Abstract
Owing to the increasing demand in ultra-precision machining of biocompatible materials, the demand to improve the performance of cutting processes and tools becomes progressively important. To increase the performance of the micro-tools leading to longer tool life and better surface finish, applications of solid lubricant coatings are necessary. Diamond-like carbon (DLC) coatings have been successfully used in many conventional cutting tools. In this study, the performance of the DLC coating in tungsten carbide micro-mills will be evaluated during the ultra-precision machining of a biocompatible material, namely, tantalum (99%). Experiments were carried out on the sliding pin-on-disk test and micro-machining both coated and uncoated. As expected, the DLC film deposited reduces both the friction coefficient and the wear. The results of the tests showed that the coated tools have less wear, evidenced by the distance 130% greater than the uncoated tools. Consequently, it also induces a reduction in the specific cutting forces (kS) and critical chip thickness. Thus, a better accuracy and surface finish on tantalum biocompatible parts can be reached.
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This work was partly financed by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)–Finance Code 001, and the Organization of American States (OEA), which are the suppliers of the Ph. D. scholarship. Also, it must be acknowledged the financial support of the CNPq and FAPEMIG. Likewise, the authors would like to thank the ATI Specialty Alloys Components for providing the tantalum piece.
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Professor Juan Carlos Campos Rubio is the leader of the research team. David Jonhson Barcelos performed the film thickness experiments, the Raman scattering spectroscopy, and the scratch test, and Marcelo Araújo Câmara helped to analyze the data. Andrés Guasca González performed the pin-on-disk test and micro-milling test, and Juan Carlos Campos Rubio helped to analyze the data. Wanderson Leite and Francisco Mata wrote, edited, and reviewed the paper.
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Campos Rubio, J.C., Guasca González, A.G., Barcelos, D.J. et al. Tribological analysis and performance of a DLC coating on tungsten carbide micro-tools to use at tantalum precision machining. Int J Adv Manuf Technol 116, 719–732 (2021). https://doi.org/10.1007/s00170-021-07371-1
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DOI: https://doi.org/10.1007/s00170-021-07371-1