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

Published online by Cambridge University Press:  31 January 2011

Mario Aparicio  and
Alicia Durán
Mario Aparicio
Affiliation:
Instituto de Cerámica y Vidrio (CSIC), E-28500 Arganda del Rey, Madrid, Spain
Alicia Durán
Affiliation:
Instituto de Cerámica y Vidrio (CSIC), E-28500 Arganda del Rey, Madrid, Spain
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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.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4230 - 4238
Copyright
Copyright © Materials Research Society 1999

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