Abstract
The influence of alumina addition on mechanical behavior and fracture properties of all-ceramics zirconia dental materials was evaluated. Samples containing 0, 5, 10, 15 wt.% Al 2 O 3 particles were prepared by cold isostatic pressing (200 MPa) and sintered at 1500°C for 5 h. Commercial powders were investigated by bulk density and phase formation using Archimedes principle and X-ray diffraction (XRD). Bending strength and fracture load were determined at room temperature by three-point bending test. In order to study the fracture, we took points on the crack path under microscope, plotted points on coordinates and used software "Origin" to general fitting curves. Scanning electron microscopy (SEM) and atomic force microscope (AFM) were introduced to estimate the particle size of powders and observe the fracture surfaces. No density difference was observed for a given alumina content. The majority phases of ceramics were t-zirconia and α-alumina before breaking while m-zirconia, t-zirconia and α-alumina coexisted on the cross section of cracked samples. Zirconia containing 10% alumina had the best mechanical properties, the most tortuous crack propagation and the least obvious crack distribution. This observation may provide a reference for the materials selection, shape design and production process of all-ceramic crown and bridge.
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