Title: Effect of different sintering conditions on microstructural characterisation of Co-Cr metal laser powder

Authors: Gürel Pekkan; Eda Taşçı; Keriman Pekkan; Murat Ispalarlı

Addresses: Faculty of Dentistry, Department of Prosthodontics, Tekirdag Namik Kemal University, Degirmenalti Yerleskesi, 59030, Suleymanpasa, Tekirdag, Turkey ' Faculty of Dentistry, Department of Prosthodontics, Tekirdag Namik Kemal University, Degirmenalti Yerleskesi, 59030, Suleymanpasa, Tekirdag, Turkey ' Faculty of Dentistry, Department of Prosthodontics, Tekirdag Namik Kemal University, Degirmenalti Yerleskesi, 59030, Suleymanpasa, Tekirdag, Turkey ' Faculty of Dentistry, Department of Prosthodontics, Tekirdag Namik Kemal University, Degirmenalti Yerleskesi, 59030, Suleymanpasa, Tekirdag, Turkey

Abstract: Co-Cr alloys have been used for many years in dentistry. In recent years, the fabrication of prosthetic restorations from Co-Cr alloys by metal laser sintering method has become widespread. This method is a combination of powder metallurgy and three-dimensional printing technologies. The surface microstructure of the material and the different phases formed on the surface of the material after sintering and heat treatment are extremely important since these metal substructures are layered with dental porcelain in fixed prosthetic dentistry. In this study, characterisation of Co-Cr alloy samples produced by direct metal laser sintering (DMLS) method and sintering under various atmospheric conditions were performed with X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy-dispersive X-ray diffractometer (EDX). It was observed that sintering with different methods under various atmospheric conditions affected the XRD phase intensities. The sintering in the argon gas atmosphere yielded a more significant phase separation that facilitates the identification of different phases in XRD patterns.

Keywords: laser metal powder; selective laser sintering; characterisation; XRD; X-ray diffractometer; SEM; scanning electron microscope; EDX; energy-dispersive X-ray diffractometer; Co-Cr alloy; argon.

DOI: 10.1504/IJMMP.2020.104610

International Journal of Microstructure and Materials Properties, 2020 Vol.15 No.1, pp.26 - 35

Received: 05 Apr 2019
Accepted: 22 Oct 2019
Published online: 23 Jan 2020 *

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