Accession Number : ADP014299


Title :   Stoichiometry, Crystallinity, and Nano-Scale Surface Morphology of the Graded Calcium Phosphate-Based Bio-Ceramic Interlayer on Ti-A1-V


Descriptive Note : Conference proceedings


Corporate Author : NANYANG TECHNOLOGICAL UNIV (SINGAPORE)SCHOOL OF ELECTRONIC AND ELECTRICAL ENGINEERING


Personal Author(s) : Long, J. D. ; Ostrikov, K. ; Xu, S. ; Ligatchev, V.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADP014299


Report Date : 2003


Pagination or Media Count : 6


Abstract : A plasma-assisted concurrent Rf sputtering technique for fabrication of biocompatible, functionally graded CaP-based interlayer on Ti-6Al-4V orthopedic alloy is reported. Each layer in the coating is designed to meet a specific functionality. The adherent to the metal layer features elevated content of Ti and supports excellent ceramic-metal interfacial stability. The middle layer features nanocrystalline structure and mimics natural bone apatites. The technique allows one to reproduce Ca/P ratios intrinsic to major natural calcium phosphates. Surface morphology of the outer, a few to few tens of nanometers thick, layer, has been tailored to fit the requirements for the bio-molecule/protein attachment factors. Various material and surface characterization techniques confirm that the optimal surface morphology of the outer layer is achieved for the process conditions yielding nanocrystalline structure of the middle layer. Preliminary cell culturing tests confirm the link between the tailored nano-scale surface morphology, parameters of the middle nanostructured layer, and overall biocompatibility of the coating.


Descriptors :   *SYMPOSIA , *STOICHIOMETRY , *CRYSTALLOGRAPHY , *TITANIUM ALLOYS , *NANOSTRUCTURES , CRYSTAL STRUCTURE , MORPHOLOGY , FABRICATION , CERAMIC MATERIALS , BIOENGINEERING , SINGAPORE.


Subject Categories : COATINGS, COLORANTS AND FINISHES
      PROPERTIES OF METALS AND ALLOYS


Distribution Statement : APPROVED FOR PUBLIC RELEASE