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Academic literature on the topic 'Glass-ceramic sealant'

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Published: 14 March 2023

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Journal articles on the topic "Glass-ceramic sealant"

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Gunawan, Sulistyo, and Iwan Setyawan. "Progress in Glass-Ceramic Seal for Solid Oxide Fuel Cell Technology." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 82, no. 1 (April 11, 2021): 39–50. http://dx.doi.org/10.37934/arfmts.82.1.3950.

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Solid oxide fuel cells (SOFCs) have emerged as promising energy conversion devices nowadays. SOFC consists of several components such as cathode, anode, electrolyte, interconnects, and sealing materials. In planar SOFC stack construction, the sealant and interconnection functions play an important role. Glass and ceramics are quite popularly used as SOFC sealing materials to achieve several functions including preventing leakage of fuel and oxidants in the stack and electrically isolating cells in the stack. In this review, material preparation, material composition, ceramic properties especially thermal properties are compared from various systems that have been developed previously. The main challenges and complexities in the functional part of SOFC sealants include: (i) chemical incompatibility and instability in the oxidizing and reducing environment by adjusting the value of the thermal expansion coefficient (CTE) with the interconnecting material during SOFC operation, and (ii) insulation of oxidizing fuels and gases by matching CTE anode and cathode. Also, the sealant glass transition determines the maximum permissible working temperature of the SOFC. The choice of method and analysis will provide data on various ceramic attributes. The search for thermal attributes consisting of Glass transition (Tg), Deformation temp (Td), Crystallization temp (Tx), Melting pt (Tm) became a focus on SOFC sealant development.
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Lawita, Pornchanok, Apirat Theerapapvisetpong, and Sirithan Jiemsirilers. "Effect of Bi2O3 on Thermal Properties of Barium-Free Glass-Ceramic Sealants in the CaO-MgO-B2O3-Al2O3-SiO2 System." Key Engineering Materials 659 (August 2015): 180–84. http://dx.doi.org/10.4028/www.scientific.net/kem.659.180.

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Barium-free glass-ceramic sealants for the planar solid oxide fuel cell (pSOFC) have attracted considerable attention to avoid the crystallization of the high coefficient of thermal expansion (CTE) BaCrO4; reaction product at the interface between barium-containing glass-ceramic sealants and Crofer22 APU interconnect, which decreases the long-term mechanical stability of the sealant. In this study, Barium-free glass-ceramic sealants in the CaO-MgO-B2O3-Al2O3-SiO2 system with varying amounts of Bi2O3 from 0 to 10 wt. % were prepared by conventional melting and their thermal properties were investigated. The glass transition temperature (Tg), dilatometric softening temperature, and coefficient of thermal expansion (CTE) were determined by a dilatometer. The Tg, onset of crystallization (Tx) and crystallization temperature (Tc) were obtained from DTA. Results of phase analysis by X–ray diffraction of glasses after thermal treatment at 900 oC for 2 h indicated that the major phase of all glasses was diopside (MgCaSi2O6) and minor phases were åkermanite (Ca2MgSi2O7) and forsterite (Mg2SiO4). The Tg of the fabricated glasses tended to decrease with increasing Bi2O3 content while the CTE of glasses increased after the thermal treatment and was in the range of requirement for SOFC sealant.
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Javed, Hassan, Antonio Gianfranco Sabato, Mohsen Mansourkiaei, Domenico Ferrero, Massimo Santarelli, Kai Herbrig, Christian Walter, and Federico Smeacetto. "Glass-Ceramic Sealants for SOEC: Thermal Characterization and Electrical Resistivity in Dual Atmosphere." Energies 13, no. 14 (July 17, 2020): 3682. http://dx.doi.org/10.3390/en13143682.

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A Ba-based glass-ceramic sealant is designed and tested for solid oxide electrolysis cell (SOEC) applications. A suitable SiO2/BaO ratio is chosen in order to obtain BaSi2O5 crystalline phase and subsequently favorable thermo-mechanical properties of the glass-ceramic sealant. The glass is analyzed in terms of thermal, thermo-mechanical, chemical, and electrical behavior. Crofer22APU-sealant-Crofer22APU joined samples are tested for 2000 h at 850 °C in a dual atmosphere test rig having reducing atmosphere of H2:H2O 50/50 (mol%) and under the applied voltage of 1.6 V. In order to simulate the SOEC dynamic working conditions, thermal cycles are performed during the long-term electrical resistivity test. The glass-ceramic shows promising behavior in terms of high density, suitable CTE, and stable electrical resistivity (106–107 Ω cm) under SOEC conditions. The SEM-EDS post mortem analysis confirms excellent chemical and thermo-mechanical compatibility of the glass-ceramic with Crofer22APU.
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Kingnoi, Namthip, Jiratchaya Ayawanna, and Nattapol Laorodphan. "Barium (Zinc) Borosilicate Sealing Glass and Joining Interface with YSZ Electrolyte and Crofer22APU Interconnect in SOFCs." Solid State Phenomena 283 (September 2018): 72–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.283.72.

