AVS 64th International Symposium & Exhibition
    Thin Films Division Thursday Sessions
       Session TF-ThP

Paper TF-ThP40
Tribocorrosion Behavior of Ti-6Al-4V Alloy Coated with TaN/Ta Layers in Two Simulated Body Fluids

Thursday, November 2, 2017, 6:30 pm, Room Central Hall

Session: Thin Films Poster Session
Presenter: Jessica Estefania González Sevilla, Universidad de Guadalajara, Mexico
Authors: J.E. González Sevilla, Universidad de Guadalajara, Mexico
M. Flores, Universidad de Guadalajara, Mexico
R. Rosas, Universidad de Guadalajara, Mexico
E. García, Universidad de Guadalajara, Mexico
Correspondent: Click to Email
Ti-6Al-4V alloy is one of the most used materials in biomechanical industry due to the high corrosion resistance as well as its elastic modulus relatively close to that of bone tissue. This material also has excellent biocompatibility and its surface can be treated to promote osseointegration with the host tissue. However, suffer from a low wear resistance in dry and wet conditions. This work focuses on the synthesis of Tantalum Nitride and tantalum layers by magnetron sputtering on substrates of Ti-6Al-4V alloy. TaN and Ta coatings are biocompatible materials, both are chemically stable and TaN has high nanohardness, these properties make the coating of TaN/Ta resistant to the simultaneous attack of corrosion and wear. The structure and composition of coatings were studied by XRD and EDS techniques respectively. Raman spectroscopy and Scanning Electron Microscopy were used to analyze the wear track of the alloy and coated samples. The tribocorrosion tests were made in two different simulated body fluids. One made of deionized water plus salts with the same ions concentration than in human blood and other of Fetal Bovine Serum (FBS) and a compensatory ion solution to reach the ions concentration at blood. The load applied was between 0.5 and 2 N using a ball of Al2O3. Were measured the open circuit potential, friction coefficient and total lost material. The results showed a reduction of the wear, as a consequence of the TaN/Ta coating. The incorporation of proteins by means of FBS in the corrosive medium reduces the friction coefficient.