Rapid Production of Bulk Al2O3/YAG/YSZ Ternary Eutectic Ceramic by Ultra-High-Gravity Melt-Casting

Abstract:

A new method of rapid preparation for compact bulk Al2O3/YAG/YSZ ternary eutectic ceramics was researched. With Al/Fe2O3/Y2O3/ZrO2 as starting materials, the combustion synthesis reaction of Al/Fe2O3 was ignited, and then the molten compounds consisting of ceramics (Al2O3/YAG/YSZ) and metal (Fe) were achieved; afterwards the complete separation of ceramics melt from Fe melt and the solidification of the ceramics were realized under ultra-high-gravity field. The previously-solidified ceramics partially sank into the Fe melt, where the ceramics was forced to be entirely solidified by the instantaneous isostatic pressure on the verge of 2 MPa. The microstructure analysis results show that phase composition and morphology of grains of the obtained Al2O3/YAG/YSZ ternary eutectic ceramics have clearly gradient character along the ultra-high-gravity direction.