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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.