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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2006

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Microhardness study of Ti(C, N) films deposited on S-316 by the Hallow Cathode Discharge Gun

Novinrooz A. J., Seyedi H., Larijani M. M.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 14, nr 1-2

59--63

Purpose: The micro hardness properties of Titanium Carbonitride composite coated on SS-316 substrates were studied to achieve a desired harden surfaces. Design/methodology/approach: Hollow Cathode Discharge gun (HCD–gun) was employed for deposition of the Ti(C, N) on SS-316. The evaporated and ionized metal (Ti) was coated as an under layer with 0.5 ampere beam current and 100 volt bias voltage. The reactant nitrogen and methane gasses were fed through inlet in to the chamber containing Ti element to form Ti (C, N) matrix with an optimized ratio. Findings: In this work, Glow Discharge Optical emission Spectroscopy (GDOS) used for composition alanalysis of the content elements. On the bases of this operation it was revealed the existence of Ti, C, N elements, X-ray diffraction (XRD) technique was utilized to investigate films crystalline structure. The investigation showed that samples with different stoichiometry have a fcc structure with (111) plan of reflection. The atomic ratio of carbon and nitrogen were measured using energy dispersive X-ray (EDX) analysis. The optimized value was funned to be TiC0.87 N0.13. The atomic force microscopy (AFM) and scanning electronmicroscopy (SEM) were employed to study the films microstructure. A hardness of 3250 HV was obtained in the carbon content C/C+ N atomic ratio of 9 to 1 using a Vickers microhardness tester. Research limitations/implications: As the study was carried out on a limited surfaces, we shall endeavor further attempt on large area deposition. Practical implications: The tools coated in titanium accompanied by nitride and carbide has shown significant improvement. Good compatibility of Ti (C, N) compound makes these composite suitable in various technical and industrial applications. Originality/value: It may be remarked that, the hardness obtained in this work is very encouraging and therefore, it is convenient to regard this as a privileged step taken in tool manufacturing aspect.