Functional Combined Biocoatings on VT-6 Alloy

 
I.Podchernyaeva,
 
V.Lavrenko,
 
V.Lavrenko,
 
I.Uvarova,
  

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2013, #09/10
http://www.materials.kiev.ua/article/892

Abstract

Electrochemical oxidation of spark-deposited coatings from intermetallic ТіАl3 and TiN—3AlN nitride ceramics in 3% NaCl solution leads to a nanosized surface scale layer based on titanium oxides of varying composition: from higher to lower oxides toward the substrate. The highest corrosion resistance is shown by the intermetallic coating, which is confirmed by anodic oxidation polarization curves and layerwise Auger analysis of the protective films of titanium and aluminum oxides. A combined biocoating is produced as follows: ТіАl3 spark-deposited coating based on VT-6 alloy—electrochemical oxidation in 3% NaCl solution—hydroxyapatite coating—subsequent laser fusion. Energy-dispersive X-ray spec-trometry has revealed a wide adhesion interaction area at the interface between the spark-deposited coating and hydroxyapatite, which agrees with smooth variation in microhardness. The coating shows strong adhesion to the substrate and biocompatibility with bone tissue.


CALCIUM HYDROXYAPATITE, COMBINED BIOCOATING, TIAL3 INTERMETALLIC, VT-6 ALLOY, ТІN—3АLN NITRIDE CERAMICS