The Protective Behaviour of Titanium Nitride Coatings
Abstract
The experiments conducted to obtain a thin layer of nitride through the vapour chemical deposition method have followed an original path to obtain TiN directly in the working room thus avoiding the import of these hazardous substances. In this paper, the protective behaviour of titanium nitride coatings onto hard carbide substrate was investigated using scanning electron microscope (SEM), X-ray diffractometer (XRD) and Knoop hardness. Scanning Electron Microscope was used to investigate the coating morphology and interface structure. X-ray mapping was also performed to characterize the elements in a semi-quantitative analysis. Dron X-ray diffractometer with Mo Kα radiation operating was used for phase(s) identification. Microhardness value (Knoop hardness) measured in the coating layer was 28.000 MPa. CVD TiN coatings usually show only moderate or even poor corrosion protection for hard carbide substrates.
References
[2]. S. Constantinescu, Nitride coatings on widia substrate for mechanical applications, Journal Surface Engineering, vol. 1, p. 77-81, 2009.
[3]. S. Constantinescu, T. Radu, Advanced methods of obtaining thin coats, Ed. Ştiinţifică F.M.R. ISBN 973-8151-25-2, Bucureşti, 2003.
[4]. I. M. Notter, D. R. Gabe, Porosity of Electrodeposited Coatings: Its Cause, Nature, Effect and Management, Corrosion Reviews, 10 (3-4), p. 217-280, 1992.
[5]. J. Munemasa, T. Kumakiri, Effect of the Surface Roughness of Substrate on the corrosion properties of fims coated by Physical Vapour Deposition, Surface and Coatings Technology, 49, p. 496-499, 1991.
[6]. L. Orac, V. Grechanyuc, Corrosion resistance of the composites Cu-Mo obtained by PVD method, METAL 2010, Ostrava, Czech Republic, p. 932-937, 2010.
[7]. A. Zhecheva ,W. Sha, S. Malinov, A. Long, Enhancing the microstructure and properties of titanium alloys through nitriding and other surface engineering methods, Surface and Coatings Technology, vol. 200, issue 7, p. 2192–2207, 2005.
[8]. K. L. Choy, Chemical vapour deposition of coatings, Progress in Materials Science, 48, p. 57–170, 2003.
[9]. E. Bemporad , M. Sebastiani, C. Pecchio , S. De Rossi, High thickness Ti/TiN multilayer thin coatings for wear resistant applications, Surface and Coatings Technology, vol. 201, issue 6, p. 2155-2165, 2006.
[10]. J. C. Caicedo, C. Amaya, L. Yate, O. Nos, M. E. Gomez, P. Prieto, Hard coating performance enhancement by using [Ti/TiN]n, [Zr/ZrN]n and [TiN/ZrN]n multilayer system, Mater. Sci. Eng. B, vol. 171, p. 56-61, 2010.
[11]. O. Yasuharu, K. Shinya, O. Kazuhide, A. Hideki, N. Hideki, H. Kenji, M. Osamu, Thin Solid Films, 497, 2006.
[12]. A. D. Krawitz- Introduction to Diffraction in Materials Science and Engineering, Wiley, New York, p. 165-167, 2001.
[13]. V. Sista, O. Kahvecioglu, O. L. Erylmaz, A. Erdemir, S. Timur. Thin Solid Films, 520, 1582, 2011.
