Tape casting of AlN–SiC–MoSi2 composites

Composites in the system AlN–SiC–MoSi2 were produced by tape casting and sintering. The rheological behaviour of the non-aqueous ceramic suspension was investigated, considering different solvent–deflocculant systems. Slurry formulations were optimised changing the ceramic to total volume ratio and the binder to plasticizer ratio. The characteristics of the green tapes, obtained in different conditions, were studied in terms of apparent density, porosity and microstructure. Sintering tests were carried out under nitrogen atmosphere at temperatures of 1800 and 1850 °C. The density and microstructure of the sintered samples is related to the composition of the tape casting slurries, to the processing procedures and to the sintering conditions. The possibility of tailoring the thickness of the sample by lamination of several tapes has also been evaluated.