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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

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2006

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Vol. 14, nr 1-2

59--63

EN

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.

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Adhezja bakterii na modyfikowanych powierzchniach protetycznego stopu Co-Cr-Mo. Badania wstępne

Klimek L.

Inżynieria Powierzchni

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2006

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nr 4

64-68

PL

W pracy przedstawiono badania mające na celu określenie stopnia adhezji bakterii do modyfikowanych powierzchni stomatologicznego stopu protetycznego Co - Cr - Mo. Badania wykonano na stopie WIRONI'I', którego powierzchnię pokryto następującymi powłokami: azotek tytanu TiN oraz węgloazotek tytanu Ti(CN). Ten ostatni w dwóch wariantach składu - 4% wag. C i 15% wag. C. Próbki zostały umieszczone na 24 godziny w pożywce bakteryjnej, a następnie poddane obserwacjom w elektronowym mikroskopie skaningowym, gdzie określano liczbę bakterii obecnych na powierzchniach badanych próbek. Otrzymane wyniki wykazały, że najmniej bakterii kolonizowało powierzchnie pokryte azotkiem tytanu, a najwięcej próbkę kontrolną - stop bez pokrycia. Warstwy węgloazotków tytanu wykazywały pośredni stopień kolonizacji bakteriami, przy czym dało się zauważyć, że im warstwa bogatsza w węgiel, tym obserwuje się więcej bakterii na powierzchni.

EN

The investigations leading to define the degree of bacteria adhesion to modified surfaces of prosthodontic alloy Co-Cr-Mo were presented in the paper. The study was made on the WIRONIT alloy, the surface of which was covered with titanium nitride TiN and titanium nitrocarbide Ti(CN) coatings. The latter was applied in two composition variations - 15% by weight and 4% of weight. The samples were placed for 24 hours in bacterial medium and then observed under a scanning electron microscope, where the number of bacteria present on samples surface were determined. The obtained results showed, that the smallest number of bacteria colonised surfaces covered with titanium nitride and the greatest number of bacteria were observed on the control sample i.e. the alloy without any covering layer. The titanium nitrocarbide layers showed the medium colonisation degree by bacteria. Moreover, it was visible, that the more carbon in the layer, the more bacteria on the surface were present.

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Płytki krwi w kontakcie ze stopem tytanu Ti6Al4V i z jego zmodyfikowanymi powierzchniami

Okrój W., Klimek L., Komorowski P., Walkowiak B.

Inżynieria Biomateriałów

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2005

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R. 8, nr 43-44

13-16