The enhanced thermal shock resistance and combustion efficiency of SiC reticulated porous ceramics via the construction of multi-layer coating

Liang, Xiong; Wan, Fang‐Hao; Li, Yawei; Pan, Liping; Wang, Qinghua; Yan, Weiping; Xu, Yong; Yang, Ziqiang; Li, Chenhui

doi:10.1016/j.ceramint.2022.11.068

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…SiC‐based refractories were widely used in incinerators owing to excellent molten metal/slag resistance, light weight, and high‐temperature properties 1–6 . However, hot water vapor followed by garbage incineration would seriously corrode the SiC‐based materials 7–10 . Rare earth silicates Yb 2 Si 2 O 7 and Lu 2 Si 2 O 7 had excellent chemical stability even in 1300°C water vapor atmosphere 11,12 .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6] However, hot water vapor followed by garbage incineration would seriously corrode the SiC-based materials. [7][8][9][10] Rare earth silicates Yb 2 Si 2 O 7 and Lu 2 Si 2 O 7 had excellent chemical stability even in 1300 • C water vapor atmosphere. 11,12 In aerospace, researchers usually prepare rare-earth silicate environmental barrier coatings (EBCs) on the surface of silicon carbide ceramic matrix composites (CMC-SiC) against hot water vapor corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb₂Si₂O₇ bonding phase

Zhang,

Chen,

Xue

et al. 2024

Int J Applied Ceramic Tech

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SiC‐based lining refractories used in incinerators faced serious hot water vapor corrosion. The pores in SiC‐based refractories played a crucial role in corrosion resistance because both the penetration of water vapor and the expulsion of corrosion products depended on diffusion channels provided by pores. The in situ microporous Yb2Si2O7 bonding phase formed in the SiC bricks after sintering at 1550°C under air atmosphere, which simultaneously decreased the apparent porosity and pore size. The optimization of pore structures reduced the permeability to gases of SiC bricks by 37.5%, which prevented the penetration of hot water vapor into SiC bricks. The microporous Yb2Si2O7‐bonded SiC bricks presented only .15% permanent linear change and showed good thermal shock resistance after corrosion at 1000°C for 100 h under hot water vapor atmosphere. Some SiC particles in the refractories could be adopted as high‐temperature pore‐forming agents; the gaseous oxidation products of SiC bricks, including SiO(g) and CO(g), contributed to the generation of microporous Yb2Si2O7 (pore size ≤5 μm) and SiC whiskers during sintering, which obviously improved mechanical properties and water vapor corrosion resistance of SiC bricks.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb₂Si₂O₇ bonding phase

Zhang,

Chen,

Xue

et al. 2024

Int J Applied Ceramic Tech

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“…Multilayer coatings are being investigated on SiC foams as a way to increase the resistance of the material to thermal shock. By coating the surface with cordierite, the combustion efficiency is increased, resulting in significantly reduced CO and NO x emissions [12]. Additionally, SiC 3D printing is an emerging technology that can be exploited, as the printing of complex geometries of SiC structures for demanding applications is currently commercially feasible [13].…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of a Novel Foam Burner Design for the Low-Excess-Enthalpy Combustion of Very Lean Syngas Mixtures

Fotiadis,

Asimakopoulou,

Baltzopoulou

et al. 2023

Energies

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In the present work, a novel foam burner design is proposed and experimentally evaluated for operation with highly diluted syngas mixtures. The lab-scale burner consists of a purpose-built, square-shaped, high-temperature-grade stainless steel tubular reactor filled with square-sectioned siliconized silico carbide (SiSiC) foams. The assembly was installed in an electrical furnace. Spatially resolved temperature measurements were obtained along the reactor axis, while simultaneous measurements of CO, CO2, H2, O2, and N2 were taken at the burner exit and the water levels were recorded upstream and downstream of the reactor. The results clearly show that flames can be stabilized along the reactor for a range of foam characteristics and operating conditions. Hydrogen conversion efficiencies in excess of 98%, and overall thermal efficiencies close to 95% were achieved for the selected operating conditions. Overall, the denser 10 ppi foam demonstrated superior combustion characteristics in terms of stability, lower enthalpy rises, and a wider operating range at the expense of a very modest pressure drop penalty. Finally, scanning electron microscopy, coupled with energy dispersion spectroscopy (SEM/EDS) and Raman spectroscopy analyses, was used to determine the morphological and compositional characteristics of the pristine and aged foams. After more than 100 h of operation, no significant performance degradation was observed, even though the burner design was subjected to considerable thermal stress.

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“…Due to intrinsic high specific surface area, low relative density, and stability of cellular ceramics, they have been used as molten metal filters, catalyst supports, combustors, etc. [1][2][3][4]. Therefore, open-cell ceramic foams are the most applied filters for ferrous and nonferrous metal-making industries, which favor collision and capture of nonmetallic inclusions as well as the adjustment of flow turbulence for reducing re-oxidation and cavity formation.…”

Section: Introduction mentioning

confidence: 99%

Tensile strength and damage of open-cell ceramic foams under cylindrical splitting test

Dai,

Hubálková,

Voigt

et al. 2023

Journal of Advanced Ceramics

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To widen the understanding of tensile failure of reticulated ceramic foams and expand the available mechanical method, a cylindrical splitting test is developed in the present study based on alumina open-cell foams of three different pore densities. The biaxial method is validated by characterization of mechanical parameters, and the in-situ fracture process is validated by a digital image correlation, followed by a formula correction for effective tensile strength with consideration of discrete crack paths. For experimental setup curved loading platens, compliant pad and intermediate quasi-static loading rate are proposed for guaranteeing tensile failure under a radial compressive load. Tensile strength, fracture energy, and brittleness increase with the foam pore density, and the fracture behavior is a balanced result of materials and foam structural support strength. An analytical model of splitting tensile strength with structural parameters is derived, which implies its dependence on cell size and critical stress intensity factor of strut materials.

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The enhanced thermal shock resistance and combustion efficiency of SiC reticulated porous ceramics via the construction of multi-layer coating

Cited by 10 publications

References 24 publications

Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb₂Si₂O₇ bonding phase

Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb₂Si₂O₇ bonding phase

Experimental Characterization of a Novel Foam Burner Design for the Low-Excess-Enthalpy Combustion of Very Lean Syngas Mixtures

Tensile strength and damage of open-cell ceramic foams under cylindrical splitting test

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The enhanced thermal shock resistance and combustion efficiency of SiC reticulated porous ceramics via the construction of multi-layer coating

Cited by 10 publications

References 24 publications

Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb2Si2O7 bonding phase

Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb2Si2O7 bonding phase

Experimental Characterization of a Novel Foam Burner Design for the Low-Excess-Enthalpy Combustion of Very Lean Syngas Mixtures

Tensile strength and damage of open-cell ceramic foams under cylindrical splitting test

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Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb₂Si₂O₇ bonding phase

Improved water vapor corrosion resistance of SiC bricks via in situ formation of microporous Yb₂Si₂O₇ bonding phase