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Ghiban A.,Polytechnic University of Bucharest | Ballesta A.E.J.,Technical University of Cartagena | Morales N.G.,Technical University of Cartagena | Pirvulescu L.D.,Casa Auto Timisoara | And 2 more authors.
Materiale Plastice | Year: 2016

In present paper there are given the results concerning wear behaviour in Ringer's solution of four titanium alloys with 5%Mo, 7%Mo, 11%Mo and 12%Mo. Structural investigations (made by both optic, electronic microscopy and X-Rays diffraction) revealed a dual phase structure consisting from alpha martensite and beta "solid solution, with the constituents proportion depending on molybdenum content. Wear rates were determined using a Talysurf profilometer in Ringer's solution for the experimental titanium-molybdenum alloys. Finally, the beneficial influence of molybdenum on wear behavior was put in evidence: the higher molybdenum content is, the lower friction coefficient is.

Ghiban A.,Polytechnic University of Bucharest | Ghiban B.,Polytechnic University of Bucharest | Peter I.,Polytechnic University of Turin | Rosso M.,Polytechnic University of Turin | And 2 more authors.
Revista de Chimie | Year: 2016

Currently, the prosthesis, both removable and fixed, are usually realized in Co-Cr-Mo alloys, which possess good corrosion resistance owing to the appropriate microstructure, but presents low machinability. Occasionally also allergic responses to the constituents of base metal alloys are observed. Most adverse tissue reactions attributed to the wearing of a base metal removable prosthesis, however, are manifestations of improper design or poor fit. Being the major component, cobalt imparts to the alloy its intrinsic corrosion resistance. Ti is one of the best biocompatible metals and is widely used as implant. In addition, the total weight of the prosthesis can be modified. The purpose of this paper is to develop new dental materials with superior mechanical performance and corrosion resistance as well as higher biocompatibility. The attention was focused on the possibility to obtain a new class of cobalt based alloy by Ti addition. Different composition of CoCrMo base system were obtained by RAV technology, alloying with 2-5%wt. Ti. Different investigations were carried out for the microstructural identification of the constituents either by energy-dispersive X-ray spectroscopy, hardness values determination and mechanical characteristic behaviour. Finally a correlation between structure-mechanical properties due to scanning electronic microscopy was made.

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