Processing of HA-coated Ti-6Al-4V by a ceramic slurry approach: an in vitro study

Hydroxyapatite-coated titanium alloy composite powders (Ti-6Al-4V/HA) was p roduced by a ceramic slurry approach. The aim was to evaluate the stability of the coating when subjected to a physiological medium simulated body flu id (SBF). Three consolidation conditions (700 degreesC for 5h, 700 degreesC for 8h and 700 degreesC for 11h) were used in the production of the Ti-6Al -4V/HA composite powders. Results showed that biodissolution followed by ap atite precipitation had taken place after soaking in SBF. In addition, it w as found that consolidation at 700 degreesC for Sh resulted in a weak mecha nical locking of calcium phosphate on the Ti-6Al-4V surfaces; and the forma tion of small crystallites, which would increase the dissolution rate. (C) 2001 Elsevier Science Ltd. All rights reserved.