| 摘要 |
The alumina based ceramic composite having high fracture toughness is composed of alumina and metallic niobium as major components. The matrices comprise alumina, alumina-zirconia, alumina-titanium carbide, alumina-silicon carbide whisker or alumina-zirconia-silicon carbide whisker etc., and niobium oxide is used as the source of dispersed particles. The ceramic composite is prepared by (a) homogeneously dispersing niobium particles in the matrix by mixing starting materials which are Al2O3, ZrO2, ZrAl2 and Nb2O5 etc., and (b) reaction sintering of the molded body in inert atmosphere at 1600-1750 deg.C for 30 mins.
|
