Abstract
The role of tin dioxide (SnO2) interphase for the alumina/glass composite system was investigated using fractography. Alumina (Al2O3) and glass form a strong chemical bond which is undesirable for toughness in a ceramic matrix composite. SnO2 interphase was incorporated to prevent this strong bond between alumina and glass. SnO2 was deposited on Al2O3 substrates via chemical vapour deposition and bonded with glass. The role of the interphase was then studied by characterizing the fracture surfaces of the bend test and special composite disc samples loaded in diametral compression. Bend tests results showed that the SnO2 interphase and/or the SnO2/Al2O3 interface acted as a plane of weakness. Secondary cracking at 90° to the major crack direction was observed along this plane of weakness, which appears to be in accord with the Cook and Gordon model. Crack deflection and secondary cracking were also observed in the SnO2 region of the compression samples. These results indicate the suitability of SnO2 interphase for the alumina/glass composite system.
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Siadati, M.H., Chawla, K.K. & Ferber, M. The role of the SnO2 interphase in an alumina/glass composite: a fractographic study. J Mater Sci 26, 2743–2749 (1991). https://doi.org/10.1007/BF00545563
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DOI: https://doi.org/10.1007/BF00545563