Papers by Keyword: ZrO₂-Based Composites

Abstract: The zirconia fiber reinforced ZrO₂ porous composites have been fabricated by precursor infiltration and pyrolysis techniques. The rheological properties and ceramization mechanism of ZrO₂ preceramic solution were observed. The results showed that with the increase of infiltration/ pyrolysis cycles the density of as-prepared composites increased. But the compression strength of composite firstly increased and then decreased, which indicates mechanical properties of composites relevant with density, fiber/matrix interface and porous structure. SEM observation revealed fiber pull-out within samples through 17 infiltration/pyrolysis cycles, which would make contributions to the enhanced mechanical properties of composites.

Abstract: 12 mol%CeO2 based composites were fabricated by a pressureless sintering technique and post-HIP treatments. The mixture of 12CeO2-ZrO2/3Y2O3-ZrO2 (= 80 wt%/20 wt%) powders from various methods were prepared by a ball milling technique and consequently sintered at 1400
in air atmosphere and post-HIP treatment at 1350
. The 12Ce-ZrO2/Y-ZrO2 composites sintered from mixture of 12CeO2-ZrO2 powder and 3Y2O3-ZrO2 powders possessed the high strength over 1300 MPa and also high fracture toughness over 11 MPam1/2. Furthermore, the significant inhibition of the ZrO2 phase transformation of tetragonal to monoclinic phase under an aqueous hydrothermal condition at 150
was obtained for these 12Ce-ZrO2/Y-ZrO2 composites prepared from this method. Microstructural observation was in detail performed by TEM and EDS.