Preparation of CePO4Modified ZrO2Ceramics with Different Particle Sizes and Their Mechanical Behaviors

[摘要] Different particle size 3 mol% Y2O3-stabilized tetragonal zirconia polycrystalline (3Y-TZP) coated with CePO4was prepared by a coprecipitation method and the effect of zirconia particle-size on its mechanical properties was investigated. The phase composition and microstructure of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), respectively. The machining characteristic of as-prepared samples was calculated to be 0.54 for a zirconia particle size of around 30–50 nm. In this grain size range, the hardness, fracture toughness, and bending strength of the coated sample were found to be 10.72 GPa, 5.76 MPa·m1/2, and 463 MPa. Our results show that the grain size of the zirconia before coating greatly influences the mechanical properties of the coated samples because the different particle sizes result in different fracture styles.

[学科分类] 材料工程