title: Evaluating interface strength of calcium phosphate sol-gel-derived thin films to Ti6Al4V substrate.
abstract: The interface shear strength of Ca-P thin films applied to Ti6Al4V substrates have been evaluated in this study using a substrate straining method--a shear lag model. The Ca-P films were synthesized using sol-gel methods from either an inorganic or organic precursor solution. Strong interface bonding was demonstrated for both film types. The films were identified as non-stoichiometric hydroxyapatite but with different Ca/P ratios. The Ca-P films were 1-1.5 microm thick and testing and analysis using the shear lag approach revealed a shear strength of approximately 347 and 280 MPa for Inorganic and Organic Route-formed films, respectively. Overall, the exceptional mechanical properties of Ca-P/Ti6Al4V system along with the inherent advantages of sol-gel processing support continued studies to utilize this technology for bone-interfacing implant surface modification.
authors.affiliation: Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON, Canada M5S 3E3.
authors.forename: Lu
authors.initials: L
authors.lastname: Gan
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Robert M
authors.initials: RM
authors.lastname: Pilliar
mesh_terms: D000268:Adhesiveness; D000327:Adsorption; D000497:Alloys; D002130:Calcium Phosphates / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000032:analysis / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D008422:Materials Testing / Q000379:methods*; D008567:Membranes, Artificial; D044367:Phase Transition; D033081:Shear Strength; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D002130:Calcium Phosphates; D020099:Coated Materials, Biocompatible; D008567:Membranes, Artificial; C031462:titanium alloy (TiAl6V4); C020243:calcium phosphate; D014025:Titanium