Wyniki wyszukiwania - BazTech

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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.

2

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.

3

The software interface for pre-selection of the user qualifications

Pawełczyk P., Para T., Potempa R.

Journal of Medical Informatics & Technologies

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2005

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Vol. 9

337--342

EN

The learning process by Internet needs various interfaces used for current knowledge analysis. The elaborated unit allows the user to make a simple check-up of his present qualifications. That is useful for indicating the adequate resources, the most suitable for his next learning process, within the Internet Distance Learning University. This interface can provide the user with a static information data and dynamic sequences of the e-content, as well.