Processamento e caracterização da liga 66%Co-28%Cr-6%Mo para implantes

Santos, Luiz Alberto dos

doi:10.11606/d.97.2012.tde-01102013-143822

Cited by 5 publications

(14 citation statements)

References 4 publications

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“…This occurrence is similar to that described in Ref. [16,60], which obtains endothermic peaks, respectively, at approximately 970 and 1000°C, relative to that obtained in the present study of 944.52°C. This temperature difference is associated with the chemical composition of the alloy (64Co-29Cr-7Mo of the present study), which represent alloys according to ASTM F75-12 (stoichiometry is 66Co-28Cr-6Mo) and therefore there are temperature difference of 26 and 56°C relative to the cited references.…”

Section: Powder Characterizationsupporting

confidence: 93%

“…In relation to the first event (exothermic), occurring around 582.81°C, it is related to the phase transformation of the alloy (precisely from Co), from the cubic face (αCo) phase to the compact hexagonal phase (εCo). In a similar analysis, Santos [16] obtained a slight peak at 600°C…”

Section: Powder Characterizationmentioning

confidence: 66%

“…In this case, it is shown by Refs. [6,15,16] that Co-Cr alloys should have a CTE value in the range of 14.0-14.6 × 10 −6 °C −1 at temperatures from 500 to 600°C to the correct ceramic firing process, as coating of the metal component. The CTE of ceramic materials for coating applications in metallic materials should be close, providing a good adjustment due to contraction and expansion during heating, thus avoiding the possibility of voids or cracks occurring during the firing process [15,17].…”

Section: Introductionmentioning

confidence: 99%

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Perspective of Additive Manufacturing Selective Laser Melting in Co-Cr-Mo Alloy in the Consolidation of Dental Prosthesis

Mergulhão¹,

Podestá²,

Neves³

2018

Biomaterials in Regenerative Medicine

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This chapter seeks to compare the properties of samples manufactured by additive manufacturing (AM) by the selective laser melting (SLM) technology and compare with the precision casting (PC) processes using the Co-Cr-Mo (ASTM F75) alloy to manufacture of dental prosthesis. This AM process can be manufactured three-dimensional models by means of a laser beam that completely melts particles of powder deposited layer by layer. However, it is still relevant to know the properties of: performance, dimensional, mechanical and microstructural of this laser melting process and compare with a convencional process. The results of mechanical evaluation showed that the SLM technique provides superior mechanical properties compared to those obtained by the PC technique. It is possible to verify that the consolidation by SLM technique results in lower presence of porosity than PC technique. In addition, PC samples presented a gross dendritic microstructure of casting process. Microstructural analysis of SLM samples results in a characteristic morphology of layer manufacturing with ultrafine grains and a high chemical homogeneity. In this way, the development of the present study evidenced to improve the manufacture of customized components (copings) using the SLM technology.

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Section: Powder Characterizationsupporting

confidence: 93%

Section: Powder Characterizationmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

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Perspective of Additive Manufacturing Selective Laser Melting in Co-Cr-Mo Alloy in the Consolidation of Dental Prosthesis

Mergulhão¹,

Podestá²,

Neves³

2018

Biomaterials in Regenerative Medicine

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“…Esta característica mecânica é associada pela matriz do cobalto possuir uma estabilidade estrutural inferior comparada com a do níquel, a qual é introduzida pela presença de estabilidade por parte do precipitado coerente γ´ (GESSINGER, 1984). O cobalto é um material que apresenta uma transformação alotrópica do seu estado estável de estrutura cristalina hexagonal compacta (cobalto Ɛ -HC) para a estrutura cúbica de face centrada (cobalto α -CFC), à temperatura de 422°C, (ASM INTERNACIONAL, 2000;GESSINGER, 1984 HEDBERG et al, 2014;KIM et al, 2016b;LUCCHETTI et al, 2015;MARTÍNEZ et al, 2013;MAS-AYU et al, 2013;SANTOS, 2012 et al, 1990).…”

