Sputtered nanocrystalline ceramic TiC / amorphous C thin films as potential materials for medical applications

Oláh, Nikolett and Fogarassy, Zsolt and Furkó, Mónika and Balázsi, Csaba and Balázsi, Katalin (2015) Sputtered nanocrystalline ceramic TiC / amorphous C thin films as potential materials for medical applications. CERAMICS INTERNATIONAL, 41 (4). pp. 5863-5871. ISSN 0272-8842

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Abstract

The relationship between structural behaviour of sp uttered TiC / amorphous C (TiC /a:C) thin films and corrosion properties was measured in thre e various pH solutions (0.5 M NaCl (pH=6); 0.1 M HCl (pH=1); 0.1 M NaOH (pH=13). The ~ 400 nm thick nanocomposites were deposited by DC magnetron sputtering on different s ubstrates (Ti6Al4V alloy and CoCrMo alloy) in argon at 25 C° and 0.25 Pa with 150 W inp ut power of carbon target and 50 W input power of titanium target. The structure and composi tion of nanocomposites were investigated by Transmission and Scanning Electron Microscopy. I n both samples the structural investigations confirmed columnar structure of TiC /a:C films with 25-50 nm sized cubic TiC. These columns were separated by 2 - 3 nm thin amorp hous carbon layers. TiC /a:C /Ti6Al4V alloy implant material showed better corrosion resi stance than the TiC /a:C /CoCrMo alloy in 0.5 M NaCl solution based on results of the Electro chemical Impedance Spectroscopy. For both samples, the 0.1 M NaOH solution was the most corrosive media.

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