Abstract
The present paper lays the theoretical foundations of a new production process for functionally graded materials (FGMs). The process is based on the evolution of porosity gradients in porous electrodes which undergo electrochemical dissolution or deposition. The electrodes with graded porosity serve as preforms for the production of graded composites by infiltration processing. A one-dimensional macroscopic model of the porous electrode has been used for the prediction of the porosity gradients. A numerical approach allows utilization of experimentally determined current–potential curves for nonporous electrodes, with the incorporation of changes of the pore structure during the course of the electrode reaction, to predict the porosity gradients. For porous copper cathodes and anodes the results of this model are compared with experimentally observed polarization behavior and porosity distributions for different current densities and electrolyte conductivities.
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References
J. M. Marrocino, F. Coeuret and S. Langlois, Electrochim. Acta 32 (1987) 1303.
T. Doherty, J. G. Sunderland, E. P. L. Roberts and D. J. Pickett, ibid. 41 (1996) 519.
J. R. Backhurst, J. M. Coulson, F. Goodridge, R. E. Plimley and M. Fleischmann, J. Electrochem. Soc. 116 (1969) 1600.
C. J. Brown, D. Pletcher, F.C. Walsh, J. K. Hammond and D. Robinson, J. Appl. Electrochem. 24 (1994) 95.
A. Neubrand and J. Rödel, Z. Metallk. 88 (1997) 358.
R. Jedamzik, A. Neubrand and J. Rödel, submitted to J. Mater. Sci.
A. Mortensen and S. Suresh, Internat. Mater. Rev. 40 (1995) 239.
V. S Daniel-Bekh, J. Phys. Chem. (Russian) 22 (1948) 697.
K. J. Euler, ETZ-A Germany 91 (1970) H11.
R. C. Alkire and B. Gracon, J. Electrochem. Soc. 122 (1975) 1594
J. Newman and C. W. Tobias, ibid. 109 (1962) 1183
A. Winsel, Z. Electrochem. 66 (1962) 287.
E. A. Greens II and C. W. Tobias, Ber. Bunsenges. Phys. Chem. 68 (1964) 236.
I. G. Gurevich and V. S. Bagotzky, Electrochim. Acta 9 (1964) 1151.
I. G. Gurevich and V. S. Bagotzky, ibid. 9 (1967) 593.
R. C. Alkire, E. A. Greens II and C. W. Tobias, J. Electrochem. Soc. 116 (1969) 1328.
R. E. Sioda, Electrochim. Acta 16 (1971) 1569.
S. Langlois and F. Coeuret, J. Appl. Electrochem. 20 (1990) 740.
A. Storck, M. A. Enriquez-Granados, M. Roger and F. Coeuret, Electrochim. Acta 27 (1982) 293.
I. Roušar, K. Micka and A. Kimla, ‘Electrochemical Engineering, Chemical Engineering Monographs’, Vol. 21B, Elsevier, Amsterdam (1986).
R. de Levie, in ‘Advances in Electrochemistry and Electrochemical Engineering’, Vol 6, (edited by P. Delahay), Interscience, New York (1967).
F. A. L. Dullien, ‘Porous Media; Fluid Transport and Pore Structure’, 2nd edn., Academic Press, CA. (1992)
A. R. Despic, in ‘Comprehensive Treatise of Electrochemistry’, Vol. 7 ‘Kinetics and Mechanisms of electrode processes’, B. E.Conway, J. O. M. (edited by Bockris, E. Yeager, S. U. M. Khan, R.E. White) Plenum, New York (1983).
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Neubrand, A. Electrochemical processing of porosity gradients for the production of functionally graded materials. Journal of Applied Electrochemistry 28, 1179–1188 (1998). https://doi.org/10.1023/A:1003457008294
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DOI: https://doi.org/10.1023/A:1003457008294