Fretting corrosion between bone and calcium phosphate-calcium titanate coatings
By Esguerra-Arce, J.; Casta
Published in Wear
2018
Abstract
Biocompatibility is one of the biggest challenges for biomaterials development. This issue arises in the case of coatings. Calcium phosphate (CP) coatings are currently used to cover femoral stem implants, while calcium titanate (CT) has also been proposed as a coating for biomedical applications due to its good biocompatibility and osteoconductivity. However, its behavior under fretting corrosion conditions, one of the degradation mechanisms of hip joint implants, has not been studied. In this work, tribocorrosion behavior of calcium phosphate - calcium titanate coatings obtained by Radio Frequency (RF) magnetron sputtering onto AISI 304 stainless steel was evaluated. The coatings were deposited in 100%CP-0%CT, 75%CP-25%CT, 50%CP-50%CT, 25%CP-75%CT and 0%CP-100%CT volume proportions. An electrochemical cell integrated with a ball-on-flat reciprocating tribometer was used to investigate the performance of the coatings under fretting conditions against bone in Hank