The Preparation and Properties of Layered TCP/Y–TZP Composites with Ribbon-Like Microstructures
The repeated-deformation processing technique was used in the preparation of layered tricalcium phosphate (TCP)/yttria partially stabilized tetragonal zirconia (Y-TZP) composites with ribbon-like microstructures. The fabrication technique involved repeated plastic deformation of layered green tapes, which are stacked together to form starting bi-material laminates, burn-out of the organic vehicle, and sintering at 1300°C. At this rather low sintering temperature, which was chosen to prevent the extensive diffusion of the calcium into the Y-TZP, the zirconia layers could not be fully densified. In spite of the relatively low fractional density (about 75% TD) of these layers, flexural strength values exceeding 100 MPa were achieved with these composites, 150% higher than the matrix material. During autoclaving in water at 200oC for 24 hours no t-m transformation of the zirconia phase took place, indicating full stability of the porous zirconia layers in these composites under the hydrothermal conditions used in this study.
Takashi Nakamura, Kimihiro Yamashita and Masashi Neo
T. Kosmač and A. Dakskobler, "The Preparation and Properties of Layered TCP/Y–TZP Composites with Ribbon-Like Microstructures ", Key Engineering Materials, Vols. 309-311, pp. 1145-1148, 2006