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Tribological study of low friction DLC:Ti and MoS2 thin films

Paradecka A., Lukaszkowicz K.

Journal of Achievements in Materials and Manufacturing Engineering

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2018

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Vol. 89, nr 1

13--18

EN

Purpose: The purpose of this article is to characterize and compare the microstructure and tribological properties of low friction DLC:Ti and MoS2 thin films deposited on the austenitic steel X6CrNiMoTi17-12-2 substrate. Design/methodology/approach: In the research, the samples of the DLC:Ti and MoS2 thin films deposited by PACVD technology and magnetron sputtering method respectively were used. Observations of topography were made using atomic force microscope (AFM). Adhesion of the coating to the substrate material was verified by the scratch test. The friction coefficient and wear rate of the coating were determined in the ball-on-disc test. Findings: AFM as well as adhesion and friction coefficient tests confirmed low friction nature of MoS2 and DLC:Ti coatings. During the research information on the behaviour of coatings under tribological load was obtained. The investigated coating reveals high wear resistance and good adhesion to the substrate. Practical implications: The area of testing of low-friction thin films is widely studied due to their practical application. Intensive development of new technologies requires the introduction of corresponding layers of both full protective functions and reducing friction. Originality/value: Growing area of low-friction coatings with specific properties requires thorough tribological and topographical research, which is closely related to these properties.

2

Comparison of the structure and topography of selected low friction thin films

Paradecka A., Lukaszkowicz K., Kříž A., Potempa R.

Journal of Achievements in Materials and Manufacturing Engineering

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2017

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Vol. 83, nr 1

21--25

EN

Purpose: The purpose of this article is to characterize and compare the structure, mechanical and tribological properties of low friction DLC and TiC thin films deposited on the austenitic steel X6CrNiMoTi17-12-2 substrate. Design/methodology/approach: In the research, the samples of the DLC and TiC thin films with transition hard AlCrN interlayer deposited by magnetron sputtering and PACVD technology respectively were used. Observations of topography were made using a scanning electron microscope (SEM), and the atomic force microscope (AFM). The structure of samples was performed using a Raman microscope. The microhardness tests of thin films were made by Oliver & Phare method. Findings: Studies confirmed that the combination of research SEM and AFM provide crucial information on the structure and topography of the samples. It was possible to obtain information about the topography parameters and allow for the assessment of morphology and quality of the tested coatings. Study of the structure using Raman spectroscopy revealed the band corresponding to the DLC and TiC thin films. Practical implications: The current application areas for low friction thin films are constantly growing, and the intensive development of techniques requires the use of new technologies what leads to the production of the specific surface layer and a thorough examination. Originality/value: Growing area of low friction coatings with specific properties requires the use of specialized tools aimed at assessing the topography and structures which are responsible for tribological properties.

3

Characteristics of TiCN coating deposited by cathodic arc evaporation

Lukaszkowicz K., Paradecka A., Kwaśny W., Potempa R.

Journal of Achievements in Materials and Manufacturing Engineering

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2017

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Vol. 84, nr 1

23--31

EN

Purpose: In this paper, we report the research results on the structure and mechanical and tribological properties of TiCN coating deposited by cathodic arc evaporation process on the X40CrMoV5-1 steel substrate. Design/methodology/approach: The morphology of the surface of the investigated coating was performed using a scanning electron microscope Zeiss Supra 35. Diffraction and thin film structure were tested with the use of the transmission electron microscopy. The cohesion and adhesion properties of the coating were made using the scratch test on the CSEM REVETEST device. The friction coefficient and wear rate of coating were determined in the ball-on-disc test. The whole study was complemented by X-ray crystallography. Findings: The TiCN coating demonstrated columnar structure as well as good adherence to the substrate - the critical load LC2 is 63 N. It was found that the structure of the investigated coating consisted of fine crystallites. Basing on the XRD pattern of the TiCN, the occurrence of fcc phase was observed in the coating, the texture direction <111> is perpendicular to the sample surface. In sliding dry friction conditions, the friction coefficient for the investigated element is set in the range between 0.32-0.37. The coatings demonstrated a high hardness (3000 HV). Practical implications: In order to evaluate with more detail the possibility of applying these surface layers in tools, further investigations should be concentrated on the determination of the thermal fatigue resistance of the coatings. The very good mechanical properties of the TiCN coatings make them suitable in industrial applications. Originality/value: The investigation results will provide useful information to applying the TiCN coatings for the improvement of mechanical properties of the hot work tool steels.

4

Structure and properties of CrN/DLC coating deposited by PVD ARC-cathodes and PACVD technology

Lukaszkowicz K., Paradecka A., Wiśniewska J.

Archives of Materials Science and Engineering

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2013

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Vol. 64, nr 1

40--44

EN

Purpose: The main aim of the this research was the investigation of the microstructure and the mechanical properties of the CrN/DLC coating deposited by hybrid PVD/PACVD process onto the X40CrMoV5-1 hot work tool steel substrate. Design/methodology/approach: The microstructure of the investigated coating was observed on the scanning electron microscopy and transmission electron microscopy. Tests of the coatings’ adhesion to the substrate material were made using the scratch test. A friction coefficient and the wear of coatings were determined in a test according to the ball-on-disk method. Findings: It was found that the microstructure of the CrN layer consisted of fine crystallites, while their average size fitted about 10 nm. The low-friction DLC show an amorphous character. The coating demonstrated a satisfactory adhesion to the substrate. The values of the critical load LC1 and LC2 of investigation coating account for, respectively, 9 and 39 N. In sliding dry friction conditions, after the break-in time, the friction coefficient for the investigated elements is set in the range between 0.03-0.06. The investigated coatings reveals high wear resistance. Practical implications: Economically efficient process improvement, increased production efficiency and quality and products reliability through increased durability and unfailing operation time of tools for plastic formation of non-ferrous metals and improved usable properties shall guarantee measurable economic effects to the manufacturers and users of the products. Moreover, it will enhance their competitiveness both on the domestic and overseas markets. Originality/value: The Author’s original approach was the development of a double-layer coating within one process. Such coating consists of the internal hard PVD layer providing the appropriate hardness, strength, low thermal conductivity and restricting the impact of external factors on the wear process and the external low-friction layer providing good tribological properties.