental Conditions ◽  
Thin Foils ◽  
Expanded Austenite ◽  
Aisi 316

In the present paper various experimental procedures to experimentally determine the concentration dependent diffusion coefficient of carbon in expanded austenite are evaluated. To this end thermogravimetric carburization was simulated for various experimental conditions and the evaluated composition dependent diffusivity of carbon derived from the simulated experiments was compared with the input data. The most promising procedure for an accurate determination is shown to be stepwise gaseous carburizing of thin foils in a gaseous atmosphere; the finer the stepsize, the more accurate the approximation of the diffusivity. Thermogravimetry was applied to continuously monitor the weight change of thin foils of AISI 316 during carburizing in CO-H2 gas mixtures for one of the simulated experimental procedures.

Simultaneous Determination of Chemical Diffusion and Surface Exchange Coefficients of Oxygen by the Potential Step Technique

1999 ◽  
Vol 146 (7) ◽  
pp. 2606-2612 ◽  
Author(s):  
Stefan Diethelm ◽  
Alexandre Closset ◽  
Kemal Nisançioglu ◽  
Jan Van herle ◽  
A. J. McEvoy ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Chemical Diffusion ◽  
Surface Exchange ◽  
Potential Step
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