TAPE CASTING OF AL2O3-TIB2 AL2O3-NANO-TIC MULTILAYER COMPOSITES/

Ceramic tapes, containing Al2O3-25 wt pet TiB2(B) and Al2O3-25 wt pet nano-TiC (c), have been obtained by tape casting process. Numerous tap es (about 60 similar to 80 tapes) were prepared by stacking in turn th e composition (B) and (C), laminating under 10 MPa pressure, eliminati ng the solvent and burning out the polymer additives. The final green bodies were hot pressed at 1750 degrees C and 30 MPa. The composite ha s a bending strength of 568 MPa and a fracture toughness of 5.8 MPa.m( 1/2). SEM analysis exhibits that Al(2)O3 particle growth was inhibited by TIC particles in C, but TiB2 particles could not hinder Al2O3 grow th in B. The curves of GTA indicates that all organic additives could be removed completely above 600 degrees C.