Journal
THIN SOLID FILMS
Volume 516, Issue 16, Pages 5162-5167Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2007.07.063
Keywords
adhesion strength; toughness; fluoridated hydroxyapatite coating; nanoindentation
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Adhesion strength and fracture toughness are two crucial mechanical properties for bioceramic coatings on metal implants directly affecting successful implantation and long-term stability. In this study, the adhesion strength of sol-gel derived FHA coatings on Ti6Al4V substrates was measured by pull-out tensile test, and the toughness was assessed by energy release method. With increase of the degree of fluoridation, the adhesion strength increases up to about 40% and the fracture toughness increases about 200 to 300%. Contrary to the wide-spread belief, it is interesting to note that after soaking in the Tris-buffered physiological saline solution (for 21 days), the adhesion strength increases about 60% as compared with the as-deposited coating, instead of decreasing. The mechanism of the increase is discussed. (C) 2007 Elsevier B.V. All rights reserved.
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