Microwave sintering of plasma-sprayed yttria stabilized zirconia electrolyte coating

Zhang, Chao; Zhang, Ga; Leparoux, Susanne; Liao, Hanlin; Li, Cheng‐Xin; Coddet, C.

doi:10.1016/j.jeurceramsoc.2008.03.040

Cited by 12 publications

(3 citation statements)

References 28 publications

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“… 16 , 17 In addition, various post-processing treatments are also utilized for enhancing the corrosion resistance of thermal spray coatings by eliminating its inherent defects. These include furnace heating, 18 − 20 microwave sintering, 21 laser treatment, 22 − 24 plasma treatment, 25 and thermo-mechanical techniques, such as friction stir processing (FSP). 26 , 27 High-temperature furnace annealing has problems associated with oxidation, while low-temperature heating for longer times can deteriorate the mechanical properties of the substrate through grain growth.…”

Section: Introductionmentioning

confidence: 99%

“…Further, the disposal of epoxy resins is also difficult due to their stable network structures and generally results in byproducts containing toxic molecules, which are difficult to be separated and reutilized. , In addition, various post-processing treatments are also utilized for enhancing the corrosion resistance of thermal spray coatings by eliminating its inherent defects. These include furnace heating, − microwave sintering, laser treatment, − plasma treatment, and thermo-mechanical techniques, such as friction stir processing (FSP). , High-temperature furnace annealing has problems associated with oxidation, while low-temperature heating for longer times can deteriorate the mechanical properties of the substrate through grain growth . Laser and plasma heat treatments require highly specialized equipment with huge capital investments, which limits their practical applications.…”

Section: Introductionmentioning

confidence: 99%

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Facile and Green Engineering Approach for Enhanced Corrosion Resistance of Ni–Cr–Al₂O₃ Thermal Spray Coatings

et al. 2020

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Thermal spray coatings (TSCs) are widely utilized for limiting degradation of structural components. However, the performance of TSCs is significantly impaired by its inherent non-homogeneous microstructure, comprising of splat boundaries, porosities, secondary phase-formation, and elemental segregation. Herein, we report a simplistic approach for significantly enhancing the corrosion resistance of TSCs. Ni–Cr–5Al 2 O 3 coatings were deposited on stainless steel using high-velocity oxy-fuel technique. The microstructure of as-sprayed coating showed significant inhomogeneities in the form of isolated splats and elemental segregation. The microstructure of developed coatings was modified using a novel processing technique, known as stationary friction processing (SFP). The SFP treatment resulted in complete refinement of coating microstructure with elimination of splat boundaries and pores along with elemental homogenization. The corrosion behavior of as-sprayed and SFP treated coating was evaluated in 3.5% NaCl solution using potentiodynamic polarization and electrochemical impedance spectroscopy. The SFP treatment reduced the corrosion rate of as-sprayed coating by an order of magnitude. Long-time immersion studies showed continuously decreasing impedance of the as-sprayed coating due to the penetration of the electrolyte along the splat boundaries. In contrast, impedance for the SFP treated coating increased with the immersion time due to the removal of all microstructural defects.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile and Green Engineering Approach for Enhanced Corrosion Resistance of Ni–Cr–Al₂O₃ Thermal Spray Coatings

et al. 2020

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“…In this area, several groups have used MW methods to prepare (sinter) oxide ion conducting pellets for use as solid electrolytes, including yttria-stabilized zirconia (YSZ), the most commonly employed electrolyte in SOCs. When MW-prepared using a multimode MW furnace at 2.45 GHz, the sintering temperature of YSZ was shown to be lowered by ca. 100 °C compared to that in conventional sintering methods and a finer grain size was also produced .…”

Section: Introductionmentioning

confidence: 99%

Rapid and Low-Energy Fabrication of Symmetrical Solid Oxide Cells by Microwave Methods

2017

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Solid oxide fuel cells are highly efficient, low-emission, and fuel-flexible energy conversion devices that can also run in reverse as solid oxide electrolysis cells, converting CO 2 and/or H 2 O to useful fuels and pure O 2 . Our team has recently developed a highly promising mixed conducting oxide catalyst (La 0.3 Ca 0.7 Fe 0.7 Cr 0.3 O 3−δ ) that can be used at both the anode and cathode in either the fuel cell or electrolysis mode in a lower-cost symmetrical cell. However, there is still a need to improve material processing and cell manufacturing methods in this field. Here, we report, for the first time, fabrication of a symmetrical solid oxide cell, based on our very promising catalysts, using rapid, low-cost, low-energy, and green microwave (MW) processing techniques. These cells were fabricated with MW-sintered powders and were then MW-sintered without the use of any MW susceptors inside the electrode layers or any additional presintering steps. The catalyst layers show very stable nanostructures and do not delaminate, and the cells exhibit reaction rates that are similar to those obtained using normal ceramic processing methods. Importantly, the powder preparation and cell sintering steps, carried out using MW methods, require only ca. 1/3 and 1/9 of the time/energy, respectively, versus those required in traditional furnace methods, thus translating to significant cost savings.

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Electric Field and Current Effects on Sintering

2012

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Microwave sintering of plasma-sprayed yttria stabilized zirconia electrolyte coating

Cited by 12 publications

References 28 publications

Facile and Green Engineering Approach for Enhanced Corrosion Resistance of Ni–Cr–Al₂O₃ Thermal Spray Coatings

Facile and Green Engineering Approach for Enhanced Corrosion Resistance of Ni–Cr–Al₂O₃ Thermal Spray Coatings

Rapid and Low-Energy Fabrication of Symmetrical Solid Oxide Cells by Microwave Methods

Electric Field and Current Effects on Sintering

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Microwave sintering of plasma-sprayed yttria stabilized zirconia electrolyte coating

Cited by 12 publications

References 28 publications

Facile and Green Engineering Approach for Enhanced Corrosion Resistance of Ni–Cr–Al2O3 Thermal Spray Coatings

Facile and Green Engineering Approach for Enhanced Corrosion Resistance of Ni–Cr–Al2O3 Thermal Spray Coatings

Rapid and Low-Energy Fabrication of Symmetrical Solid Oxide Cells by Microwave Methods

Electric Field and Current Effects on Sintering

Contact Info

Product

Resources

About

Facile and Green Engineering Approach for Enhanced Corrosion Resistance of Ni–Cr–Al₂O₃ Thermal Spray Coatings

Facile and Green Engineering Approach for Enhanced Corrosion Resistance of Ni–Cr–Al₂O₃ Thermal Spray Coatings