Analyzing coarsening versus densification phenomenon present in partial sintering of Al2O3/TiO2 composites

Aragão, Victor Teixeira da Silva; Silva, Vanessa Santana; Carvalho, Rafael Rabelo de; Matos, Robert Saraiva; Ferreira, Nilson S.; Melo, Dulce Maria de Araújo; Oliveira, Rosane Maria Pessoa Betânio

doi:10.1016/j.jmrt.2021.09.112

Cited by 8 publications

(2 citation statements)

References 60 publications

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“…This positive gain in the hardness of composites is exhibited due to improved diffusion phenomena at large time intervals [33,34]. Further, the maximum hardness is achieved at a holding time of 10 min, and beyond this, there is a decline in hardness value; it would be due to grain coarsening that started to take place for a longer duration of sintering time [35]. Sintering pressure also caused to increase in the hardness of the AMCs.…”

Section: Rockwell Hardnessmentioning

confidence: 96%

Electric Resistance Sintering of Al-TiO2-Gr Hybrid Composites and Its Characterization

et al. 2022

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In the present work, Al-TiO2-Gr hybrid composites were fabricated through a sustainable manufacturing approach, i.e., ERS (Electric Resistance Sintering) technique. In this experimental work, sintering is performed in a high-density graphite die, which also works as a heating element. The green compacts kept in the graphite die are sintered in two ways simultaneously (conduction and resistance heating). This facilitated the accomplishment of the sintering at a lower current (300–500 A). The aluminum (Al) was reinforced with 9 wt. % TiO2 (rutile) nanoparticles and 3 wt. % graphite microparticles to synthesize a self-lubricated high wear resistance material. Mechanical properties such as density, hardness, and wear loss of the Al-TiO2-Gr hybrid composite were investigated. Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were performed for microstructural investigation. The experiments were performed according to the Taguchi design of the experiment, where three input process parameters (temperature, holding time, and sintering load) were taken to fabricate the Al-TiO2-Gr composite. The sintering temperature of 550 °C resulted in the maximum value of mean sintered density (approx. 2.45 gm/cm3). The holding time of 10 min for the sintering resulted in the maximum value of mean sintered density and mean hardness (HRB 53.5). The mean value of wear loss was found to be minimum for the composites sintered at 600 °C for 10 min. The maximum value of the sintering load (800 N) revealed better density and hardness. Worn surfaces and wear debris were also analyzed with the help of SEM images. The sintering temperature of 600 °C resulted in imparting more wear resistance which was proved by smooth surfaces, micro-cutting, and fewer crates, grooves, and smaller pits.

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Section: Rockwell Hardnessmentioning

confidence: 96%

Electric Resistance Sintering of Al-TiO2-Gr Hybrid Composites and Its Characterization

et al. 2022

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“…With the development of the fabrication method such as the 3D printing [10], sacrificial pore-forming agents [11] and partial sintering strategy [12], tremendous interest has gained in the porous Al 2 O 3 fields. Due to the unique characteristics like high energy absorption capacity, low thermal conductivity and density, the porous Al 2 O 3 has been widely used in many engineering structures to meet the requirements of the corresponding applications [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Tunable deformation design of porous Al₂O₃ based on the Direct FE² method

Zhao,

Liu,

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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The tunable deformation design of porous ceramics has raised many interests in many engineering and manufacturing fields, where its corresponding design methodologies still suffer from the lower efficiency and higher computational cost. To handle this problem, a novel optimization and design methodology based on the Direct FE2 method has been proposed in this study, and several numerical examples of the porous Al2O3 tunable deformation design has been performed by this novel methodology. Compared with the traditional methodologies, the proposed method is more convenient to conduct the tunable deformation design and improves the optimization efficiency. Based on this method, the distribution and assembly of the microscale RVE could be tailored along the space dimension to handle the sinusoidal deformation and variable Poisson’s ratio ceramic design at the macroscale. By comparing the simulation results with the Direct Numerical Simulation (DNS) model, the effectiveness and accuracy of this methodology is well validated. Meanwhile, the simulation results based on the proposed methodology found that the predictability of porous Al2O3 deformation could be enhanced by changing the micro structure parameters such as the elliptical hole angle and aspect ratio. This methodology holds great potential for applications in the design and optimization of porous ceramics with tailored deformation characteristics.

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Characterization of 3Y-TZP/TiO2 hybrid experimental dental ceramics

Miranda

Ussui

Lazar

et al. 2023

Ceramics International

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Analyzing coarsening versus densification phenomenon present in partial sintering of Al2O3/TiO2 composites

Cited by 8 publications

References 60 publications

Electric Resistance Sintering of Al-TiO2-Gr Hybrid Composites and Its Characterization

Electric Resistance Sintering of Al-TiO2-Gr Hybrid Composites and Its Characterization

Tunable deformation design of porous Al₂O₃ based on the Direct FE² method

Characterization of 3Y-TZP/TiO2 hybrid experimental dental ceramics

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Analyzing coarsening versus densification phenomenon present in partial sintering of Al2O3/TiO2 composites

Cited by 8 publications

References 60 publications

Electric Resistance Sintering of Al-TiO2-Gr Hybrid Composites and Its Characterization

Electric Resistance Sintering of Al-TiO2-Gr Hybrid Composites and Its Characterization

Tunable deformation design of porous Al2O3 based on the Direct FE2 method

Characterization of 3Y-TZP/TiO2 hybrid experimental dental ceramics

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Product

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Tunable deformation design of porous Al₂O₃ based on the Direct FE² method