Section: Ligas à Base De Cobaltounclassified

“…Estudos térmicos de ligas de Co-Cr-Mo são abordadas por diversos autores (CRAIG, 2012;KAISER et al, 2013;LIU et al, 2010;MCCABE;WALLS, 2008;RAMÍREZ-VIDAURRI et al, 2009;SANTOS, 2012) analisando outras propriedades térmicas de interesse, como por exemplo, a temperatura de solidificação (a qual ocorre na faixa de 1350 a 1390°C) e o coeficiente de dilatação térmico (aproximadamente entre 14,0 a 15,0.10 -6°C-1 ).…”

Section: Ligas à Base De Cobaltounclassified

Avaliação de propriedades mecânicas e caracterização microestrutural de consolidados de Cobalto-Cromo-Molibdênio obtidos por fusão seletiva a laser e fundição de precisão

Mergulhão¹

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The objective of this work was to study the mechanical properties and microstructural characterization of specimens of the Co-Cr-Mo alloy obtained by additive manufacturingselective laser melting (SLM) and precision casting aiming at the manufacture of dental prostheses. The following steps were carried out on Co-Cr-Mo gas-atomized powders: 1) investigation of the physical, chemical and thermal properties of atomized powders in different grain sizes (denominated: D1 <15 μm, D2 20-50 μm and D3 > 75 μm); 2) the consolidation of standard specimens via consolidation techniques; 3) characterization of consolidated by analysis of: cytotoxicity, porosity, X ray diffraction and dilatometry; 4) mechanical characterization of tensile, 3 point bending, hardness (macro and micro Vickers) tests and microstructural characterization (optical and scanning electron microscopy). In general, the results observed were: the grain size D2 (20-50 μm) is the one that best fits in the analysis of packaging, for the consolidation by SLM; the biocompatibility of the samples obtained a positive result for both processing techniques; the mechanical evaluation of the specimens shows that the SLM technique provides superior mechanical properties (yield stress, rupture stress, maximum stress, elongation and hardness), compared to those obtained by the precision casting technique; the microstructure obtained by the SLM process results in an ultrafine grains with high chemical homogeneity, differentiated by the gross dendritic microstructure in the casting process. In this way, the development of the present study evidenced superior quality in manufacturing customized dental components (copings) by SLM technique compared to precision casting.

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Metal Oxide Laser Ionization Mass Spectrometry Imaging (MOLI MSI) Using Cerium(IV) Oxide

et al. 2019

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Matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI MSI) is a powerful technique for spatially-resolved metabolomics. A variation on MALDI, termed metal oxide laser ionization (MOLI), capitalizes on the unique property of cerium(IV) oxide (CeO 2) to induce laser-catalyzed fatty acyl cleavage from lipids and has been utilized for bacterial identification. In this study, we present the development and utilization of CeO 2 as an MSI catalyst. The method was developed using a MALDI TOF instrument in negative ion mode, equipped with a high frequency laser. Instrument parameters for MOLI MS fatty acid catalysis with CeO 2 were optimized with phospholipid standards and fatty acid catalysis was confirmed using lipid extracts from reference bacterial strains, and sample preparation was optimized using mouse brain tissue. MOLI MSI was applied to the imaging of normal mouse brain revealing differentiable fatty acyl pools in myelinated and non-myelinated regions. Similarly, MOLI MSI showed distinct fatty acyl composition in tumor regions of a patient derived xenograft mouse model of glioblastoma. To assess the potential of MOLI MSI to detect pathogens directly from tissue, a pseudo-infection model was prepared by spotting Escherichia coli lipid extracts on mouse *

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Processamento e caracterização da liga 66%Co-28%Cr-6%Mo para implantes

Cited by 5 publications

References 4 publications

Perspective of Additive Manufacturing Selective Laser Melting in Co-Cr-Mo Alloy in the Consolidation of Dental Prosthesis

Perspective of Additive Manufacturing Selective Laser Melting in Co-Cr-Mo Alloy in the Consolidation of Dental Prosthesis

Avaliação de propriedades mecânicas e caracterização microestrutural de consolidados de Cobalto-Cromo-Molibdênio obtidos por fusão seletiva a laser e fundição de precisão

Metal Oxide Laser Ionization Mass Spectrometry Imaging (MOLI MSI) Using Cerium(IV) Oxide

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