http://arthra.ugal.ro/handle/20.500.14043/25700 2026-04-04T09:40:42Z 2026-04-04T09:40:42Z Geamăn, Virgil Pop, Mihai Alin Jiman, Vasile http://arthra.ugal.ro/handle/20.500.14043/25714 2020-09-03T13:27:38Z 2012-01-01T00:00:00Z

Aluminum Foams with Closed Pores Obtained by Casting Techniques Geamăn, Virgil; Pop, Mihai Alin; Jiman, Vasile Techniques for the preparation of metallic foams, including casting, powder metallurgy and metallic deposition, have been reviewed. There is a present interest in the development of materials capable of plastic deforming to absorb the effects of shock and impact. Solid foams form an important class of lightweight, cellular engineering materials to meet these threats. The foam materials themselves may be divided into two classes according to their morphology. The first group is open cell structured foams containing pores that are connected to each other and form an interconnected network. The second class does not have interconnected pores and is termed as closed cell foams. The paper presents some experimental data for obtaining aluminum foams with hollow pores by casting techniques. The specific equipment used for experiments is also described. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 1 – 2012, ISSN 1453 – 083X

2012-01-01T00:00:00Z Danciu, Anca-Ionela Mușat, Viorica Busani, Tito Gonçalves, Alexandra Pinto, Joana V. Costa, Mafalda Bernacka-Wojcik, Iwona Martines, Rodrigo Fortunato, Elvira http://arthra.ugal.ro/handle/20.500.14043/25713 2020-09-03T13:27:38Z 2012-01-01T00:00:00Z

Selective Growth of 1D Nanostructured Oxide Materials Using PDMS Stamp Danciu, Anca-Ionela; Mușat, Viorica; Busani, Tito; Gonçalves, Alexandra; Pinto, Joana V.; Costa, Mafalda; Bernacka-Wojcik, Iwona; Martines, Rodrigo; Fortunato, Elvira The approach for selective growth of 1D nanostructured oxide materials using poly (dimethylsiloxane) (PDMS) stamp consists of using microcontact printing, as such the soft lithography technique, for transferring the pattern of ZnO film on a substrate, followed by the hydrothermal growth of 1D nanowires on patterned areas. The nanowires have been grown in aqueous solutions of zinc nitrate at temperature at 95°C. The wettability of the glass and of the Si/SiO2 substrates was investigated by contact angle measurements. The morphology of the nanostructures obtained was characterized by optical microscopy and scanning electron micoscopy. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 1 – 2012, ISSN 1453 – 083X

2012-01-01T00:00:00Z Carcea, Ioan Bălțătescu, Oana Floarea, Raluca-Maria http://arthra.ugal.ro/handle/20.500.14043/25712 2020-09-03T13:27:38Z 2012-01-01T00:00:00Z

Aspects Regarding the Tradition of Bell Manufacture and USE Carcea, Ioan; Bălțătescu, Oana; Floarea, Raluca-Maria The paper presents the casting art of bells, their spiritual significance, as well as their evolution over time. The bells may be made of both metallic or/and nonmetallic materials, of various shapes and sizes. While producing the adequate sounds, bells have found a universal use: they served as musical instruments, sound devices used in religious rituals, for communication and warning signals. In the European world, the progress and the performances regarding of bells development are owed to their use in the Christian Church rituals. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 1 – 2012, ISSN 1453 – 083X

2012-01-01T00:00:00Z Mardare, Eliza Benea, Lidia Celis, Jean-Pierre http://arthra.ugal.ro/handle/20.500.14043/25711 2020-09-03T13:27:38Z 2012-01-01T00:00:00Z

Influence of Normale Loads on Corrosion Behaviour of Ti-6Al-4V Alloy During Fretting in Artificial Saliva Mardare, Eliza; Benea, Lidia; Celis, Jean-Pierre The fretting corrosion behaviour of untreated Ti-6Al-4V alloy in artificial saliva solution was evaluated based on the change in open circuit potential (OCP) measured as a function of time. Fretting corrosion experiments were performed using a unidirectional reciprocating fretting experimental set-up which was mechanically and electrochemically instrumented, under various solicitation conditions. The effect of applied normal force on corrosion-wear of the tested material was determined. Before the onset of fretting a large increase of the OCP in the noble direction for the Ti-6Al-4V alloy was observed. With the onset of fretting it was observed a cathodic shift in OCP, shift which decreases linearly with increasing normal load. The restoration ability of Ti-6Al-4V alloy after the passive films damaged during fretting was observed after the fretting motion ceased. It was confirmed a decrease in friction coefficient with gradually increasing load. The morphological features of the fretted zone and the wear mechanism were assessed using scanning electron microscopy and non-contact optical profilometer. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 1 – 2012, ISSN 1453 – 083X

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