Journal of Casting & Materials Engineering
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ISSN 2543-9901
Issue Date
2023
Volume
Vol. 7
Number
No. 1
Description
Journal Volume
Journal of Casting & Materials Engineering
Vol. 7 (2023)
Projects
Pages
Articles
Effect of particle size of a powder upon the properties and microstructure of boron-modified Fe-Ni-Mo-Cu sinters
(AGH University Press, 2023) Karwan-Baczewska, Joanna; Perek-Nowak, Małgorzata; Majchrowska, Magdalena; Rosso, Mario
The article discusses the effect of different particle fractions of prealloyed iron powder on the microstructure, density and hardness of sintered material. Each particle fraction (apart from 160-200 μm, which is a trace fraction) was modified with boron, its contents being, respectively, 0.2 wt.%, 0.4 wt.% and 0.6 wt.%. Next, the powder mixtures were pressed under a pressure of 600 MPa, and the final compacts were subject to sintering at 1200°C for 60 min in a hydrogen atmosphere. It was observed that the higher values of density and hardness were found in samples made from finer fractions of powder. A higher homogeneity of the microstructure and the highest degree of compactness was obtained in sinters from powder of 40-56 μm particle size, with 0.4 wt.% B. Due to the use of small particle fractions of prealloyed powder, a higher degree of compactness in sinters was obtained with lower boron content. Also indicated was which particle fraction of Fe-Ni-Mo-Cu powder should be applied to obtain density in sinters with boron addition equal to almost 100% of the relative density of the analyzed alloy. The presented studies have both scientific and technological aspects.
Research on new Al-Ag-Mo alloys dedicated to wire applications in overhead power lines
(AGH University Press, 2023) Grzebinoga, Justyna; Mamala, Andrzej; Ściężor, Wojciech; Kowal, Radosław
The latest research work in the field of electric power systems focuses on the development of new wire materials which will allow the increase of the transmission capacity of power lines currently in use. The reason for this research was the often limited possibilities of continuous and failure-free transmission of electricity. In this paper, the authors present research on a new aluminium-based alloy dedicated for use as a conductive braid in the HTLS cable group. There are many technical solutions for this group of cables on the market, although they are solutions with a number of disadvantages, ranging from their high price, various operational shortcomings, complicated installation techniques, and ending with the risk of monopolistic practices, which is related to the inability to attract several competitive suppliers. The main aim of the research was to develop a new alloy based on aluminium with the addition of silver and molybdenum dedicated for use in special overhead power cables. Experimental research on new materials focused on obtaining the necessary knowledge to produce an overhead wire from these alloys with higher current carrying capacity in relation to the currently used conventional wire materials based on aluminium.