Effect of sintering time on the microstructure and stability of Al2O3–ZrO2 composite powders under microwave-assisted sintering

Huang, Wenlang; Zhang, Yanqiong; Lu, Jiajia; Gao, Lei; Zhang, Fan; Chen, Jin; Omran, Mamdouh; Chen, Guo

doi:10.1016/j.ceramint.2022.11.054

Cited by 14 publications

(3 citation statements)

References 38 publications

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“…The critical stress intensity factor (SIF), K Ic , is a measure of fracture toughness of material and allows for characterizing its propensity to brittle fracture due to the nucleation and propagation of cracks [13,19,21,22,24]. According to our previous works [25,27], the following formula developed by Anstis G.R.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, many research laboratories are working on the development and improvement of reliable materials for SOFCs as well as on the SOFC design [6][7][8][9][10][11][12]. Along with solid electrolyte and cathode materials [6,10,11,[13][14][15][16][17][18][19][20][21][22][23][24][25], great attention is paid to SOFC anode materials [8,12,[26][27][28][29]. It is known that fuel loss may occur during operation of a SOFC which usually leads to re-oxidation of the nickel-containing…”

Section: Introduction 1importance Of Studying Electrodes Of Solid Oxi...mentioning

confidence: 99%

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RETRACTED: The Effect of Treatment Temperature on Microstructure and Mechanical Behavior of a Fine-Grained YSZ–NiO(Ni) Anode Material

et al. 2023

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Reduction–oxidation (redox) cycling of a solid oxide fuel cell (SOFC) due to leakage of a fuel or standby and shutdown cycling is an issue that has attracted the attention of many research groups for a long time. The researchers mainly note the harmful effects of redox cycling on the microstructure of SOFC constituents and search for ways to mitigate or diminish them. The purpose of this study was to use reduction and oxidation stages in an appropriate mode as a positive preconditioning to improve redox cycling stability of Ni-containing SOFC anode materials. The redox treatment was applied to YSZ–NiO(Ni) anode substrate specimens at 600 °C and 800 °C. The mechanical tests (flexural strength, microhardness, and fracture toughness) were performed on these specimens and the results were compared to those for as-sintered and one-time reduced specimens. Microstructure and fracture surface morphology of material in corresponding modes were analyzed. The main findings were summarized as follows: (i) Redox treatment at 600 °C provides an increase in flexural strength and electrical conductivity of YSZ–NiO(Ni) anode cermets; (ii) the treatment at 800 °C causes formation of a gradient microstructure with lateral cracks that result in a significant decrease in flexural strength; (iii) the mode of redox treatment at 600 °C for 4 h in Ar–5% H2/air atmosphere provides an increase in flexural strength of YSZ–NiO(Ni) anode cermets (up to 127 ± 4 MPa), while electrical conductivity was provided at a comparatively high level (7 × 105 S/m).

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Section: Methodsmentioning

confidence: 99%

Section: Introduction 1importance Of Studying Electrodes Of Solid Oxi...mentioning

confidence: 99%

RETRACTED: The Effect of Treatment Temperature on Microstructure and Mechanical Behavior of a Fine-Grained YSZ–NiO(Ni) Anode Material

et al. 2023

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“…The formation of cracks in ceramic and cermet coatings after exposure to high temperatures was reported in other studies in the literature [12,15,31,32]. In addition to this, cracking was linked to stress generated between materials with dissimilar CTE values [18,33]. Therefore, the cause for the development of cracks was attributed to the thermal expansion mismatch between the coating and substrate materials, which resulted in the formation of stresses responsible for inducing the cracking.…”

Section: Analysis Of Coating Failurementioning

confidence: 61%

Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg

Alparone,

Penney,

Sullivan

et al. 2024

Coatings

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The production and quality of automotive-grade galvanised steel are affected by the limited service life of the pot roll bearings used in continuous galvanising lines. The journal bearings are subjected to severe degradation as they react with the molten Zn bath, and coatings can provide corrosion protection to the bearing materials. This research investigates the performance of Al2O3 coatings applied via the HVOF thermal spray process to stainless steel 316L substrates. Immersion tests were conducted in baths of different compositions, namely GI (Zn-0.3 wt.% Al) and ZMA (Zn-1.5 wt.% Al-1.5 wt.% Mg). Material characterisation after testing showed evidence of coating degradation after 1 week, as the coating tended to crack and detach from the substrate, allowing the molten Zn to attack the underlying steel. The coefficient of thermal expansion of Al2O3 and steel was measured, and a difference of 13 × 10−6 K−1 was found, leading to the development of cracks in the coatings. Zn penetration through cracks was determined to be the main failure mechanism of the Al2O3 coatings, which otherwise remained inert to Zn-Al. Conversely, the coatings immersed in Zn-Al-Mg reacted with the Mg in the molten metal bath, showing that changing bath composition affected the performance of the coatings in molten Zn alloy.

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Study of the Role of Alloying Elements Cr, Ni, and Al in the Improvement of High-Temperature (700–800 °C) Fracture Toughness of Ti-Based Composites

Vasyliv,

Kulyk,

Duriagina

et al. 2023

Springer Proceedings in Physics

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Effect of sintering time on the microstructure and stability of Al2O3–ZrO2 composite powders under microwave-assisted sintering

Cited by 14 publications

References 38 publications

RETRACTED: The Effect of Treatment Temperature on Microstructure and Mechanical Behavior of a Fine-Grained YSZ–NiO(Ni) Anode Material

RETRACTED: The Effect of Treatment Temperature on Microstructure and Mechanical Behavior of a Fine-Grained YSZ–NiO(Ni) Anode Material

Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg

Study of the Role of Alloying Elements Cr, Ni, and Al in the Improvement of High-Temperature (700–800 °C) Fracture Toughness of Ti-Based Composites

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