Densification Improvement of Al2O3-SiCW Composites by Impregnation?

GUILLERMINA URRETAVIZCAYA; CAVALIERI, A.L.; J.M. PORTO LÓPEZ

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 1995 vol. 21 p. 97 - 99

0272-8842

The effect of the impregnation of A2O3-SIC, composites (0, 5, 10 and 15 ~01% Sic) was studied by Hg porosimetry, density measurements and SEM analysis. Samples were prepared by slip casting, precalcined, impregnated with aluminium nitrate, treated with NH, and pressureless-sintered in reducing atmosphere. Higher fired densities were obtained because of the lower pore volume and higher green densities resulting from the impregnation. Also, the high reactivity of the small particles filling the pores in the impregnated samples contributed to the densification improvement.