A5000335239- Advanced Machining and Optimization Techniques
- Advanced machining processes and optimization
- Advanced Surface Polishing Techniques
- Bone Tissue Engineering Materials
- Titanium Alloys Microstructure and Properties
- Metal and Thin Film Mechanics
- Advanced materials and composites
- Dental materials and restorations
- Electrospun Nanofibers in Biomedical Applications
- Orthopaedic implants and arthroplasty
- Tissue Engineering and Regenerative Medicine
- Endodontics and Root Canal Treatments
- Dental Implant Techniques and Outcomes
- Magnesium Alloys: Properties and Applications
- Dental Radiography and Imaging
- Corrosion Behavior and Inhibition
- Diamond and Carbon-based Materials Research
- Welding Techniques and Residual Stresses
- Tribology and Wear Analysis
- Xenotransplantation and immune response
- Hydrogen embrittlement and corrosion behaviors in metals
- Building materials and conservation
- Surface Treatment and Coatings
- Marine Biology and Environmental Chemistry
- Congenital Heart Disease Studies
Pontifícia Universidade Católica do Paraná
2012-2022
Pontifícia Universidade Católica de São Paulo
2016
Pontifical Catholic University of Puerto Rico
2016
The quaternary Ti-Si-C-N nanocomposite is regarded to be promising one in the biomedical field due its improved tribocorrosion performance and biocompatibility. deposition of such material on components surfaces can extend lifespan by minimizing wear debris ion releasing inside physiological environment. Therefore, this work investigates behavior low friction coatings applied ASTM F136 titanium alloy immersed a phosphate-buffered solution (PBS). were obtained plasma-enhanced magnetron...
Duplex stainless steels (DSS) show good mechanical properties, wear, corrosion resistance and fatigue strength. In order to decrease operational costs in paper pulp industry, DSS is employed through weld overlay coatings on mild or low carbon steel components. this work, the aim was evaluate properties obtained deposition of ER 2209 duplex alloy a plate (ASTM A 516 Gr 60). The performed GMAW/CMT welding process. were deposited using four heat inputs: 0.53, 1.01, 1.27 1.74 kJ/mm. Moreover,...
One of the main drawbacks observed from usage titanium alloys implants is premature failures due to excessive wear and corrosion. Among surface modification alternatives, Diamond-like carbon (DLC) coatings appear as a promisor candidate, since it has an amorphous structure chemically inert with desirable properties still solid lubricant. Dense DLC on biomaterials could be obtained by advanced vapor deposition techniques plasma immersion ion (PIID) enhanced magnetron sputtering (PEMS). This...
Plasma electrolytic oxidation (PEO) is a technique that produces hard oxide layer on the titanium surface where its properties can be tailored by changing process parameters or posterior heat treatment (HT). In this work, TiO2 with different crystallinity was produced PEO applied voltages (250 to 400 V) and post-HT at 600°C. Our aim evaluate influence of voltage HT mechanical tribological anodized Ti. There an increase in pore size, thickness, Ca/P ratio for during process. X-ray diffraction...
The aim of this work was to evaluate the ability a bioactive glass-ceramic induce apatite nucleation on titanium oxide layer produced by micro-arc oxidation. “In vitro” tests were carried out simulated body fluid solution in two different manners: one group soaked SBF, while other together with glass-ceramic. Results revealed that after 7 days, specimens SBF covered an amorphous calcium phosphate layer, plus formed crystalline suggesting thus, provides silanol groups accelerated...
To assess the effect of sodium chloride concentration in fluoridated solutions during electrochemical dissolution fractured rotary endodontic instruments.Two were assessed (solution 1: NaF 12 g L-1 + NaCl 1 , pH = 5.0; and solution 2: 180 5.0) using two tests: ProTaper Universal F1 (PTU F1) instrument polarization test for intracanal PTU fragments mandibular incisors. In first test, sets five instruments separately partially immersed each solution, electrical current was evaluated over 30...
Titanium is widely used as implant material; however, regardless of the excellent properties such low density, corrosion resistance and biocompatibility, it usually presents poor tribological behaviour. The plasma electrolytic oxidation (PEO) technique produces a high hardness ceramic layer on titanium surface, by interaction anodic oxide growth channel shock caused dielectric breakdown at voltages taking place in an aqueous electrolyte. characteristics layer, roughness, thickness, porosity,...
Wire Electrical Discharge Machining (WEDM) is one of the most important production technologies to manufacture very accurate small components and tools on any electrical conductive material. Titanium its alloys have been widely used in automobile aerospace industry as well medical engineering field. Small with complex geometrical shapes are difficult be produced titanium by both conventional nonconventional machining technologies. In this work an experimental investigation influences wire...
Electrochemical dissolution is a method in which fluoridated solution direct contact with the fractured instrument receives an electrical current that speeds up fragment dissolution. The aim of this study was to assess integrity dentinal walls during electrochemical rotary endodontic instruments extracted human teeth. Forty-five mandibular incisors subjected process using fluoride low NaCl concentration (LC group: NaF 12 g/L + 1 g/L, pH = 5.0), saturating (SC 180 5.0) and distilled water...
The objective of this study was to evaluate the morphology decellularized and/or cryopreserved porcine pulmonary valves, determine a solution capable completely remove cells without damaging extracellular matrix. Porcine valves were incubated for 24 hs in sodium deoxicholate 1% or dodecyl sulfate 0.1 and 0.3%, with associated cryopreservation. Evaluation done optical microscopy (Hematoxilin-Eosin, Acetic Orcein Gomori) morphometric analysis. effectiveness solutions variable, but best results...
To compare the dissolution time of two solutions, a fluoride solution and sodium hypochlorite solution, both saturated with chloride, during electrochemical instruments consisting conventional nickel-titanium alloy Gold thermomechanically treated alloy.Two an NaF 12 g L-1 180 NaCl NaOCl 2.5% NaCl, were evaluated in polarization test sample 48 ProTaper Universal F1 (PTU F1) WaveOne Small (WOGS) instruments. The electric potentials 0.5 V 5 for respectively. cell consisted three electrodes PTU...
Abstract In this study, the influence of Al2O3 particle amounts on mechanical, tribological, and corrosion properties composite NiP-Al2O3 coating was evaluated. AISI 4140 steel coated with NiP through an autocatalytic bath addition particles maintained in suspension by mechanical stirring. Following, samples were annealed at 600 °C to increase hardness create interdiffusion layer, which improves adhesion resistance. The surface characterized scanning electron microscope...