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3 Archives of Metallurgy and Materials

3 2022

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Obtaining and Analyzing the Al2O3-ZrO2 Ceramic Layers on Metallic Substrate

Lutcanu Marian, Coteață Margareta, Bernevig Mihai Adrian, Nechifor Cristina-Delia, Cazacu Marius Mihai, Paraschiv Petronela, Istrate Bogdan, Bădărău Gheorghe, Sandu Ioan Gabriel, Cimpoeșu Nicanor

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 2

479--485

In this case ceramic layers from Metco ZrO2 and Al2O3 powders mixture (25/75; 50/50 and 75/25) were obtained through atmospheric plasma spraying (APS) after five passes on low carbon steel substrate. The sample surfaces mechanically grinded (160-2400) before and after ceramic layer deposition. Powder’s mixtures and the surface of ceramic thin layers were analyzed through: scanning electron microscopy (SEM). In order to understand the effect of surface wettability of the ceramic layers, before and after grinding the surface, three different liquids were used. Experimental results confirm the modification of the steel substrate surface characteristic from hydrophilic to hydrophobic when the ceramic layer was deposited. Surface free energy of hydration increases for all the samples with zirconia percentage addition before polishing process.

Obtaining and Analysis of a New Aluminium Bronze Material Using Induction Furnace

Chelariu Romeo Gabriel, Cimpoeșu Nicanor, Birnoveanu Teodora Irina, Istrate Bogdan, Baciu Constantin, Bejinariu Costica

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 4

1251--1257

Copper-based alloys with the addition of Al present excellent properties and can be considered a proper choice for applications as contact materials based on their good strength and fret resistance. Cu-Al alloys are used in different systems parts as bearings, gears and worm gears. The intention is to replace steel materials with new copper-based materials for parts that work in a possible explosive environment to reduce the possibility of spark appearance. Copper-berilyum alloys are known as non-sparking alloys and are used in different tools obtaining for environments with possible explosive gaseous. Results from the obtaining and analysis of a new alloy based on CuAlBe are given. The material was melted in a vacuum induction furnace from CuBe master alloy and high purity aluminium and cast into a metallic die. The alloys obtained were analyzed using EDS - energy dispersive spectroscopy for chemical composition, OM-optical and SEM-electronic microscopy for the microstructure, and the electro-corrosion resistance was tested using linear Tafel diagram and cyclic potentiometry.

Contact Stress Simulation for Mg-0.5Ca-xMn Alloys used for Medical Application

Nastasa Roxana Oana, Tufescu Ana, Munteanu Corneliu, Istrate Bogdan, Przybył Anna, Ianus Gelu

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 2

405--408

In the past decades, Mg alloys have been studied intensively as potential orthopedic applications. The present research work, the FEA of the obtained contact stresses in the case of the load applied on Mg-0.5Ca-xMn alloys has been investigated. It has been used the NCB Curved Femur Shaft Plate type as a model in order to establish the necessary modeling parameters. The objective of the present work was to highlight the strain values at the contact point on the surface of the Mg-0.5Ca-xMn alloys. The results showed that the highest stresses observed near the gaps of the plate and in the screws. It means that all mechanical loads are sustained by the plate and screws, and the patient’s femur can be recovered.