Characterization and In Vitro Bioactivity of Calcium and Phosphorous Containing Titania Layer on Ti6Al4V Alloy

Abstract

Calcium and phosphorous containing titania layers on Ti6Al4V biomedical alloy were formed by micro arc oxidation (MAO) in an electrolyte containing calcium acetate and sodium phosphate, and then subjected to hydrothermal treatment (HT) in order to achieve improved biocompability with modified titania layer. Samples were hydrothermally treated in water solution whose pH was adjusted to 11.0-11.5 by adding NaOH, at 230 °C for 10 h and cooled in the autoclave . Surface morphology, microstructure, and phase com position of titania layer were investigated systematically before and after HT. Their biomimetic apatite inducing ability in a simulated body fluid (SBF) was investigated. The bioactivity tests of modified MAO surface on Ti6Al4V alloy showed a considerable improvement compared to the unmodified MAO surface. Abstract: Ti6Al4V biomedikal titanyum alasimi uzerinde kalsiyum asetat ve sodyum fosfat iceren elektrolit icinde gerceklestirilen mikro ark oksidasyon islemi ile kalsiyum ve fosfor iceren titanyum oksit tabakasi olusturulmustur. Olusturulan oksit tabakasinin biyomimetik apatit olusturma ozelligini iyilestirmek amaciyla numuneler 10 saat sureyle 230 °C'de sodyum hidroksit iceren sulu cozelti icerisinde hidrotermal isleme maruz birakilmistir. Numunelerin yu zey morfolojileri, oksit tabakalarin mikroyapisi ve faz kompozisyonlari hidrotermal islem oncesi ve sonrasinda incelenmistir. Numunelerin biyomimetik apatit olusum karakteristigi incelemesi yapay vucut sivisi icinde gerceklestirilmistir. Mikro ark oksidasy on islemini takiben uygulanan hidrotermal islem sonucunda Ti6Al4V numunenin yuzeyinde biyomimetik apatit olusumunun iyilestigi gozlemlenmistir.