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Densification in transparent SiO₂ glasses prepared by spark plasma sintering.

ABSTRACT: Recently, spark plasma sintering (SPS) has become an attractive method for the preparation of solid-state ceramics. As SPS is a pressure-assisted low-temperature process, it is important to examine the effects of temperature and pressure on the structural properties of the prepared samples. In the present study, we examined the correlation between the preparation conditions and the physical and structural properties of SiO₂ glasses prepared by SPS. Compared with the conventional SiO₂ glass, the SPS-SiO₂ glasses exhibit a higher density and elastic modulus, but a lower-height first sharp diffraction peak of the X-ray total structure factor. Micro-Raman and micro-IR spectra suggest the formation of heterogeneous regions at the interface between the SiO₂ powders and graphite die. Considering the defect formation observed in optical absorption spectra, reduction reaction mainly affects the densification of SPS-SiO₂ glass. Hence, the reaction at the interface is important for tailoring the structure and physical properties of solid-state materials prepared by the SPS technique.

SUBMITTER: Masai H

PROVIDER: S-EPMC9427799 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature

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Densification in transparent SiO<sub>2</sub> glasses prepared by spark plasma sintering.

Masai Hirokazu H Kimura Hiromi H Kitamura Naoyuki N Ikemoto Yuka Y Kohara Shinji S Masuno Atsunobu A Fujii Yasuhiro Y Miyazaki Takamichi T Yanagida Takayuki T

Scientific reports 20220830 1

Recently, spark plasma sintering (SPS) has become an attractive method for the preparation of solid-state ceramics. As SPS is a pressure-assisted low-temperature process, it is important to examine the effects of temperature and pressure on the structural properties of the prepared samples. In the present study, we examined the correlation between the preparation conditions and the physical and structural properties of SiO<sub>2</sub> glasses prepared by SPS. Compared with the conventional SiO<s ...[more]

PMID: 36042246

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Project description:The bimodal-grain-size 7075 aluminium alloys containing varied ratios of large and small 7075 aluminium powders were prepared by spark plasma sintering (SPS). The large powder was 100 ± 15 ?m in diameter and the small one was 10 ± 5 ?m in diameter. The 7075 aluminium alloys was completely densified under the 500 °C sintering temperature and 60 MPa pressure. The large powders constituted coarse grain zone, and the small powders constituted fine grain zone in sintered 7075 aluminium alloys. The microstructural and microchemical difference between the large and small powders was remained in coarse and fine grain zones in bulk alloys after SPS sintering, which allowed for us to investigate the effects of microstructure and microchemistry on passive properties of oxide film formed on sintered alloys. The average diameter of intermetallic phases was 201.3 nm in coarse grain zone, while its vale was 79.8 nm in fine grain zone. The alloying element content in intermetallic phases in coarse grain zone was 33% to 48% higher than that on fine grain zone. The alloying element depletion zone surrounding intermetallic phases in coarse grain zone showed a bigger width and a more severe element depletion. The coarse grain zone in alloys showed a bigger electrochemical heterogeneity as compared to fine grain zone. The passive film formed on coarse grain zone had a thicker thickness and a point defect density of 2.4 × 1024 m-3, and the film on fine grain zone had a thinner thickness and a point defect density of 4.0 × 1023 m-3. The film resistance was 3.25 × 105 ?cm2 on coarse grain zone, while it was 6.46 × 105 ?cm2 on fine grain zone. The passive potential range of sintered alloys increased from 457 mV to 678 mV, while the corrosion current density decreased from 8.59 × 10-7 A/cm2 to 6.78 × 10-7 A/cm2 as fine grain zone increasing from 0% to 100%, which implied that the corrosion resistance of alloys increased with the increasing content of fine grains. The passive film on coarse grain zone exhibited bigger corrosion cavities after pitting initiation compared to that on fine grain zone. The passive film formed on fine grain zone showed a better corrosion resistance. The protectiveness of passive film was mainly determined by defect density rather than the thickness in this work.

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Densification in transparent SiO₂ glasses prepared by spark plasma sintering.

Publications

Densification in transparent SiO<sub>2</sub> glasses prepared by spark plasma sintering.

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Densification in transparent SiO2 glasses prepared by spark plasma sintering.

Publications

Densification in transparent SiO<sub>2</sub> glasses prepared by spark plasma sintering.

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OmicsDI is part of the ELIXIR infrastructure

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Densification in transparent SiO₂ glasses prepared by spark plasma sintering.