title: Compositional variations in the surface and interface of calcium phosphate ceramic coatings on Ti and Ti-6Al-4V due to sintering and immersion.
abstract: The compositions of the surface and the interface of calcium phosphate ceramic (CPC) coatings electrophoretically deposited and sintered on titanium or its alloy, were determined by scanning Auger electron spectroscopy before and after 4 wk of immersion in a simulated physiological solution. In the CPC coating-metal interfaces, the phosphorus diffused beyond the titanium oxide layer. The phosphorus concentration in the interface followed a Gaussian distribution for both unalloyed and alloyed titanium. The diffusion depleted P in the ceramic adjacent to the metal. The surface of the ceramic, however, was substantially unchanged. A major change in the compositional depth profiles was induced by immersion: thick and uniform titanium phosphide layers of constant composition were observed on the Ti-based metal substrates.
authors.affiliation: Department of Bioengineering, University of Pennsylvania, Philadelphia 19104.
authors.forename: C S
authors.initials: CS
authors.lastname: Kim
authors.forename: P
authors.initials: P
authors.lastname: Ducheyne
mesh_terms: D000497:Alloys; D001672:Biocompatible Materials; D002130:Calcium Phosphates / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D006358:Hot Temperature; D008422:Materials Testing; D012996:Solutions; D013057:Spectrum Analysis; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D002130:Calcium Phosphates; D012996:Solutions; C485828:alpha-tricalcium phosphate; C485830:tetracalcium phosphate; C031462:titanium alloy (TiAl6V4); C485838:calcium phosphate, monobasic, anhydrous; C020243:calcium phosphate; D014025:Titanium; C485829:calcium phosphate, dibasic, anhydrous