The addition of sintering additives to silicon carbide particles by electrostatic adsorption of colloidal AI,O, and Y,O, sols has been studied as a way to achieve an optimum homogeneity in the microstructure. The adsorption behavior of the sol particles was examined by electrophoretic measurements and X-ray fluorescence analysis. Both AI,O, and Y,O, sols could simultaneously be adsorbed on the S i c particle surfaces. Viscosity measurements showed that the colloidal sol particles had a stabilizing effect on the slip, and hence slips with relatively high solid loadings could be prepared without adding extra dispersing agent. Liquid-phase-sintered silicon carbide materials (LPS-Sic) with 2 wt % A1,0, and 1 wt% Y,O, were prepared by freeze granulation/ pressing and sintering at 1880°C for 4 h. The homogeneity of the green compacts was quantified using a spot analysis technique in an electron probe microanalyzer. It was clearly shown that the addition of sols gave a more homogeneous microstructure than the reference sample with Y,O, and A1,0, added as powders. The addition of sintering additives as sols also enhanced the sintering behavior.
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