Wyniki wyszukiwania - BazTech

1

Increasing the operational reliability of a ship by using a composite impeller in the event of hydrophore pump failure

Jabłońska Monika, Jurczak Wojciech, Ozimina Dariusz, Adamiak Marcin

Eksploatacja i Niezawodność

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2023

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Vol. 25, no. 1

art. no. 18

EN

The time-consuming technological process of manufacturing impellers and the high production costs are the reason for the search for alternative materials and manufacturing methods. In this paper, based on a literature analysis, the performance of a pump with an impeller that was manufactured by an incremental method from polyethylene terephthalate with an admixture of glycol and carbon fibre (PETG CF) was selected and studied. Operation tests were conducted on the ship’s rotodynamic pump test bench. The composite impeller pump was shown to have an efficiency at the selected printing parameters of 26,23%, comparable to a tin bronze impeller, which has an efficiency of 27,7%. The maximum pump useful power with the impellers tested was 337 W at a flow rate of 4.42 m3/h. The results confirm that, with a filament layer height of 0.12 mm and 100% fill in the four print contours, the pump characteristics obtained are consistent with those of the reference impeller. This fact ensures continuous operation of the ship’s pump for 48 hours which makes the chosen manufacturing method a reliable emergency method of impeller repair in offshore operations.

2

Hardfacing of mild steel with wear-resistant Ni-based powders containing WC particles using PPTAW technology

Appiah Augustine, Bialas Oktawian, Jędrzejczyk Marcelina, Ciemała Natalia, Wantuch Łucja, Żuk Marcin, Czupryński Artur, Adamiak Marcin

Welding Technology Review

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2022

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R. 94

3--18

EN

This study explores the use of powder plasma transferred arc welding (PPTAW) as a surface layers deposition technology to form hardfaced coatings to improve upon the wear resistance of mild steel. Hardfaced layers/coatings were prepared using the PPTAW process with two different wear-resistant powders: PG 6503 (NiSiB+60% WC) and PE 8214 (NiCrSiB+45% WC). By varying the PPTAW process parameters of plasma gas flow rate (PGFR) and plasma arc current, hardfaced layers were prepared. Microscopic examinations were carried out to investigate the microstructure and surface characteristics of the prepared hardfaced layers. Penetration tests were performed to ascertain the number and depth of crack sites in the prepared samples by visual inspection. The hardness of the hardfaced layers were determined: hardfacings prepared with PG 6503 had hardness of 46.3 - 48.3 HRC, those prepared with PE 8214 had hardness of 52.7 - 58.3 HRC. The microhardness of the matrix material was in the range of 573.3 - 893.0 HV, and the carbides had microhardness in the range of 2128.7 - 2436.3 HV. Abrasive wear resistance tests were carried out on each prepared sample to determine their relative abrasive wear resistance relative to the reference material, abrasion resistant heat-treated steel, Hardox 400, having a nominal hardness of approximately 400 HV. Findings from the research showed that the wear resistance of the mild steel was improved after deposition of hardfaced layers; the hardness and wear resistance were increased upon addition of Cr as an alloying element; increasing the PGFR increased the hardness and wear resistance of the hardfacings, as well as increase in the number of cracks; increasing the PTA current resulted in hardfacings with less cracks, but relatively lowered the wear resistance. The wear mechanisms were discussed.

3

Hardfacing of mild steel with wear-resistant Ni-based powders containing tungsten carbide particles using powder plasma transferred arc welding technology

Appiah Augustine Nana Sekyi, Bialas Oktawian, Żuk Marcin, Czupryński Artur, Konadu Sasu David, Adamiak Marcin

Materials Science Poland

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2022

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Vol. 40, No. 3

42--63

EN

This study explores the use of powder plasma transferred arc welding (PPTAW) as a surface layer deposition technology to form hardfaced coatings to improve upon the wear resistance of mild steel. Hardfaced layers were prepared using the PPTAW process with two different wear-resistant powders: PG 6503 (NiSiB + 60% WC) and PE 8214 (NiCrSiB + 45% WC). By varying the PPTAW process parameters of plasma gas flow rate (PGFR) and plasma arc current, hardfaced layers were prepared. Microscopic examinations, penetration tests, hardness tests, and abrasive wear resistance tests were carried out on the prepared samples. Hardfacings prepared with PG 6503 had a hardness of 46.3–48.3 HRC, while those prepared with PE 8214 had a hardness of 52.7–58.3 HRC. The microhardness of the matrix material was in the range of 573.3–893.0 HV, while that of the carbides was in the range of 2128.7–2436.3 HV. The abrasive wear resistance of the mild steel was improved after deposition of hardfaced layers by up to 5.7 times that of abrasion-resistant heat-treated steel, Hardox 400, having a nominal hardness of approximately 400 HV. The hardness and wear resistance were increased upon addition of Cr as an alloying element. Increasing the PGFR increased the hardness and wear resistance of the hardfacings, as well as increasing the number of surface cracks. Increasing the plasma transferred arc (PTA) current resulted in hardfacings with fewer cracks but lowered the wear resistance.

