Fabrication of nanostructure Al_2O_3/ZrO_2 (Y_2O_3) eutectic by combustion synthesis melt-casting under ultra-high gravity

摘要

A novel method for preparing Al_2O_3/ZrO_2 (Y_2O_3) eutectic was developed by combining combustion synthesis with melt-casting under ultra-high gravity (CSMC-UHG). The application of UHG = 800g resulted in a high relative density of 99.8%, and an orientation-growth along the UHG direction. The microstructure was composed of aligned growth regimes containing a triangular dispersion of orderly ZrO_2 rods in Al_2O_3 matrix with a spacing of 300 nm. The eutectic had a high fracture toughness up to 17.9 MPa·m~(1/2), which was mainly attributed to the nanostructure and the elastic bridge effects of the aligned ZrO_2 rods.