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Development of consolidation parameters in selective laser melting technology using metallic biomaterials powder

Grant number: 17/07657-6
Support type:Research Grants - Innovative Research in Small Business - PIPE
Duration: January 01, 2019 - September 30, 2019
Field of knowledge:Engineering - Mechanical Engineering - Manufacturing Processes
Principal Investigator:Antonio Carlos Alvarez Fasano
Grantee:Antonio Carlos Alvarez Fasano
Company:Omnitek Tecnologia Ltda
CNAE: Fabricação de instrumentos e materiais para uso médico e odontológico e de artigos ópticos
Testes e análises técnicas
Pesquisa e desenvolvimento experimental em ciências físicas e naturais
City: São Paulo
Co-Principal Investigators:Maurício David Martins das Neves
Assoc. researchers:Carlos Eduardo Podesta ; Cristiano Nascimento Alves ; Eduardo Gavira Bonani ; Jabes Dias Sena ; Marcello Vertamatti Mergulhão ; Ricardo Luiz Ciuccio

Abstract

Currently, the additive manufacturing techniques (AM), notably cited by 3D printing techniques have been addressed in large merger in the various industrial and representable developing scientific field markets. Specifically, the development of components in the medical and dental area becomes increasingly promising using selective laser melting (SLM) technology. It proposes in this project to study the influence of process parameters used in the selective melting laser equipment using powders of CoCr and stainless steel 316L alloys. Comparing the mechanical properties and evaluate the microstructure of standard samples manufactured from spherical powders produced by gas atomization and spherodized powders by plasma, those obtained by water atomization process. This project aims to study scanning strategies (directions and guidelines) through programming to optimize the consolidation samples. The need to develop other models becomes extremely important for purposes of providing a final component with low residual stresses, resulting from the manufacturing process. As well as establish an optimized route consolidation. In a preliminary way must be carried physical characteristics of the powders to obtain the best performance in the AM process. It is noteworthy that spherodized powders, obtained by treatment via inductively coupled plasma, the state of the art have not been used in the manufacture of components for AM via SLM. The importance of spherodizing treatment is associated with the direction of turning the water atomized powders, or powders processed with an irregular geometry, for post spherical geometry. In addition to the effective removal of contamination (rust and impurities) and packaging properties, compared to traditional processes for obtaining powders. The development of this project should be made in several steps mentioned following briefly. 1) Obtaining powders in spherical geometry (atomization gas) of the studied alloys. 2) Obtaining powders in irregular geometry (water atomization) of the studied alloys. 3) Spherodizing of water atomized powders, analysis of the physical and chemical properties of the starting powders. 4) Consolidation of samples via SLM in different manufacturing parameters. 5) Evaluation of mechanical and microstructural properties of SLM samples. The proposal is intend to optimize the process of consolidation of post aiming to acquire superior properties and achieve greater manufacturing efficiency over the sequence of melting and machining. Therefore, consolidated samples under these conditions, i.e., which have better properties should be made for subsequent validation study and meeting the regulatory requirements of dentures and dental and medical components. The expected results of this project have the optimization of post consolidation process using the process of AM via SLM, which can enable greater efficiency and the development of an emerging technology in the domestic market. As well, this can advance in the consolidation of bimetallic components, shall foster the domestic market by reducing the demand for atomized powders to the international market gas. (AU)