Influence of Phenolic Resin Impregnation on the Properties of Reaction‐Bonded Silicon Carbide

Reaction‐bonded silicon carbide ceramics fabricated from tape casting and Si infiltration have been reported in previous studies. To reduce the residual Si content in the sintered bodies, impregnation of phenol–formaldehyde resin ( PF ) into the porous green preforms before Si infiltration was proposed and studied in this work. The impregnation of PF solution not only helped to reduce the porosity and increase the carbon content of the green preforms, but also improved their strength. As a result, the flexural strength of the RBSC increased a lot and reached 856 ± 161 MP a, whereas the residual Si content was reduced to 10 vol%.