Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
INFLUENCE OF PROCESSING PARAMETERS ON THE LASER MICROMACHINING AND TEXTURING OF 3Y-TZP COMPACTS DOPED WITH GRAPHITE
Submission Author:
Bruno Alexandre Pacheco de Castro Henriques , SC
Co-Authors:
Pedro Griebeler Oliveira, Douglas Fabris, Marcio C. Fredel, Bruno Alexandre Pacheco de Castro Henriques, Claudio Abilio da Silveira, Milton Pereira
Presenter: Pedro Griebeler Oliveira
doi://10.26678/ABCM.COBEM2023.COB2023-2424
Abstract
Ceramic materials are interesting for certain applications due to their properties, such as: low thermal conductivity, excellent wear resistance and chemical stability. Zirconia (3Y-TZP), for instance, stands as an example of high strength ceramic that has been extensively used as a material in dental and hip implants due to its outstanding mechanical properties, biocompatibility and aesthetics. However, mechanical and physical properties make ceramics, such as 3Y-TZP, difficult to shape and to work using conventional cutting tools, especially on its sintered form. In this sense, non-conventional machining processes, such as laser beam machining (LBM), are being tested on these materials. The aim of this work was to optimize the process of laser micro-machining on Yttria stabilized Zirconia (3Y-TZP) by adding graphite powders on different contents (0.5%, 1% and 5% wt%) aiming at improving optical and thermal properties (higher light absorption and thermal conductivity). A 1064 nm nanosecond-pulsed Direct Laser Writing (DLW) system was used to produce squared grooves in compact green samples. Laser parameters were varied to evaluate its influence. The material removal behavior, surface characteristic and material behavior were investigated experimentally. It was found that material doped with graphite had higher material removal rates than pure Zirconia material. However, graphite composites showed lower surface quality.
Keywords
zirconia-titania, graphite, Laser micromachining, Green ceramics
