Design and Microstructure of Innovative Cobalt Base Alloy

Abstract

Design and characterization of modified Cobalt base alloy for biological applications have been studied and compared. In particular, modification has been realized by addition of Mo, Ti and Zr to better fit the requirements for dental applications. On the samples morphological and surface analysis including residual stress determination have been considered. As a result of this study, a positive effect of Ti addition has been demonstrated. Contrarily, a simultaneous addition of Ti and Zr does not promote any enhancement as microstructure and properties concern.

Study of Ti-Enriched CoCrMo Alloy for Dental Application

“…As previously reported by the authors [32], [33] the microstructure in as-cast state reveals a non-homogeneous nature, and according to the ternary equilibrium diagram, the presence of the solid solution (dark areas in the Figs. carbides formation has been identified.…”

“…Another well-recognized and world-wide used alloy for more the 30 years is related to the Wironit, while Heraenium alloys are clinically evaluated, biocompatible and corrosion-resistant Co-Cr metal/ceramic alloy which represents an low-cost option for reliable, high quality dental restorations for crowns and bridges. Such alloys do not contain Be, Cd and Ni and guarantee good processing properties combined to good corrosion resistance [32], [33]. For removable partial dentures the most employed alloys belong to the Co-Cr system and consist of about 50% Co, 25% Cr, 19% Ni with minor other elements.…”

Laser Welding of Different Dental Alloys

“…Welding experiments on complex CoCrMoTi(Zr) alloys, CoCrMoZrTi alloy, CoCrMoTi4 alloy, and CoCrMoTi5.5 alloy [18][19][20][21][22][23][24], were performed by selecting three categories of parameters, a selection which was made following previous tests on cobalt alloys. For this purpose, the welding parameters were chosen, with three values of the laser spot power, namely, low power (1.9 W), average power (2.0 W), and higher power (2.3 W); the times of application of the spot, namely, short (1.1 s) or long (1.3 s); and the frequency of the spot application at two levels, respectively, 2.0 Hz and 3.0 Hz.…”

Numerical Investigation for Evaluation and Prevention of Casting Defects in TiAl Alloys

“…Moreover, principally thanks to their superior biocompatibility, Titanium and its alloys represent the most attractive choice for the production of a large variety of medical devices. Contrarily, their poor low temperature ductility, laborious/hard formability and their limited oxidation resistance above 750-800°C which control their application at superior temperatures [6][7][8][9] represent some inconveniences that however can be handled in most of the applications.…”