Pressureless flash sintering of α-SiC: Electrical characteristics and densification

Gibson, A. A. M.; Li, Yinsheng; Todd, Richard I.

doi:10.1016/j.actamat.2022.118362

Cited by 19 publications

(5 citation statements)

References 45 publications

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“…In addition to the thermochemical loss of SiC, non‐stacking nature is also an important factor that SiC cannot form coating with SAPS. Many studies have suggested that SiC was difficult to sinter at high temperatures with very low sintering self‐diffusion coefficients 44–46 . The self‐diffusion coefficients of SiC and SiO 2 are 1.4 × 10 −9 and 3.8 × 10 −5 cm 2 /s, respectively 47,48 .…”

Section: Resultsmentioning

confidence: 99%

“…Many studies have suggested that SiC was difficult to sinter at high temperatures with very low sintering self-diffusion coefficients. [44][45][46] The selfdiffusion coefficients of SiC and SiO 2 are 1.4 × 10 −9 and 3.8 × 10 −5 cm 2 /s, respectively. 47,48 The connection details of two SiC particles are depicted in Figure 15.…”

Section: Deposition Mechanism Of Sic Particlesmentioning

confidence: 99%

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Deposition behavior and mechanism of thermal sprayed SiC

Liu,

Li,

Guo

et al. 2023

J Am Ceram Soc.

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It is widely known that silicon carbide (SiC) is challenging to thermal spray. However, the nature of deposition and the underlying mechanisms are still not clearly understood. In the current work, the process of atmospheric plasma‐sprayed SiC was investigated in detail. SiC exhibits sublimation severely under the plasma spraying (PS). More than 65 mol.% SiC particles lost by sublimation during PS estimated by calculation. Due to the nonuniformity of temperature in plasma flame, a small amount of SiC particles was retained. Moreover, a small amount of Si and SiO2 was experimentally observed after deposition process from the single‐splat characterization. According to the first‐principles calculations, the detachment energy of C atom from the lattice (0.591 eV) is lower than that of Si atom (1.257 eV). The adsorption energies of an O atom on the Si‐ and C‐terminated surfaces are −9.549 and −7.631 eV, respectively. Therefore, C is more likely to form gaseous products after decomposition, and Si is more likely to be retained to form Si and SiO2. Mullite was found on the grain boundaries of molten Si, which was attributed to the rapid diffusion of the Al2O3 substrate along the grain boundaries of Si, promoting the spreading of molten splats. It is difficult to stack particles through self‐diffusion among SiC particles to form coatings. The discovery on thermal deposition mechanism of SiC in PS is helpful to promote the practical application of SiC coatings on preparation optimization and interfacial bonding improvement.

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Section: Resultsmentioning

confidence: 99%

Section: Deposition Mechanism Of Sic Particlesmentioning

confidence: 99%

Deposition behavior and mechanism of thermal sprayed SiC

Liu,

Li,

Guo

et al. 2023

J Am Ceram Soc.

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“…It is currently utilized in the production of SOFC, solid electrolytes [145,146], polymer-derived ceramic nanocomposites (PDC-NC) [147], thermal barrier coating materials [41,148,149], thermoelectric nanomaterials [150], metal and alloy materials [151], biomaterials [152], and quartz glass [153], etc. FS, with its broad applicability, extends beyond SOFCs and solid electrolytes [154] to include semiconductor materials [55], metalliclike conductors such as borides, nitrides, and carbides of transition metals [113], armor [155,156], biomaterials [157,158], the joining of dissimilar materials [159,160], and nuclear fuel [161][162][163]. Notably, in the nuclear fuel sector, preliminary experiments have demonstrated the capability of FS technology to produce high-density nuclear fuels at significantly lower temperatures than those required for conventional sintering processes [161].…”

Section: Current Progress and Other Applicationsmentioning

confidence: 99%

Innovations in Electric Current-Assisted Sintering for SOFC: A Review of Advances in Flash Sintering and Ultrafast High-Temperature Sintering

Wu,

Gao

et al. 2024

Applied Sciences

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This review discusses the groundbreaking advancements in electric current-assisted sintering techniques, specifically Flash Sintering (FS) and Ultrafast High-Temperature Sintering (UHS), for their application in Solid Oxide Fuel Cells (SOFCs). These innovative sintering methods have demonstrated remarkable potential in enhancing the efficiency and quality of SOFC manufacturing by significantly lowering sintering temperatures and durations, thereby mitigating energy consumption and cost. By providing a detailed overview of the mechanisms, process parameters, and material characteristics associated with FS and UHS, this paper sheds light on their pivotal role in the fabrication of SOFC components such as electrolytes, electrodes, multilayered materials, and interconnect coatings. The advantages, challenges, and prospective opportunities of these sintering technologies in propelling SOFC advancements are thoroughly assessed, underlining their transformative impact on the future of clean and efficient energy production technologies.

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“…It has been demonstrated that FS can be applied to almost all oxides including ionic conductors, electronic conductors, insulators, and multicomponent oxides [5] and even synthesis of complex oxides in seconds by reactive FS is another promising kind of application. [37][38][39] FS of other material classes like nonoxide ceramics like nitrides, [40] carbides, [41][42][43][44][45] and even metals is currently under investigation.…”

Section: Fsmentioning

confidence: 99%

A Perspective on Emerging and Future Sintering Technologies of Ceramic Materials

2023

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Novel sintering methods have emerged in the recent past years, which have raised great interest in the scientific community. Relying on electric field effects, high heating rates, the use of mechanical pressure, or hydrothermal conditions, they offer fundamental advantages compared to conventional sintering routes like minimizing the energy consumption and enhancing the process efficiency. This perspective aims at explaining these effects in a general way and presenting the status quo of using them for the processing of high‐performing ceramic materials. In detail, this work focuses on flash sintering, ultrafast high‐temperature sintering, spark plasma sintering, cold sintering, and photonic sintering methods based on different light sources. The specificities, potentials, and limitations of each method are compared, especially in the light of a possible industrialization.

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Pressureless flash sintering of α-SiC: Electrical characteristics and densification

Cited by 19 publications

References 45 publications

Deposition behavior and mechanism of thermal sprayed SiC

Deposition behavior and mechanism of thermal sprayed SiC

Innovations in Electric Current-Assisted Sintering for SOFC: A Review of Advances in Flash Sintering and Ultrafast High-Temperature Sintering

A Perspective on Emerging and Future Sintering Technologies of Ceramic Materials

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