The Tribological Behavior of TiN/TiC CVD Coatings under Dry Sliding Conditions against Zirconia and Steel Counterparts

Jakab, Miklós; Ali, Osamah Ihsan; Gyurika, István Gábor; Korim, Tamás; Telegdi, J.

doi:10.3390/coatings13050832

Cited by 2 publications

(1 citation statement)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The purposes of the multi-objective optimization procedure created with numerical methods were to minimize the maximum contact pressure of the teeth, the transmission error, and the average temperature of the gears in their contact zone, and to maximize the mechanical efficiency in the case of hypoid gear drives [67]. The wear resistance and service life of cutting tools are also affected by the tribological behavior of the different coatings produced with different production parameters [68]. The design and construction of most mechanisms require a unique approach due to various considerations, which represents a constant challenge for today's engineers.…”

Section: Discussionmentioning

confidence: 99%

Challenges of Engineering Applications of Descriptive Geometry

Balajti

2023

Symmetry

View full text Add to dashboard Cite

Descriptive geometry has indispensable applications in many engineering activities. A summary of these is provided in the first chapter of this paper, preceded by a brief introduction into the methods of representation and mathematical recognition related to our research area, such as projection perpendicular to a single plane, projection images created by perpendicular projection onto two mutually perpendicular image planes, but placed on one plane, including the research of curves and movements, visual representation and perception relying on a mathematical approach, and studies on toothed driving pairs and tool geometry in order to place the development presented here among them. As a result of the continuous variability of the technological environment according to various optimization aspects, the engineering activities must also be continuously adapted to the changes, for which an appropriate approach and formulation are required from the practitioners of descriptive geometry, and can even lead to improvement in the field of descriptive geometry. The imaging procedures are always based on the methods and theorems of descriptive geometry. Our aim was to examine the spatial variation in the wear of the tool edge and the machining of the components of toothed drive pairs using two cameras. Resolving contradictions in spatial geometry reconstruction research is a constant challenge, to which a possible answer in many cases is the searching for the right projection direction, and positioning cameras appropriately. A special method of enumerating the possible infinite viewpoints for the reconstruction of tool surface edge curves is presented in the second part of this paper. In the case of the monitoring the shape geometry, taking into account the interchangeability of the projection directions, i.e., the property of symmetry, all images made from two perpendicular directions were taken into account. The procedure for determining the correct directions in a mathematically exact way is also presented through examples. A new criterion was formulated for the tested tooth edge of the hob to take into account the shading of the tooth next to it. The analysis and some of the results of the Monge mapping, suitable for the solution of a mechanical engineering task to be solved in a specific technical environment, namely defining the conditions for camera placements that ensure reconstructibility are also presented. Taking physical shadowing into account, conclusions can be drawn about the degree of distortion of the machined surface from the spatial deformation of the edge curve of the tool reconstructed with correctly positioned cameras.

show abstract

Section: Discussionmentioning

confidence: 99%

Challenges of Engineering Applications of Descriptive Geometry

Balajti

2023

Symmetry

View full text Add to dashboard Cite

show abstract

A novel approach to investigate oxidation behaviour and mechanical properties of CVD bilayer TiN/TiC coatings

Ali,

Gyurika,

Korim

et al. 2024

PAC

View full text Add to dashboard Cite

A novel approach to investigate the oxidation behaviour of bilayer TiN/TiC coatings deposited on WC-Co substrate by CVD method was employed. Two coatings with different structures and mechanical properties were manufactured using different processing parameters. Energy dispersive X-ray analysis was utilized to monitor the elemental composition during oxidation tests at 800 ?C for up to 40min, which simulated the high temperature conditions experienced by the coated cutting tools. The obtained results demonstrated that the oxygen content increased significantly, reached ~68.8 at.%, while carbon and nitrogen contents decreased due to the formation of gaseous by-products. X-ray diffraction confirmed complete transformation of the TiN layer into rutile-TiO2 after 20min of oxidation. The microhardness of the coated samples significantly decreased due to the oxide formation and development of pores and cracks during the oxidation process. Tribological tests revealed a significant increase in the volume loss during dry sliding against zirconia counterpart after 20min of oxidation time. Moreover, surface colour of the oxidized coated samples changed from silver-white to grey-black with oxidation progression, enabling visual evaluation of oxidation damage.

show abstract

The Tribological Behavior of TiN/TiC CVD Coatings under Dry Sliding Conditions against Zirconia and Steel Counterparts

Cited by 2 publications

References 41 publications

Challenges of Engineering Applications of Descriptive Geometry

Challenges of Engineering Applications of Descriptive Geometry

A novel approach to investigate oxidation behaviour and mechanical properties of CVD bilayer TiN/TiC coatings

Contact Info

Product

Resources

About