Conclusions
The destruction of tin-oxide ceramic by glass takes place rapidly, despite the absence of marked penetration of molten glass into the pores of the material, i.e., the low impregnation is not an essential condition for high corrosion resistance.
The corrosion is linked with the change in the structure of the material, expressed by the increase in its dispersion and the development of a large number of fine, weakly interbonded grains with subsequent penetration between them of glass, bloating, and breakdown into separate fragments.
The least corrosion by lead glass is exhibited by tin oxide ceramic with clearly expressed crystals bonded by dense intergrain contacts, regardless of the total porosity.
The most intense corrosion is typical of a material with badly formed intergrain faces, and a high open porosity. Even prolonged service at high temperatures in contact with glass does not lead to marked growth of the grains and their regular delimitation.
The most resistant to corrosion turned out to be a material with a well-formed granular structure, with a pore volume of about 9.1 mm3/g, and pores measuring 10–20 μm. In service it is completely impregnated with glass.
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Translated from Ogneupory, No. 2, pp. 24–29, February, 1989.
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Mel'nikova, I.G., Kaplan, F.S. & Fedorova, V.V. Mechanism of corrosion of tin-oxide electrodes. Refractories 30, 91–96 (1989). https://doi.org/10.1007/BF01292548
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DOI: https://doi.org/10.1007/BF01292548