Maroš Eckert

• Head of Department at Trencianska Univerzita Alexandra Dubceka V Trencine

Additive manufacturing of polymer composites, also known as 3D printing, is one of the progressive technologies in material engineering. It enables the production of parts with complex geometries while optimizing material efficiency. Polylactide (PLA) is a widely used material in additive manufacturing due to its biodegradability and suitable mecha...

This article presents a comprehensive analysis of polyamide 6 (PA6) and polyamide 12 (PA12) composites fabricated using additive manufacturing technologies such as Selective Laser Sintering (SLS) and Multi Jet Fusion (MJF). It focuses on the mechanical properties, preparation processes, and the influence of technological parameters on the final mat...

Epoxy composites play a crucial role in modern materials technologies, with their exceptional properties such as high strength and thermal and chemical resistance, making them ideal for a wide range of industrial applications, including aerospace, automotive, construction, and energy. This review article provides a comprehensive overview of the cur...

The aim of this paper is to present theoretical starting points in the field of risk analysis. This paper is formulated as a systematic overview of the latest knowledge and trends, which are supported by the simulation of selected risk parameters intended for the prediction of adverse events. The analysis and assessment of technical risk allow not...

In connection with the growing importance of the efficiency and reliability of tools in industrial sectors, our research represents a key step in the effort to optimize production processes and increase their service life in real conditions. The study deals with the comparison of the tribological properties of three tool steels, two of which were p...

In the original publication [...]

Experiments with changes in motion geometry can provide valuable data for engineering and development purposes, allowing a better understanding of the influence of tribological factors on the performance and service life of joints. The presented subject article focused on the experimental investigation of the influence of the geometry of the moveme...

The present review deals with the issues of ensuring and maintaining high reliability during the entire life cycle of a technical system in the engineering sector, i.e., determining the requirements, design, research, development, production, installation, operation, and disposal of the product. Owing to their reliability, special attention is give...

The presented work deals with the investigation of mechanical tribological properties on Inconel 625 superalloy, which is welded on a 16Mo3 steel pipe. The wall thickness of the basic steel pipe was 7 mm, while the average thickness of the welded layer was 3.5 mm. The coating was made by the cold metal transfer (CMT) method. A supercritical bending...

The paper deals with the dilatometric study of high-alloy martensitic tool steel with the designation M398 (BÖHLER), which is produced by the powder metallurgy process. These materials are used to produce screws for injection molding machines in the plastic industry. Increasing the life cycle of these screws leads to significant economic savings. T...

The article deals with phase transformations and austenitizing behavior of the 1.2343 tool steel. Dilatation analyses of a series of samples were performed at various cooling rates, chosen in the range from 10°C·s⁻¹ to 0.05°C·s⁻¹. Acquired experimental data were used for evaluation of dilatometric curves in order to map the temperature ranges of ph...

This paper deals with the possibilities of heat treatment of a pair of tool steels, produced by the powder metallurgy. The investigated steels named M390 and M398 belong to the group of high-alloy chromium steels used in the plastics industry in the production of screws for injection moulding machine unit. The steels were heat treated using quenchi...

Analysis of the high temperature plastic behaviour of 100MnCrW4 tool steel was developed in the temperature range of 800 – 1200°C and the deformation rate in the range of 0.001 – 10 s⁻¹ to the maximum value of the true strain 0.8. Microstructural changes were observed using light optical microscopy (LOM). The effect of hot deformation temperature o...

Structural steels can be used to produce barrels, due to their good properties. During the working cycle, steels are exposed to aggressive conditions such as thermal stress, fatigue, and wear. In this paper, two steels were selected, namely 30CrNiMo8 and 42CrMo4, which were abraded with a G40 ball bearing. All measurements were performed on a UMT T...

The application of DCSBD (Diffuse Coplanar Surface Barrier Discharge) plasma is referred to as the surface modification/activation of materials. The exposure of material surfaces to DCSBD plasma is initiated by changes in their chemical composition, surface wettability and roughness. The given study presents the mentioned plasma application in the...

The present work deals with the dilatometric study of a hot-rolled 0.2C3Mn1.5Si lean medium Mn steel, mainly suitable for the quenching and partitioning (Q&P) heat treatment in both hot-rolled or cold-rolled condition, subjected to a variation of austenitization temperature. These investigations were performed in a temperature range of 800–1200 °C....

The paper mainly focuses on calculating and comparing a mathematical model of the deformation behaviour at high temperatures. Analysis of the high-temperature plastic behaviour of lean medium-manganese steel 0.2C3Mn1.5Si was carried out in the temperature range of 900–1200◦ C and the deformation rate in the range of 0.01–10 s−1 to the maximum value...

