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Infiltration of C/SiC composites with silica sol-gel solutions: Part I. Infiltration by dipping

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Abstract

Oxidation resistance of ceramic matrix composites (CMC) of SiC reinforced with C fibers (C/SiC) can be improved by filling the residual porosity. The aim of this work was to design and analyze a dipping infiltration process under ambient conditions (1 atm pressure and room temperature) with silica sol-gel solutions prepared from tetraethyl orthosilicate. Different substrates and solutions have been studied. Thermal treatments, i.e., curing or sintering between infiltrations, increase the efficiency of the process since the densification of infiltrated silica opens up the remaining porosity. Increasing viscosity and/or concentration of the solution lead to greater weight gains. Weight gains are higher in the initial stages of the process because larger diameter porosity remains unfilled. As the process advances, the average pore size decreases, and only the lower viscosity solution can enter the residual porosity.

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  1. Instituto de Cerámica y Vidrio (CSIC), E-28500, Arganda del Rey, Madrid, Spain

    Mario Aparicio & Alicia Durán

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  1. Mario Aparicio
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  2. Alicia Durán
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Aparicio, M., Durán, A. Infiltration of C/SiC composites with silica sol-gel solutions: Part I. Infiltration by dipping. Journal of Materials Research 14, 4230–4238 (1999). https://doi.org/10.1557/JMR.1999.0573

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  • DOI: https://doi.org/10.1557/JMR.1999.0573

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