Article ID Journal Published Year Pages File Type
8948580 Journal of the European Ceramic Society 2018 10 Pages PDF
Abstract
β-tricalcium phosphate (β-TCP) coatings were synthesized on tetragonal zirconia (Y-TZP) discs by heating the apatite coating between 800 °C and 1200 °C. The study results suggest that heating temperature has a strong influence on the coating bond strength and microstructure of the substrate/coating interface. The β-TCP coatings fired at 800 °C and 900 °C exhibited excellent tensile bond strength (∼50 MPa) while heating at 1100 °C and 1200 °C led to decreased bond strength (∼30 MPa) as the result of substantial structural and microstructural changes: diffusion of Y3+ from the zirconia substrate in the coating resulting in partial crystal transformation (t-m) of zirconia, formation of surface uplifts and nanoporosity in zirconia, as well as generation of large residual thermal stresses leading to microcracking of the β-TCP coatings. However, these structural changes did not have any measurable effect on the flexural strength of the bulk zirconia substrates.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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