91. High sensitivity measurements of gas transport through films for food packaging and the ▫$O_2$▫ adsorption issueMarine Schott, Janez Šetina, Espedito Vassallo, Matteo Pedroni, Roberta Campardelli, Patrizia Perego, Luca Repetto, Giuseppe Firpo, 2023, original scientific article Keywords: oxygen transmission rate, food packaging, gas permeability, O2adsorption Published in DiRROS: 26.01.2024; Views: 178; Downloads: 91 Full text (2,56 MB) This document has many files! More... |
92. Optimizing hot-work tool steel microstructure for enhanced toughnessAnže Bajželj, Tilen Balaško, Barbara Šetina, Jaka Burja, 2024, original scientific article Keywords: hot-work tool steel, austempering, bainitic transformation, lower bainite, impact toughness Published in DiRROS: 24.01.2024; Views: 220; Downloads: 96 Full text (9,12 MB) This document has many files! More... |
93. Differences between 3-D printed and traditionally milled CoCr dental alloy from casted block in oral environmentMirjam Bajt Leban, Matej Kurnik, Igor Kopač, Matic Klug Jovičević, Bojan Podgornik, Tadeja Kosec, 2023, original scientific article Abstract: The aim of this study was to compare corrosion resistance and ion release in CoCr dental alloys with identical chemical compositions produced using different technologies (SLM – selective laser melting and milling from cast blocks) and heat treatment (SLM parts only). The corrosion properties were tested in artificial saliva, artificial saliva with fluoride ions, and artificial saliva with added lactic acid to simulate inflammations. The study included electrochemical tests, microstructural investigation and ion release tests in the three different environments for a total of 42 days. The best performance of CoCr as a result of potentiodynamic polarization was observed in the artificial saliva with added lactic acid, which is in contradiction with the highest ion release measured from all the materials tested and electrochemical impedance spectroscopy that showed a deterioration of the passive layer in an acidic environment. Microstructural investigation revealed that different phases precipitated by heat treatment trigger increased release of Mo and W ions. The printing method does not raise critically ion release from CoCr alloy, while the state of the surface greatly impacts the extent of the ion release. This study demonstrates the importance of an interdisciplinary approach to the study of corrosion and biocompatibility in dental alloys. Keywords: CoCr dental alloy, selective laser melting, corrosion, ion release, artificial saliva Published in DiRROS: 29.05.2023; Views: 343; Downloads: 290 Full text (9,28 MB) This document has many files! More... |
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96. The influence of the plasma-nitriding temperature on the microstructure evolution and surface properties of additive-manufactured 18Ni300 maraging steelMatjaž Godec, Francisco Ruiz-Zepeda, Bojan Podgornik, Črtomir Donik, Aleksandra Kocijan, Danijela Anica Skobir Balantič, 2022, original scientific article Keywords: maraging steel, powder bed fusion, plasma nitriding, microstructure, wear resistance, corrosion resistance Published in DiRROS: 06.05.2022; Views: 591; Downloads: 206 Full text (6,68 MB) This document has many files! More... |