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Microstructure and Mechanical Properties of Amorphous Hydrogenated DLC-Coated Ti-6Al-4V ELI Alloy with TiCN Interlayer Prepared by rf-PECVD

Lee Kwangmin, Kang Seokil

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 4

1357--1360

EN

The low adherence of diamond-like carbon (DLC) films on titanium (Ti) alloys can be improved by using interlayer coatings. In this study, DLC (a-C:H) films were deposited using radio-frequency plasma-enhanced chemical vapor deposition (rf-PECVD), and a TiCN interlayer was applied between the extra low interstitial (ELI) grade of Ti-6Al-4V alloy and a-C:H film. The characteristics of the a-C:H-coated Ti-6Al-4V ELI alloy were investigated using field emission scanning electron microscopy, Vickers hardness, and scratch and wear tests. The DLC (a-C:H) films deposited by rf-PECVD had a thickness of 1.7 μm, and the TiCN interlayer hada thickness of 1.1 μm. Vickers hardness of the DLC (a-C:H) films were increased as a result of the influence of the TiCN interlayer. The resulting friction coefficient of the a-C:H-coated Ti-6Al-4V with the TiCN interlayer had an extremely low value of 0.07.

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Morfologia powłok TiCN nanoszonych techniką fizycznego osadzania z fazy gazowej (PVD)

Madej M., Ozimina D., Kowalczyk J., Pawelec K.

Obróbka Metalu

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2017

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nr 3

18--21

EN

In this paper the results of researches of coatings TiCN morphology were presented. Tested coating were deposited by PVD technique on tool steel HS6-5-2C surface. Coating thickness were measured by means of compact device Calotest CATs and optical microscope. Coating structure and its chemical analysis were made with the aid of electron microscope JSM 7100F with analyzer EDS. Hardness of coating were measured with the aid of hardness tester INNOVATEST. On the base of investigations results it was found that morphology features of tested coating fulfil potential requirements, e.g. on cutting tool edges or on machine elements worked in rugged conditions (great load, high temperature).

PL

W artykule przedstawiono wyniki badań dotyczących morfologii powłok węglikoazotku tytanu TiCN uzyskanych w procesie fizycznego osadzania z fazy gazowej PVD na stali narzędziowej HS6-5-2C. Pomiaru grubości powłoki dokonano przy użyciu kompaktowego urządzenia Calotest CATc oraz mikroskopu optycznego. Obserwacje struktury i analizę składu chemicznego wykonano skaningowym mikroskopem elektronowym JSM 7100F wyposażonym w analizator EDS. Twardość zmierzono twardościomierzem INNOVATEST. Na podstawie rezultatów badań stwierdzono, że cechy morfologiczne badanych powłok spełniają potrzeby wynikające z ich potencjalnych zastosowań, a więc na ostrzach narzędzi skrawających i na elementach pracujących w trudnych warunkach (duże obciążenie, wysoka temperatura).

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Influence of the chemical composition and particle size of the metal matrix, on TiCN-reinforced Fe-based composites

Gómez B., Gordo E., Ruiz-Navas E. M., Torralba J. M.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

57-60

EN

Purpose: The objective of this work is to study the influence of different parameters as the chemical composition and particle size of the metal matrix, on TiCN-reinforced Fe-based composites. Design/methodology/approach: In order to obtain the composite powder two different types of blending were used, conventional blending and high energy milling (HEM). The HEM was carried out in a planetary ball mill during 12 hours, with a rotating speed of 400 rpm, and a ratio ball:powder of 10:1 (in mass). The atmosphere was Argon to prevent the oxidation. After the preparation of powders, compacts were produced by uniaxial pressing at 700 MPa and sintering under vacuum. The sintering temperatures varied between 1350oC and 1450oC, for 60 min. Sintered samples were characterised by determination of density, dimensional change, Vickers hardness (HV30), bending strength, and C, N contents (by LECO). The microstructural study was carried out by scanning electron microscopy (SEM). Findings: As a result of the study it is clear that the presence of carbides in the metal matrix allows the increasing of mechanical properties of sintered composites, and these properties are related with the microstructure and C/N ratio. Practical implications: In this research 50 % vol of hard phase is introduced, following a simpler and lowercost route, as pressing and sintering. It is true that high-energy milling raises the cost of the processing. This is why conventional blending of small size powder particle has also been done in this work. The latter route has shown to give quite promising results, reaching hardness values about 2000 HV30. Originality/value: In this work, composite materials with high hardness have been obtained following a simple and low-cost route.

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New trends in coating: Room temperature deposition of titanium-based films

Lackner J.M., Waldhauser W., Berghauser R., Ebner R., Major B., Fian A., Jakopic G.

Inżynieria Materiałowa

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2004

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R. XXV, nr 3

611-615

EN

Titanium-based compounds are widely spread coating materials for mechanical, tribological, electrical, optical, catalytic, sensoric, micro-electronical applications due to their exceptionally physical and chemical properties. Recently, the trend of using temperature-sensitive materials like polymers and also tool steels of the highest hardnesses demands new low-temperature coating techniques for protective surface finishing as well as for functionalization of the surfaces. Titanium-based compounds can fulfill a wide range of these demands, but up to now there is a lack of industrially designed vacuum coating techniques operating at the temperatures lower than 50 °C necessary for these applications. The Pulsed Laser Deposition (PLD) process is known as one of the most promising candidates for the such problems. But up to now PLD is a well-established laboratory coating technology and has not become a standard industrial coating technique despite its outstanding process features. The missing of PLD coating systems, which fulfil the requirements for industrial applications like high-rate deposition and adequate sizes of deposition chambers is considered as one of the main obstacles for a breakthrough of the PLD technique. To overcome this problem an industrially designed PLD coating system has been developed and built at the Laser Center Leoben of JOANNEUM RESEARCH Forschungsgesellschaft mbH. The current paper summarizes results of structural, mechanical, tribological, optical and electrical investigations of the presently most important Ti-based coatings metallic titanium, titanium nitride (TiN), titanium oxide (TiO2) and titanium carbonitride (TiCN).