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Wyszukujesz frazę "Constantin, Constantin." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Obtaining and Analysis of a New Aluminium Bronze Material Using Induction Furnace
Autorzy:
Chelariu, Romeo Gabriel
Cimpoeșu, Nicanor
Birnoveanu, Teodora Irina
Istrate, Bogdan
Baciu, Constantin
Bejinariu, Costica
Powiązania:
https://bibliotekanauki.pl/articles/2174552.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum bronze
non-sparking alloy
SEM
EDS
Tafel
Opis:
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.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1251--1257
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the Degradation Process of Railway Rails Due to Lifespan Exceeding
Autorzy:
Berbecaru, Andrei-Constantin
Coman, George
Ciucă, Sorin
Gherghescu, Ioana-Arina
Sohaciu, Mirela
Grădinaru, Catalin
Predescu, Cristian
Powiązania:
https://bibliotekanauki.pl/articles/2106587.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
degradation
advanced wear
fatigue fracture
railway rails lifespan
Opis:
The paper presents the impact of exceeding the railway rails lifespan which usually causes a railway structural failure, thus an accident. The research highlights the rails’s high degradation, especially on the running area, consisting in 60-70% weight loss by advanced wear of the rail, followed by fatigue fracture caused by alternating cyclic stresses that initiates the crack and also by tensile stresses resulting in the crack growth. The chemical composition, structural and mechanical properties were analyzed in order to establish the causes that led to the railway rails rupture.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 535--540
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photocatalytic TiO2 Nanostructures Developed on the Grade 2 Ti Material
Autorzy:
Tarcea, Claudia I.
Pantilimon, Cristian Mircea
Coman, George
Turcanu, Andreea A.
Predescu, Andra Mihaela
Matei, Ecaterina
Berbecaru, Andrei-Constantin
Predescu, Cristian
Powiązania:
https://bibliotekanauki.pl/articles/2134103.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ti material
nanostructures
photocatalytic activity
alkaline treatment
advanced oxidation
Opis:
The research focused on TiO2 nanostructures environmental applications due to the special characteristics that displayed degradation of the organic compounds into environmentally friendly products through exposure to UV light. The protocol behind obtaining the nanostructures involved the use of a Ti material exposed to alkaline treatment and advanced oxidation using NaOH solution and acetone. These studied nanostructures were analyzed extensively by using methods such as scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) for characterizing the elements, compounds and morphological properties of the material. These differences in morphology is attributed to different NaOH solution concentrations. The Ti sheets were immersed into NaOH and acetone mixed solutions for 72 hours. The best results were recorded by using 30% NaOH solution. After obtaining the 3D structures, which improve specific surface and contact area with the environment, the samples were tested under UV light in order to degrade methylene blue in order to determine their photocatalytic performance.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1079--1084
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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