The Experts below are selected from a list of 14115 Experts worldwide ranked by ideXlab platform
Jürgen Malzbender - One of the best experts on this subject based on the ideXlab platform.
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room and high temperature torsional shear strength of solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the sealant Material is critical for the reliability of solid oxide fuel/electrolysis stacks. In the current study, a torsion test is implemented to evaluate and compare its shear strength with a partially crystallized glass sealant at room- and operation relevant high-temperatures. Hourglass-shaped specimens with different configurations of hollow- and full-halves are utilized for testing. The fracture surfaces are visualized via optical microscopy and complementary scanning electron microscopy. In addition, cyclic loading is used to investigate potential subcritical crack growth effects in the sealants. Both, the specimens with a hollow-half as well as the ones with two full-halve steel plates yield almost the same nominal shear strengths. The shear fracture stresses decrease with rising temperature, while the fracture mode changes from brittle at room temperature and 600 °C to ductile at 800 °C. The cyclic loading condition indicates subcritical crack growth in the sealant at 600 °C and creep associated damage at 800 °C.
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room and high temperature flexural strength of a stable solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the Sealing Material is critical for the reliability of solid oxide fuel/electrolysis stacks. The current work concentrates on microstructural and mechanical aspects of a sealant Material for this application. In particular, the crystallization behavior as a determining factor for the sealants’ mechanical behavior is investigated via high-temperature XRD for 24 h. Furthermore, regarding mechanical properties, three- and four-point bending tests are carried out on sealant bars and head-to-head joined specimens at room- and high-temperatures, yielding in particular relevant fracture stress data. In addition, the elastic modulus is measured by the impulse excitation test from RT to 900 oC. Tests are done for both as-sintered (as-joined) and annealed samples. The main crystallization appears to happen during the initial joining time. The sealant shows a relatively stable flexural strength in terms of temperature dependency as well as effects of the aging process. In fact, the joined specimens reveal a more than 50% lower flexural strength than glass bars at all temperatures. A complementary finite element simulation indicates the presence of a non-negligible thermal residual stress in joined specimens.
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The effect of room temperature and high temperature exposure on the elastic modulus, hardness and fracture toughness of glass ceramic sealants for solid oxide fuel cells
Journal of The European Ceramic Society, 2011Co-Authors: Yilin Zhao, Jürgen Malzbender, Sonja M. GrossAbstract:Abstract The reliable operation of solid oxide fuel cell stacks (SOFCs) depends strongly on the structural integrity of the Sealing Material. Indentation testing is used to determine the mechanical properties of glass-ceramic sealants typically used for solid oxide fuel cell stacks, in particular for the evaluation of elastic modulus, hardness and fracture toughness. Different Sealing Materials partly with reinforcement by metallic or ceramic filler (particles or short fibers) are tested. The Materials are tested after the joining procedure and after additional annealing at operation temperatures to test the effect of further crystallization that might take place. Furthermore, the effect of environmentally enhanced slow crack growth at low temperatures in water saturated atmosphere is investigated. Finally, self-healing effects of the glass ceramic Materials with and without pre-annealing at typical operation temperatures are considered.
Fakouri M Hasanabadi - One of the best experts on this subject based on the ideXlab platform.
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room and high temperature torsional shear strength of solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the sealant Material is critical for the reliability of solid oxide fuel/electrolysis stacks. In the current study, a torsion test is implemented to evaluate and compare its shear strength with a partially crystallized glass sealant at room- and operation relevant high-temperatures. Hourglass-shaped specimens with different configurations of hollow- and full-halves are utilized for testing. The fracture surfaces are visualized via optical microscopy and complementary scanning electron microscopy. In addition, cyclic loading is used to investigate potential subcritical crack growth effects in the sealants. Both, the specimens with a hollow-half as well as the ones with two full-halve steel plates yield almost the same nominal shear strengths. The shear fracture stresses decrease with rising temperature, while the fracture mode changes from brittle at room temperature and 600 °C to ductile at 800 °C. The cyclic loading condition indicates subcritical crack growth in the sealant at 600 °C and creep associated damage at 800 °C.
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room and high temperature flexural strength of a stable solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the Sealing Material is critical for the reliability of solid oxide fuel/electrolysis stacks. The current work concentrates on microstructural and mechanical aspects of a sealant Material for this application. In particular, the crystallization behavior as a determining factor for the sealants’ mechanical behavior is investigated via high-temperature XRD for 24 h. Furthermore, regarding mechanical properties, three- and four-point bending tests are carried out on sealant bars and head-to-head joined specimens at room- and high-temperatures, yielding in particular relevant fracture stress data. In addition, the elastic modulus is measured by the impulse excitation test from RT to 900 oC. Tests are done for both as-sintered (as-joined) and annealed samples. The main crystallization appears to happen during the initial joining time. The sealant shows a relatively stable flexural strength in terms of temperature dependency as well as effects of the aging process. In fact, the joined specimens reveal a more than 50% lower flexural strength than glass bars at all temperatures. A complementary finite element simulation indicates the presence of a non-negligible thermal residual stress in joined specimens.
A H Kokabi - One of the best experts on this subject based on the ideXlab platform.
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room and high temperature torsional shear strength of solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the sealant Material is critical for the reliability of solid oxide fuel/electrolysis stacks. In the current study, a torsion test is implemented to evaluate and compare its shear strength with a partially crystallized glass sealant at room- and operation relevant high-temperatures. Hourglass-shaped specimens with different configurations of hollow- and full-halves are utilized for testing. The fracture surfaces are visualized via optical microscopy and complementary scanning electron microscopy. In addition, cyclic loading is used to investigate potential subcritical crack growth effects in the sealants. Both, the specimens with a hollow-half as well as the ones with two full-halve steel plates yield almost the same nominal shear strengths. The shear fracture stresses decrease with rising temperature, while the fracture mode changes from brittle at room temperature and 600 °C to ductile at 800 °C. The cyclic loading condition indicates subcritical crack growth in the sealant at 600 °C and creep associated damage at 800 °C.