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This work describes the performance of two glass-ceramic compositions, BaO-SiO2-B2O3 (Barium borosilicate glass: BaBS) and BaO-ZnO-SiO2-B2O3 (Barium zinc borosilicate glass: BaBS−Zn), used for joining YSZ ceramic electrolytes and Crofer22APU metallic interconnects in solid oxide fuel cells (SOFCs) working at 800°C for 50 h. ZnO had a negative effect on the thermal expansion coefficient (TEC) value of the BaBS-Zn glass-ceramic. XRD and SEM results revealed the formation of rod-shaped barium zinc silicate crystalline phases in the BaBS-Zn glass, which was accompanied by cracks and poor adherence at the YSZ/BaBS-Zn joint interface after working at 800°C for 50 h. The formation of cracks parallel to the interface between the Crofer22APU interconnect and the BaBS-Zn glass-ceramic sealant was observed due to the severe TEC mismatch. The BaBS glass–ceramic adhered well to the YSZ electrolyte as well as the pre-oxidized Crofer22APU without cracks. Chromium oxide scale developed between the pre-oxidized Crofer22APU/BaBS glass-ceramic joint interface with increasing the pre-oxidation temperature. This study shows that BaBS glass-ceramic is more effective than BaBS-Zn as a sealant for joining YSZ electrolytes and Crofer22APU metallic interconnects in SOFCs working at 800°C for 50 h.
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Ley, K. L., M. Krumpelt, R. Kumar, J. H. Meiser, and I. Bloom. "Glass-ceramic sealants for solid oxide fuel cells: Part I. Physical properties." Journal of Materials Research 11, no. 6 (June 1996): 1489–93. http://dx.doi.org/10.1557/jmr.1996.0185.

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A family of sealant materials has been developed for use in the solid oxide fuel cell (SOFC) and in other applications in the temperature range of 800–1000 °C. These materials are based on glasses and glass-ceramics in the SrO–La2O3–Al2O3–B2O3–SiO2 system. The coefficients of thermal expansion (CTE) for these materials are in the range of 8–13 × 10−6/°C, a good match with those of the SOFC components. These sealant materials bond well with the ceramics of the SOFC and, more importantly, form bonds that can be thermally cycled without failure. At the fuel cell operating temperature, the sealants have viscosities in the range of 104–106 Pa-s, which allow them to tolerate a CTE mismatch of about 20% among the bonded substrates. The gas tightness of a sample seal was demonstrated in a simple zirconia-based oxygen concentration cell.
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Haanappel, V. A. C., P. Batfalsky, S. M. Gross, L. G. J. de Haart, J. Malzbender, N. H. Menzler, V. Shemet, R. W. Steinbrech, and I. C. Vinke. "A Comparative Study Between Resistance Measurements in Model Experiments and Solid Oxide Fuel Cell Stack Performance Tests." Journal of Fuel Cell Science and Technology 4, no. 1 (February 28, 2006): 11–18. http://dx.doi.org/10.1115/1.2393301.

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Several combinations of glass-ceramic and steel compositions with excellent chemical and physical properties have been tested in the past in solid oxide fuel cell (SOFC) stacks, but there have also been some combinations exhibiting pronounced chemical interactions causing severe stack degradation. Parallel to the examination of these degradation and short-circuiting phenomena in stack tests, recently less complex model experiments have been developed to study the interaction of glass-ceramic sealants and interconnect steels. The sealants and steels were tested in the model experiments at operation temperature using a dual air/hydrogen atmosphere similar to stack conditions. The present work compares electrochemical performance under constant current load of SOFC stack tests with the resistance changes in model experiments. In addition, microstructural results of post-operation inspection of various sealant–steel combinations are presented. The model experiments have shown that under the chosen experimental conditions, distinct changes of the specific resistance of the specimens correlate well with the changes of the electrochemical performance of SOFC stacks, indicating that this method can be considered as an excellent comparative method to provide useful information on the physical and chemical interactions between glass-ceramic sealants and ferritic steels.
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Gross, Sonja M., Thomas Koppitz, Josef Remmel, Jean-Bernard Bouche, and Uwe Reisgen. "Joining properties of a composite glass-ceramic sealant." Fuel Cells Bulletin 2006, no. 9 (September 2006): 12–15. http://dx.doi.org/10.1016/s1464-2859(06)71320-7.

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Smeacetto, Federico, Auristela De Miranda, Andreas Chrysanthou, Enrico Bernardo, Michele Secco, Massimiliano Bindi, Milena Salvo, Antonio G. Sabato, and Monica Ferraris. "Novel Glass-Ceramic Composition as Sealant for SOFCs." Journal of the American Ceramic Society 97, no. 12 (September 11, 2014): 3835–42. http://dx.doi.org/10.1111/jace.13219.

