1:30pm - 1:50pmCombustion synthesis of silicon carbide by magnesio-carbothermic reduction of amorphous and crystalline silica
Hasmik Kirakosyan1, Khachik Nazaretyan1, Hayk Beglaryan2, Roman Ivanov3, Irina Hussainova3, Sofiya Aydinyan1,3
1Laboratory of Macrokinetics of Solid State Reactions, A.B. Nalbandyan Institute of Chemical Physics NAS RA, P. Sevak 5/2 Yerevan, 0014, Armenia; 2Laboratory of the Synthesis of Materials Having Practical Importance from Ultrabasic Rocks and Their Investigation, M.G. Manvelyan Institute of General and Inorganic Chemistry NAS RA, H.Arghutyan 10, Yerevan, 0051, Armenia; 3Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate 5, Tallinn, 19086, Estonia
1:50pm - 2:10pmEffect of carbon content on the microstructure and phases of (TiVNbCrMo)C5 high entropy carbide
Furqan Anwar1, Marek Tarraste1, Lutz-Michael Berger2, Johannes Pötschke2
1Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate Tee 5, Tallinn, 19086, Estonia; 2Fraunhofer IKTS, Winterbergstr. 28, D-01277 Dresden, Germany
2:10pm - 2:30pmSynthesis of novel high entropy MAX (M= Ti, Cr, Mn, Co, Ni) phase via combustion mode
Alina Zurnachyan1, Abraham Ginosyan2, Irina Hussainova3, Suren Kharatyan1, Sofiya Aydinyan1,3
1A.B. Nalbandyan Institute of Chemical Physics, NAS RA, Armenia; 2Yerevan State University, 1 Alek Manukyan St, 0025, Yerevan, Armenia; 3Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
High-entropy materials (HEM) are an innovative group of solid-solution materials composed of multiple elements in equimolar ratios (or non-equimolar ratios), with each element’s content ranging from 5 at.% to 35 at.% [1]. The possibility of chemical exfoliation of layered bulk structures has brought great hope to synthesis novel 2D materials with unique electronic and mechanical properties in the future [2].
The aim of this work is to study the possibility of the combustion synthesis of new HEM in the Ti-Cr-Mn-Co-Ni-Al-C system. A novel high entropy alloy (HEA) and 211-type MAX phases were developed and synthesized in the Ti-Cr-Mn-Co-Ni-Al-C system depending on the titanium and carbon content.
The final products obtained by SHS were examined using the X-ray diffractometer (XRD MiniFlex 600) and Scanning electron microscope (Prisma E). In the XRD patterns of the final product, a characteristic peak of MAX phase type 211 was found out at 2 theta (degree) 13.74. The product also contained HEA. SEM analysis confirmed the existence of two different microstructuress - layered structures and porous sheets, simultaneously. The synthesized and characterized powders are adapted and will be tested for future catalytic applications.
This work was supported by the Committee of Science of the Republic of Armenia (grant number 23LCG-2F001).
References
[1] Donglong Bai, Qiang Wang, et al, J. Mat. Scien. & Techn. 209, 1–8 (2025)
[2] K. Wang, H. Du, Z. Wang, et al, Int. J. Hydr. Ener. 42, 4244-4251(2017).
2:30pm - 2:50pmImpact of High Chromium Content Additions on the Microstructure and Mechanical Properties of Iron-Bonded Ti(C,N) Cermets
Tabeen Halawat Pampori, Märt Kolnes, Kristjan Juhani, Marek Tarraste, Jakob Kubarsepp
Tallinn University of Technology (TalTech), Estonia
2:50pm - 3:10pmExploring Self-Propagating High-Temperature Synthesis for the Fabrication of MAX Phases
Syuzanna Melkonyan1,2, Marieta Zakaryan1, Yeva Grigoryan1, Suren Kharatyan1, Irina Hussainova3, Sofiya Aydinyan1,3
1Laboratory of Macrokinetics of Solid State Reactions, Institute of Chemical Physics NAS of Armenia, Yerevan 0014, Armenia; 2Faculty of Chemistry, Yerevan State University, 1 Alex Manoogian, 0025, Yerevan, Armenia; 3Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate 5, 19086 Tallinn, Estonia
3:10pm - 3:30pmAssessing the Longevity of Agricultural Knife Coulters and Reinforced Plough Points: A Field and Simulation Approach
Justas Listauskas1, Vytenis Jankauskas1, Audrius Žunda1, Egidijus Katinas2
1Vytautas Magnus University, Lithuania; 2Czech University of Life Sciences Prague
This research examines the wear resistance of plough points and knife coulters from different manufacturers, using both field and laboratory methods to compare the durability of reinforced and non-reinforced parts. The primary focus is on understanding the impact of material composition, microstructural properties, and the application of carbide plates on wear characteristics. ASTM G65 tests and Discrete Element Method (DEM) simulations reveal key insights into wear characteristics, stress distribution and durability for tillage working parts.
Reinforced points wore 2.5 times less by mass and experienced 4.53 times less diagonal length shortening. The study also found that carbide-reinforced points experienced 10.2 times less diagonal shortening than non-reinforced points when no stone damage occurred.
Further microstructural analysis revealed that plough points with a martensitic-bainitic microstructure and higher boron and carbon content had superior wear resistance, while less durable plough points showed more significant wear due to lower carbon content (0.1768%) and reduced hardness.
DEM simulations, conducted using Ansys Rocky software, allowed for accurate predictions of soil-particle interactions and stress distributions. The simulation results aligned with field data, identifying the highest stress at the front edge of the plough point, where soil pressure reached up to 1.0 MPa (Fig. 1 b), confirming this area’s susceptibility to intense wear.
These findings highlight the advantages of carbide reinforcement and optimized microstructure in reducing wear, especially in abrasive soils. Manufacturers can extend plough lifespan by improving steel composition and applying heat treatments to enhance martensitic and bainitic microstructure properties, ultimately reducing maintenance needs and costs for end users.
3:30pm - 3:50pmNon-destructive testing complemented by numerical method using Matlab for analysing surface and internal defects
Tomas Kačinskas, Saulius Baskutis
Kaunas University of Technology, Lithuania
This study introduces a MATLAB-based automated system for the detection and measurement of defect areas in coated surfaces, enhancing the accuracy and efficiency of quality control processes in metal, polymeric and thermoplastic coatings. Utilizing ISO standards for defect evaluation, the code identifies various defect characteristics, quantifying their size and location while adhering to stringent criteria regarding indications. A comprehensive testing method involving penetrant testing and radiographic examination allowed for an in-depth analysis of surface and internal porosity across different coating methods, including chrome, aluminium, copper, polytetrafluoroethylene, polyether ether ketone based materials . Initial findings helps indicate a critical discontinuities of obtained coatings manufactured using different technologies and materials. Each sample image is individually loaded into MATLAB and analysed using the Image Processing Tool, Computer Vision Toolbox, and Statistics and Machine Learning Toolbox. The customized code performs essential tasks such as image conversion, filtering, boundary detection, layering operations, and calculations. These processes are integral to rendering images with marked indicators of defects, providing a detailed visual representation of the analysis. Non-destructive radiographic testing confirmed previous observations, revealing no additional hidden defects in the coatings or opposite then internal porosity are common issue. Matrix and graphical representations were utilized to facilitate the comparison of test results, emphasizing the modern methods and materials as the superior choice for achieving optimal mechanical and structural integrity. This work represents a substantial advancement in the assessment and optimization of non-destructive testing and numerical method complementation, providing critical insights for future research and applications in material engineering.
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