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room and high temperature flexural strength of a stable solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the Sealing Material is critical for the reliability of solid oxide fuel/electrolysis stacks. The current work concentrates on microstructural and mechanical aspects of a sealant Material for this application. In particular, the crystallization behavior as a determining factor for the sealants’ mechanical behavior is investigated via high-temperature XRD for 24 h. Furthermore, regarding mechanical properties, three- and four-point bending tests are carried out on sealant bars and head-to-head joined specimens at room- and high-temperatures, yielding in particular relevant fracture stress data. In addition, the elastic modulus is measured by the impulse excitation test from RT to 900 oC. Tests are done for both as-sintered (as-joined) and annealed samples. The main crystallization appears to happen during the initial joining time. The sealant shows a relatively stable flexural strength in terms of temperature dependency as well as effects of the aging process. In fact, the joined specimens reveal a more than 50% lower flexural strength than glass bars at all temperatures. A complementary finite element simulation indicates the presence of a non-negligible thermal residual stress in joined specimens.
S M Grosbarsnick - One of the best experts on this subject based on the ideXlab platform.
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room and high temperature torsional shear strength of solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the sealant Material is critical for the reliability of solid oxide fuel/electrolysis stacks. In the current study, a torsion test is implemented to evaluate and compare its shear strength with a partially crystallized glass sealant at room- and operation relevant high-temperatures. Hourglass-shaped specimens with different configurations of hollow- and full-halves are utilized for testing. The fracture surfaces are visualized via optical microscopy and complementary scanning electron microscopy. In addition, cyclic loading is used to investigate potential subcritical crack growth effects in the sealants. Both, the specimens with a hollow-half as well as the ones with two full-halve steel plates yield almost the same nominal shear strengths. The shear fracture stresses decrease with rising temperature, while the fracture mode changes from brittle at room temperature and 600 °C to ductile at 800 °C. The cyclic loading condition indicates subcritical crack growth in the sealant at 600 °C and creep associated damage at 800 °C.
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room and high temperature flexural strength of a stable solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the Sealing Material is critical for the reliability of solid oxide fuel/electrolysis stacks. The current work concentrates on microstructural and mechanical aspects of a sealant Material for this application. In particular, the crystallization behavior as a determining factor for the sealants’ mechanical behavior is investigated via high-temperature XRD for 24 h. Furthermore, regarding mechanical properties, three- and four-point bending tests are carried out on sealant bars and head-to-head joined specimens at room- and high-temperatures, yielding in particular relevant fracture stress data. In addition, the elastic modulus is measured by the impulse excitation test from RT to 900 oC. Tests are done for both as-sintered (as-joined) and annealed samples. The main crystallization appears to happen during the initial joining time. The sealant shows a relatively stable flexural strength in terms of temperature dependency as well as effects of the aging process. In fact, the joined specimens reveal a more than 50% lower flexural strength than glass bars at all temperatures. A complementary finite element simulation indicates the presence of a non-negligible thermal residual stress in joined specimens.
M A Faghihisani - One of the best experts on this subject based on the ideXlab platform.
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room and high temperature torsional shear strength of solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the sealant Material is critical for the reliability of solid oxide fuel/electrolysis stacks. In the current study, a torsion test is implemented to evaluate and compare its shear strength with a partially crystallized glass sealant at room- and operation relevant high-temperatures. Hourglass-shaped specimens with different configurations of hollow- and full-halves are utilized for testing. The fracture surfaces are visualized via optical microscopy and complementary scanning electron microscopy. In addition, cyclic loading is used to investigate potential subcritical crack growth effects in the sealants. Both, the specimens with a hollow-half as well as the ones with two full-halve steel plates yield almost the same nominal shear strengths. The shear fracture stresses decrease with rising temperature, while the fracture mode changes from brittle at room temperature and 600 °C to ductile at 800 °C. The cyclic loading condition indicates subcritical crack growth in the sealant at 600 °C and creep associated damage at 800 °C.
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room and high temperature flexural strength of a stable solid oxide fuel electrolysis cell Sealing Material
Ceramics International, 2019Co-Authors: Fakouri M Hasanabadi, M A Faghihisani, A H Kokabi, S M Grosbarsnick, Jürgen MalzbenderAbstract:Abstract The structural integrity of the Sealing Material is critical for the reliability of solid oxide fuel/electrolysis stacks. The current work concentrates on microstructural and mechanical aspects of a sealant Material for this application. In particular, the crystallization behavior as a determining factor for the sealants’ mechanical behavior is investigated via high-temperature XRD for 24 h. Furthermore, regarding mechanical properties, three- and four-point bending tests are carried out on sealant bars and head-to-head joined specimens at room- and high-temperatures, yielding in particular relevant fracture stress data. In addition, the elastic modulus is measured by the impulse excitation test from RT to 900 oC. Tests are done for both as-sintered (as-joined) and annealed samples. The main crystallization appears to happen during the initial joining time. The sealant shows a relatively stable flexural strength in terms of temperature dependency as well as effects of the aging process. In fact, the joined specimens reveal a more than 50% lower flexural strength than glass bars at all temperatures. A complementary finite element simulation indicates the presence of a non-negligible thermal residual stress in joined specimens.