2024-03-28T23:07:19Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/630502016-05-04T10:46:49Zcom_10261_78com_10261_3col_10261_331
Pascual, M. Jesús
Pascual, Luis
Valle Fuentes, Francisco José
2012-12-17T12:02:42Z
2012-12-17T12:02:42Z
2003
Journal of the American Ceramic Society 86 [11] 1918–26 (2003)
0002-7863
http://hdl.handle.net/10261/63050
The development of a new sealant for molten carbonate fuel
cells (MCFC) requires a study of the attack of molten carbonates on selected materials. Silica and Pyrex glasses have
better corrosion resistance against molten carbonates than
other glasses, but they have unsuitable thermal expansion
coefficients. Comparisons have also been made between borosilicate glasses of suitable thermal expansion for sealants for
MCFC and silica and Pyrex glasses. The corrosion kinetics in
molten carbonates follows two limiting relations and involves
two corrosion mechanisms. The weight loss varied linearly
with time, indicating a dissolution of the glass network at short
times. Longer times show corrosion, depending on the square
root of time, typical of a diffusion mechanism and indicating
formation of a protective layer on the surface of the glass. The
main crystalline corrosion product is lithium methasilicate.
The glass-corrosion rate follows the well-known Arrhenius
law. These studies used scanning electron microscopy, X-ray
diffraction, X-ray photoelectron spectroscopy, and chemical
analysis. A general corrosion mechanism of borosilicate glasses
in molten carbonates is proposed.
eng
openAccess
Corrosion of Borosilicate Sealing Glasses for Molten Carbonate Fuel Cells
artículo