http://arthra.ugal.ro/handle/20.500.14043/25772 2026-04-19T10:10:00Z 2026-04-19T10:10:00Z Constantinescu, Stela http://arthra.ugal.ro/handle/20.500.14043/25785 2020-09-03T13:27:46Z 2014-01-01T00:00:00Z

Residual Stress and Tribology Behaviour of TiCx Coating Deposited by NPCVD Method Constantinescu, Stela In this paper, thin TiCx films were coated by chemical vapour deposition method, and various duty cycles were carried out in order to observe the influence of this parameter on residual stress and tribology behaviours. The duty cycles were 35, 43 and 50% at 500 oC operating temperature. Therefore, wear behaviour, hardness and chemical analyses of TiCx coating were characterised, and it was found that the residual stresses in the coating were compressive, which were- 1.14189 - 0.12985 and -0.1749 MPa at three different duty cycles, i.e. 35, 43 and 50% respectively. According to the results, the coating that was applied at 43% exhibited superior wear resistance and possessed the lowest friction coefficient of ~ 0.059 in a pin-on-disc test. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 2 – 2014, ISSN 1453 – 083X

2014-01-01T00:00:00Z Anca, Denisa Elena Panciu, Elena Chișamera, Mihai http://arthra.ugal.ro/handle/20.500.14043/25784 2020-09-03T13:27:46Z 2014-01-01T00:00:00Z

The Influence of Different Coatings on the Grafhite Degeneration in the Superficial Layer of Iron Castings Anca, Denisa Elena; Panciu, Elena; Chișamera, Mihai The main objective of this experimenal reserch is to investigate new possibilities for reducing the graphite degeneration phenomenon in the superficial layer of iron castings. For the experiment, a spheroidal graphite cast iron was poured in standard Quik-Cup moulds covered with various types of coatings. The sources of sulfur and oxygen used for coatings were based on FeS2 and Fe2O3, respectively. After applying the coatings with sulfur or oxygen sources on the inner surface of the cups and after drying them, coatings based on iron powder and carbon containing powder respectively, were applied to block sulfur or oxygen access from the mould to the liquid iron. The coatings effect was evaluated by measuring the thickness of graphite degenerated surface layer and also by graphite nodularity and graphite shape factors deplating in the surface layer of the cast samples. The experimental results show a protective effect of the coating based on iron powder against the sulfur source while the coating based on carbon containing powder exerts a protective effect against the oxygen source. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 2 – 2014, ISSN 1453 – 083X

2014-01-01T00:00:00Z Marin, Mihaela Potecașu, Florentina Alexandru, Petrică Potecașu, Octavian Drugescu, Elena http://arthra.ugal.ro/handle/20.500.14043/25783 2020-09-03T13:27:46Z 2014-01-01T00:00:00Z

Wear Behavior of Carburizing on Powder Metallurgy Alloys Marin, Mihaela; Potecașu, Florentina; Alexandru, Petrică; Potecașu, Octavian; Drugescu, Elena In this paper is studied the influence of wear behavior of carburizing in fluidized-bed on sintered alloys produced by powder metallurgy route. In powder metallurgy, carburization is a thermochemically treatment that occurs in the temperature range of 850-950 ºC and had a great importance to establish the correlation between porosity and carbon diffusion. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 2 – 2014, ISSN 1453 – 083X

2014-01-01T00:00:00Z Bălan, Vasile Bordei, Marian http://arthra.ugal.ro/handle/20.500.14043/25782 2020-09-03T13:27:46Z 2014-01-01T00:00:00Z

Study Related to improve Performance of a Neutralizing Gas Dynamics System Bălan, Vasile; Bordei, Marian Worldwide, the series of attacks "with bomb" are the most common, accounting for over 80% of terrorist attacks. The many constructive solutions of Improvised Explosive Devices (I.E.D), would require for defusing sequence at least as many variations of cancellation. To anticipate in a shorter time (intervention time) the manner in which an explosive device was made (possibly, up to several months) is another factor leading to the adoption of a uniform neutralization solution by mechanical disruption (mechanical separation of the constituent elements of a hand made explosive device, using different agents of disruption). In this paper, we analyzed the possibility to improve performance of a neutralizing gas dynamics system. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 2 – 2014, ISSN 1453 – 083X

2014-01-01T00:00:00Z