COMPARATIVE STUDIES OF COLD AND THERMAL SPRAYED HYDROXYAPATITE COATINGS FOR BIOMEDICAL APPLICATIONS- A REVIEW

摘要

Various conventional spray techniques have been exploited for more than two decades to coat bio-ceramics such as Hydroxyapatite (HAP) and its composites on metallic substrates for biomedical applications besides many limitations viz. residual stresses, evaporation, phase alterations and de-bonding etc. Cold spray technology overcome number of traditional thermal spray shortcomings and has been studied for engineering metallic materials. Deposition of HAP and its composites using cold spraying is still unexploited and holds tremendous potential in dental and orthopedic implant applications. This review will enumerate the research works and other crucial aspects of HAP deposition using thermal spraying. Present R&D efforts of cold spraying will be discussed and compared with the conventional spraying techniques. Studies and their conclusions related with synthesis, characterization, electrochemical evaluation and other valuable information of HAP will be extensively focused. In light of relative merits and demerits, research gap of using cold spraying for HAP deposition will be proposed and concluded.