| Fabrication of SiCf/SiC Composites using an Electrophoretic Deposition |
| Jong-Hyun Lee, Gun-Young Gil, Dang-Hyok Yoon |
| School of Materials Science and Engineering, Yeungnam University |
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| ABSTRACT |
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Continuous SiC fiber-reinforced SiC composites ($SiC_f$/SiC) were fabricated by electrophoretic deposition (EPD). Nine types of slurries with different powder contents, binder resin amounts and slurry pH were deposited on Tyranno$^{TM}$-SA fabrics by EPD at 135 V for ten minutes to determine the optimal conditions. Further EPD using the optimum slurry conditions was performed on fabrics with four different pyrolitic carbon (PyC) thicknesses. The density of the hot-pressed composites decreased with increasing PyC thickness due to the difficulty of infiltrating the slurry into the narrow gaps between the fibers. On the other hand, the mechanical strength increased with increasing PyC thickness despite the decrease in density, which was explained by the enhanced crack deflection with increasing PyC thickness. The $SiC_f$/SiC composites showed the highest density and flexural strength of 94% and 342 MPa, respectively, showing EPD as a feasible method for dense $SiC_f$/SiC fabrication. |
| Key words:
Slurry, Zeta potential, Electrophoretic deposition, $SiC_f$/SiC composite, Hot pressing |
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