Abstract
Abstract In this work, CoCrMo-base alloys specimens were produced by additive manufacturing using selective laser melting (SLM) as well as CAD/CAM milling. For SLM specimens, spherical particles were laser processed at 1320°C under argon atmosphere and submitted to thermal stress relieving at 750°C–45min. Specimens from CoCrMo blocks were milled by CAD/CAM machining and sintered at 1300°C–60min. The materials from both techniques were characterized by relative density, dilatometry, SEM/BSE, OM and XRD analysis. The mechanical properties were determined by Vickers hardness and tensile tests. The specimens from both techniques exhibited single phase γCo (FCC) and CTE of 14 x10-6 °C-1. Relative density of 95.4%/ 85.6%, hardness values near 400HV/ 350HV and UTS of 905MPa/ 780MPa were measured for SLM and CAD/CAM specimens, respectively. Higher relative density is the main factor for increased mechanical properties of SLM specimens. On the other hand, both SLM and CAD/CAM specimens present properties in accordance with ISO-22674 recommendations, compatible with dental applications such as bridges containing four or more elements as well as fully dense pontics.
Highlights
CoCrMo alloys are commonly used for dental restorations due to their high corrosion resistance, good mechanical properties and biocompatibility[1,2,3]
It can be observed the presence of near spherical particles of different diameters in both materials, which is a characteristic of atomized powder from the liquid
All specimens are single phase materials composed of γCo(FCC)
Summary
CoCrMo alloys are commonly used for dental restorations due to their high corrosion resistance, good mechanical properties and biocompatibility[1,2,3]. Dental components have been produced from these alloys by prototyping techniques, classified in two groups: additive manufacturing, such as Selective Laser Melting (SLM) technique and subtractive manufacturing, such as the milling of pre-manufactured materials assisted by CAD/CAM (Computer Aided Design/Computer-Aided Manufacturing)[4,5,6,7]. Selective laser melting (SLM) or Selective laser sintering (SLS) are prototyping techniques where the components designed in a 3D software are manufactured by depositing thin layers of powders with simultaneous in situ melting/sintering of the material. The heat source is usually a laser beam which heat up the material to a suitable temperature, allowing either diffusion in solid state or melting, Previous investigations using SLM prototyping technique have been published targeting to understand the microstructural features of the CoCrMo alloys aiming to produce biomedical devices[14,15].
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