title: Evaluating mechanical adhesion of sol-gel titanium dioxide coatings containing calcium phosphate for metal implant application.
abstract: The adhesion of thin (< 10 microm) sol-gel calcium phosphate-titanium dioxide films bonded to a titanium substrate was studied using two different tests: a rotating-bending test and a tensile bond test. The former evaluates the impact of both the coating procedure and the surface pre-treatment on the resistance to fatigue of the substrate as well as the adhesion of the coating; the latter measures the tensile adhesion strength of the coating. Both tests gave similar results. A reduction of the thickness of the coating or an increase of the roughness of the substrate improves the quality of the interface. A comparison of the adhesion of the calcium phosphate-titanium dioxide film with that of a pure calcium phosphate coating obtained by a similar route suggests the involvement of a chemical component in the binding.
authors.affiliation: Institut de Physique, Unirersité de Fribourg, Switzerland. piveteau@mit.edu
authors.forename: L D
authors.initials: LD
authors.lastname: Piveteau
authors.forename: B
authors.initials: B
authors.lastname: Gasser
authors.forename: L
authors.initials: L
authors.lastname: Schlapbach
mesh_terms: D002130:Calcium Phosphates / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D005782:Gels; D008422:Materials Testing; D018583:Pliability; D019736:Prostheses and Implants; D012399:Rotation; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*; D014783:Viscosity
chemical_list: D002130:Calcium Phosphates; D020099:Coated Materials, Biocompatible; D005782:Gels; C485817:beta-tricalcium phosphate; C009495:titanium dioxide; D014025:Titanium; C018392:tricalcium phosphate