This paper deals with the analysis and the possibility of using a constitutive model based on the Arrhenius equationfor tool steel 100MnCrW4. Experimental measurements were performed on a DIL 805 dilatometer in the range of strain rate 0.001 s-1 for 10 s -1 and temperature from 800 to 1200 °C. Using constitutive equations, material parameters and a...

The paper is focused on investigation of the high-strength AISI 4340 steel at various temperature and deformation conditions. The article is divided into two specific analyses. The first is to examine the dilatation behavior of the steel at eight different cooling rates, namely, 100, 10, 5, 1, 0.5, 0.1, 0.05 and 0.01 °C·s⁻¹. The mapping of the phas...

Tool steels are used in technological processes of forming and cutting and as cutting tools due to their good mechanical properties. During their working cycle, steels are exposed to several aggressive conditions, such as thermal stress, fatigue and various forms of wear. In this article, the selected 90MnCrV8 tool steel slid against the Si3N4 test...

Tool steels are used in technological processes of forming and cutting and as cutting tools due to their good mechanical properties. During their working cycle, steels are exposed to several aggressive conditions, such as thermal stress, fatigue and various forms of wear. In this article, the selected 90MnCrV8 tool steel slid against the Si3N4 test...

Tool steels are used in stamping, shearing processes, and as cutting tools due to their good mechanical properties. During their working cycle, steels are subject to aggressive conditions such as heat stress, fatigue, and wear. In this paper, three tool steels, namely X153CrMoV12, X37CrMoV5-1, and X45NiCrMo4 were selected against two types of beari...

Analysis of the high temperature plastic behavior of high-strength steel X153CrMoV12 was developed in the temperature range of 800–1200 °C and the deformation rate in the range of 0.001–10 s⁻¹ to the maximum value of the true strain 0.9%. Microstructural changes were observed using light optical microscopy (LOM) as well as atomic force microscopy (...

This paper deals with the effect of selected cutting parameter values in machining of OCHN3MFA steel on AFM and SEM microstructural analysis, cutting forces, nanohardness, 2D and 3D surface roughness, and material removal rate of surface layers after machining. OCHN3MFA steel was selected and used to perform experiments. Firstly, the selected steel...

The main topic of the research conducted by the authors of this article is the study of the mechanical properties of surface layers after finish machining by two methods. The material of the test samples is 33NiCrMoV steel. The main aim of the authors is to compare hardness of the machined surface layers of this steel after hard finish turning and...

Nanoindentation testing is a method that consists essentially of touching the material of interest whose local mechanical properties as are hardness and elastic modulus are unknown. Nanoindentation testing is simply an indentation test in which the length scale of the penetration is measured in nanometres (10⁻⁹ m) rather than microns (10⁻⁶ m) or mi...

At present, in a period of an industrial expansion great emphasis is placed on the environment. That means aiming for a reduced energy consumption, and also lessening dustiness from very fine powder material. This category also includes particulate material agglomeration processes. Because this process is very energy-intensive, it is necessary to c...

There are different criteria for assessing the appropriateness of an agglomeration technology in the deployment processing of dry, fine and dirty dust burdening in the communal and working environment. Besides the benefit of the environment components, the agglomeration technology offers the possibility of re-processing the material as the primary...

This paper focuses on the characterization of the tabletting process and analysis one of the most common pharmaceutical excipients MCC Avicel PH102 by Heckel, Kawakita, Cooper-Eaton and Adams compaction equations. Experimental material was determined by measuring its parameters as particle size distribution, angle of wall friction and flow properti...

Calcium carbonate in the form of finely ground limestone is a material that has found its application in a wide range of industries, in the chemical, rubber, agricultural, and paper industries, is used for desulfurization of boilers and other. In civil engineering, ground limestone is used for the production of building materials, plaster and morta...

Compaction of powdered materials into a solid body is one of the most used processes for the processing of such materials in a wide range of industries. Tabletting of powdery substances and drugs into a tablet form has the largest representation in the pharmaceutical industry. This process takes place in tablet presses which have to be able to prod...

The paper is focused on an analysis of the most frequently used compaction equations for powdered materials such as Heckel equation, Kawakita equation and Cooper-Eaton equation. Compacting powdered materials is accompanied by various mechanisms of densification dependent on the properties of the compressed material, which makes the equation more sa...

One of the most commonly used processes in the pharmaceutical industry is the production of tablets by die compaction. Control of the compression process through operating parameters is necessary to obtain the desired properties of the tablets. This article deals with the investigation of the chosen parameters of powder compaction used in the pharm...

Nowadays tabletting of powders in the pharmaceutical industry is, among other agglomeration processes, most widely used method of finalizing solid products. From a procedural point of view, stress fields of the tablet have the dominant importance because they directly determine its quality. This paper focuses on the experimental detection of the pr...