4

Mikroobróbka laserowa

Woźniak Anna, Adamiak Marcin

LAB Laboratoria, Aparatura, Badania

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2021

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R. 26, nr 2

45--50

5

Jakość obserwacji mikroskopowych w funkcji czasu trawienia z zastosowaniem mikroskopii świetlnej i konfokalnej

Białas Oktawian, Skowronek Adam, Adamiak Marcin

LAB Laboratoria, Aparatura, Badania

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2021

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R. 26, nr 3

31--34

6

The influence of plasma-sprayed coatings on surface properties and corrosion resistance of 316L stainless steel for possible implant application

Woźniak Anna, Staszuk Marcin, Reimann Łukasz, Bialas Oktawian, Brytan Zbigniew, Voinarovych Sergii, Kyslytsia Oleksandr, Kaliuzhnyi Sergii, Basiaga Marcin, Adamiak Marcin

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 4

223--243

EN

Herein, we analyzed the morphology of atmospheric plasma-sprayed (APS) coating on medical 316L stainless steel and its influence on the physical and electrochemical properties of implant application. Five types of coatings were examined: hydroxyapatite (HAp), titanium (Ti), zirconium (Zr), Ti/HAp and Zr/HAp. The base properties of the coatings were analyzed via chemical and phase composition, surface topography, surface wettability and in particular the corrosion resistance in Ringer solution in immersed conditions and potentiodynamic test, and EIS analysis. APS coating of pure HAp on 316L stainless steel showed poor cohesive bonding to the substrate material, whereas the application of Ti and Zr interlayer prior to HAp deposition improved surface morphology and coating properties. The beneficial effect of Ti and Zr interlayer under HAp layer on binding was demonstrated. HAp containing coatings (HAp, Ti/HAp and Zr/HAp) show Ca/P ratio greater than 1.8, which may positively influence the differentiation of osteogenic cells and good adhesion to bones. Among the studied materials, the composite coatings with Zr or Zr/HAp showed favorable physicochemical properties and the highest corrosion resistance in Ringer solution.

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Comparison of tribological properties and structure of coatings produced in powder flame spraying process on grey cast iron

Czupryński Artur, Adamiak Marcin, Bayraktar Emin, Wyględacz Bernard

Welding Technology Review

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2020

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R. 92, nr 3

7--21

EN

In this article results of tribological and structural properties comparison of flame sprayed, by SupJet-S-Eutalloy® multipurpose system, two self-fluxing alloys of Ni-B-Si type in the form of powder for spraying with remelting are presented. Layers were produced on EN-GJL-250 grade grey cast iron with flake graphite in an austenitic matrix. Abrasive wear resistance examination acc. to ASTM G65-00 and erosive wear resistance examination acc. to ASTM G76-2 were performed. Obtained results were compared with abrasion-resistant steel Hardox® 400. Macro- and microscopic examination were carried enabling layer quality evaluation and structure of examined layer and base material determination. X-ray microanalysis was performed to obtain qualitative and quantitative data about microareas chemical composition. The Eutalloy® BronzoChrom 10185 powder flame sprayed layer with higher Boron and Silicon content was characterized by 13% lower wear intensity under mineral abrasive conditions and about 30% higher erosion wear resistance than Eutalloy® NiTec 10224 powder flame sprayed layer.

PL

W artykule przedstawiono wyniki badań dotyczące porównania właściwości tribologicznych i strukturalnych powłok, natryskiwanych płomieniowo za pomocą wielofunkcyjnego systemu SupJet-S-Eutalloy® dwoma różniącymi się składem chemicznym samotopnikującymi stopami typu Ni-B-Si w postaci proszku metalicznego przeznaczonego do natrysku z jednoczesnym przetopieniem. Powłoki wykonano na podłożu z żeliwa szarego gatunku EN-GJL-250 z grafitem płatkowym w osnowie austenitycznej. Przeprowadzono badania odporności na zużycie ścierne wg normy ASTM G65-00 oraz odporności na zużycie erozyjne zgodnie z normą ASTM G 76-2. Uzyskane wyniki porównano z parametrami zużycia abrazyjnego stali trudnościeralnej Hardox® 400. Wykonano obserwacje metalograficzne makro i mikroskopowe pozwalające na określenie jakości powłok oraz struktur badanych warstw i materiału podłoża. W celu określenia jakościowego i ilościowego składu chemicznego mikroobszarów powłok przeprowadzono badania metodą mikroanalizy rentgenowskiej. Stwierdzono, że powłoka natryskiwana płomieniowo proszkiem Eutalloy® BronzoChrom 10185 zawierającym większe stężenie boru i krzemu wykazywała o ok. 13% mniejszą intensywność zużycia pod wpływem oddziaływania ścierniwa mineralnego oraz o ok. 30% większą odporność na zużycie erozyjne niż powłoka natryskiwana płomieniowo proszkiem Eutalloy® NiTec 10224.