Abstract
Eutectic composites consist of twined single crystals and are prepared by solidification of the melt. The properties of eutectic composites are different from those of conventional composites. The high strength of oxide eutectic composites is not lost near 1500℃, and composites such as Al_2O_3-ZrO_2 and Al_2O_3-Y_3Al_5O_<12>(YAG) can be used for ceramic turbine blade. The synthesis of a eutectic composite free from cracks is carried out by unidirectional solidification. This solidification is inadequate to produce large and near-net-shaped materials. Eutectic powders of A12O3-YAG were prepared from the eutectic composite melted by arc discharge. The powder was classified into 3 - 44, 44 - 64 and 64 -124 μm, and consolidated by the spark plasma system (SPS).
