A5004818156- Advanced materials and composites
- Injection Molding Process and Properties
- Advanced ceramic materials synthesis
- Thermal Expansion and Ionic Conductivity
- Additive Manufacturing and 3D Printing Technologies
- Recycling and utilization of industrial and municipal waste in materials production
- Ferroelectric and Piezoelectric Materials
- High-pressure geophysics and materials
- Nuclear materials and radiation effects
- Pigment Synthesis and Properties
- Powder Metallurgy Techniques and Materials
- Boron and Carbon Nanomaterials Research
- Diamond and Carbon-based Materials Research
- Concrete and Cement Materials Research
- Thermal and Kinetic Analysis
- Aluminum Alloys Composites Properties
- Metal and Thin Film Mechanics
- Glass properties and applications
- biodegradable polymer synthesis and properties
- MXene and MAX Phase Materials
- Dental Radiography and Imaging
- Advanced machining processes and optimization
- Microwave Dielectric Ceramics Synthesis
- Advanced Battery Materials and Technologies
- Polymer Foaming and Composites
Instituto Federal Farroupilha
2025
Universidade de Caxias do Sul
2015-2024
Universidade Federal do Rio Grande do Sul
1993-2008
Nortel (Canada)
1997
Abstract The development of functional compounds for extrusion applied in the additive manufacturing anthropomorphic simulators is interesting, as it guarantees manufacture a 3D model similar to patient. These find applications therapies or laboratory tests involving x‐rays. In order replicate human conditions these tests, essential create materials that closely match properties tissue, including smoothness soft tissues and hardness bone tissue. This study developed ceramic‐polymeric...
The high-pressure behavior of the Prussian Blue analogue $\mathrm{Fe}[\mathrm{Co}{(\mathrm{C}\mathrm{N})}_{6}]$ has been explored by energy- and angle-dispersive x-ray diffraction, Fourier transform infrared, Raman spectroscopy. This cyanide-bridged framework material becomes amorphous above $10\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ form is retained upon pressure release. Samples recovered from around $17\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ exhibit a dark, metallic luster their spectra...
Injection molding has important advantages over other methods for the production of advanced ceramic parts with complex shapes. In this work, low‐pressure injection was used to produce helical springs using two different kinds molds. The powders were submicrometer‐sized alumina and partially stabilized zirconia. Sintered zirconia obtained free defects, densities from 96% 99% theoretical value. preliminary mechanical tests, these supported axial deformations up 10% before failure.
Abstract Background The use of panoramic radiography (PR) is a complementary examination to aid in the diagnosis cases paediatric dentistry. lack specific protocols for these devices, however, can result high doses radiation, affecting critical organs such as thyroid. Aim To evaluate discrepancies ionizing radiation received by thyroid during PR examinations using anthropomorphic simulators built from computed tomography images. Design Two phantoms were printed and used, representing...
Zirconium tungstate (α‐ZrW 2 O 8 ) exhibits isotropic negative thermal expansion over a wide range of temperatures. Under high pressure it transforms to metastable amorphous phase with positive coefficient. α‐ZrW can be fully recovered by annealing the at temperatures slightly above 600°C, room pressure. In this work, we describe dependency linear coefficient ZrW temperature, showing that continuously tuned, in two stages, from about 7.5° −9°C −1 . These stages are related relaxation and...
The structure of $\ensuremath{\gamma}\text{\ensuremath{-}}\mathrm{Zr}{\mathrm{W}}_{2}{\mathrm{O}}_{8}$ has been optimized at zero pressure and also $V∕{V}_{0}=0.97$ by means density functional theory calculations using the B3LYP functional. As previously found for $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Zr}{\mathrm{W}}_{2}{\mathrm{O}}_{8}$, tungsten polyhedra are stiffer than zirconium octahedra in...
Low‐pressure injection molding ( LPIM ) was used to produce helical alumina springs. Three sets of springs were sintered at 1550°C, 1600°C and 1650°C observe the effects on spring constant fracture stress. Sintered obtained with densities ranging from 94.0% 97.5% theoretical limit. Spring constants measured room temperature up 1100°C. Fracture stress data analyzed according W eibull statistics method maximum likelihood. Upon increase sintering 1550°C 1650°C, characteristic strength increases...
All-electron density functional theory calculations were performed aiming to determine the equation of state and dependence with pressure $c/a$ ratio anisotropic compressibility for hexagonal-close-packed rhenium. Calculations carried out up maximum compression 0.46, resulting total energy versus volume is well described by a Vinet ${B}_{0}$ = 367(5) GPa ${B}_{0}^{\ensuremath{'}}$ 4.64(3), valid 1.5 TPa. The agreement two recent experimental studies [S. Anzellini et al., Equation rhenium...
The crystallisation kinetics of magnetite from basalt glass was studied using samples prepared by melting basaltic rocks the Serra Geral Formation, without addition nucleating agent, differential scanning calorimetry under isothermal conditions. temperature maximum nucleation rate for determined as 650 [Formula: see text]C. Upon further heating to 860 text]C, a second phase crystallises, which identified X-ray diffraction pyroxene (augite, Ca(Mg,Fe)Si[Formula: text]O[Formula: text]). best...
Ti6Al4V used in biomedical applications still has several surface-related problems, such as poor bone compatibility and low wear resistance. In this work, the formation of a protective layer titanium nitride obtained by plasma treatment hollow cathode was studied, best experimental conditions were verified statistical factorial design experiments. The samples characterized terms their physical chemical properties, correlating effects time (min) temperature (°C). An achieved ideal condition...
This work explores the stabilization effect of a sulfonated tannin (black wattle extract) on water-suspended α-alumina particles. Results showed that first additions lead to particle agglomeration. A minimum 0.5 wt% (relative alumina content) is required cover whole surface. Suspensions regain stability at ca. 1.0 (ca.1 mg tannin/m2 surface area), due high negative ζ-potential (−60 mV, pH = 8.0). Both and hydrodynamic diameter are then close those in electrostatically dispersed Changes ionic...