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 tapes (about 60 similar to 80 tapes) were prepared by stacking in turn the composition (B) and (C), laminating under 10 MPa pressure, eliminating the solvent and burning out the polymer additives. The final green bodies were hot pressed at 1750 degrees C and 30 MPa. The composite has 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 growth in B. The curves of GTA indicates that all organic additives could be removed completely above 600 degrees C.