Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8948580 | Journal of the European Ceramic Society | 2018 | 10 Pages |
Abstract
β-tricalcium phosphate (β-TCP) coatings were synthesized on tetragonal zirconia (Y-TZP) discs by heating the apatite coating between 800â¯Â°C and 1200â¯Â°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 800â¯Â°C and 900â¯Â°C exhibited excellent tensile bond strength (â¼50â¯MPa) while heating at 1100â¯Â°C and 1200â¯Â°C led to decreased bond strength (â¼30â¯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
Authors
Martin Stefanic, Tomaž KosmaÄ,