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Laorodphan, Nattapol, and Jiratchaya Ayawanna. "BaO-Al2O3-SiO2-B2O3 Glass-Ceramic SOFCs Sealant: Effect of ZnO Additive." Key Engineering Materials 751 (August 2017): 455–60. http://dx.doi.org/10.4028/www.scientific.net/kem.751.455.

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The crystallization of planar solid oxide fuel cells (SOFCs) sealant glasses in the systems BaO-Al2O3-SiO2-B2O3 (BaBS) and BaO-Al2O3-SiO2-B2O3-ZnO (BaBS-Zn) was investigated via both X-ray diffractometer and scanning electron microscopy with energy dispersive spectroscopy. The effect of nucleation heat-treatment of the BaBS glass at different temperature for 5 hours, i.e. 550 and 590 °C, on the crystallization behavior was also studied. Thermal expansion profiles of the glasses indicate that both glasses have a low sealing temperature. XRD patterns of all BaBS glass-ceramics, devitrified at 800 °C for 30 hours, show that Ba2Si3O8, BaAl2Si2O8, Ba3B2O6 and some unknown crystalline phases were found. It was also found that crystalline size of unknown barium aluminosilicate with low silicon content depends on the nucleation heat-treatment temperature. For the ZnO-containing glass, ZnO reduces the coefficient of thermal expansion value of glass and causes the devitrification of large needle-like barium zinc silicate phases. The crack at the YSZ/BaBS-Zn glass-ceramic interface was also observed. Two barium silicate phases, which are BaZnSiO4 and BaZn2Si2O7 were devitrified in ZnO-containing glass-ceramic.
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Sohn, Sung-Bum, Se-Young Choi, Gyeung-Ho Kim, Hue-Sup Song, and Goo-Dae Kim. "Suitable Glass-Ceramic Sealant for Planar Solid-Oxide Fuel Cells." Journal of the American Ceramic Society 87, no. 2 (February 2004): 254–60. http://dx.doi.org/10.1111/j.1551-2916.2004.00254.x.

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Dissertations / Theses on the topic "Glass-ceramic sealant"

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Zhao, Yilin [Verfasser]. "Thermo-mechanical properties of glass-ceramic solid oxide fuel cell sealant materials / Yilin Zhao." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1046975137/34.

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DE, MIRANDA AURISTELA CARLA. "Design, production and characterization of glass-ceramic based sealants for solid oxide fuel cells applications." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2591557.

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Planar solid oxide fuel cells (SOFCs) are capable of achieving higher power density than tubular SOFC, but hermetic seals are required to prevent mixing of the fuel and oxidant, It is still a challenge to develop sealing materials that retain desirable physical properties, are chemically compatible with other fuel cell components at high temperature (e.g. 800 °C) in a wide range of oxygen partial pressure, and remain operational over thousands of hours. In most planar SOFCs stacks designs, the interconnect is sealed to the cell components. The seal between the metal interconnect and the ceramic SOFCs components presents a challenge. Design, development and implementation of reliable sealants may contribute to the destiny of SOFC electrical power-generation technology. Glass–ceramics, which can be prepared by controlled sintering and crystallization of glasses, possess superior mechanical properties and higher viscosity at the SOFC operating temperature than glasses. The application of a protective coating on the alloy surface has been proven as a practical and effective method to reduce corrosion rates and/or inhibit Cr volatilization and thus cathode poisoning. Though some coatings can be highly effective in reducing corrosion rates and reducing area specific resistance of metallic interconnects, their properties for blocking chromium diffusion are limited and need more research on advanced materials and new processing methods. Furthermore, in the complex contest of the SOFC stack, the interconnect/sealant interface plays a key role in the stack reliability, efficiency and durability that depends also on the gas tightness provided by seals during SOFC operation for thousands of hours. It is desirable that reactions between the sealant and the coating or the metallic interconnect are limited during SOFC relevant operating conditions, otherwise spallation and detachments at the interfaces can occur and determine leakage and SOFC degradation. Finally, different approaches are used in this work for the integration (i. e. joining) of ceramic and metallic components in solid oxide fuel cells (SOFCs) stacks, where dissimilar materials have to be joined and sealed for a reliable long-term operation. In particular, the thermo-mechanical compatibility of sealants with other stack components critically influence the reliability and the robustness of SOFCs devices.
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JAVED, HASSAN. "Design, synthesis and characterization of glass-ceramic and ceramic based materials for solid oxide electrolysis cell (SOEC) applications." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2743336.

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Reddy, Allu Amarnath. "Alkaline-earth aluminosilicate-based glass and glass-ceramic sealants for functional applications." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/15217.

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Doutoramento em Ciência e Engenharia dos Materiais
The planar design of solid oxide fuel cell (SOFC) is the most promising one due to its easier fabrication, improved performance and relatively high power density. In planar SOFCs and other solid-electrolyte devices, gas-tight seals must be formed along the edges of each cell and between the stack and gas manifolds. Glass and glass-ceramic (GC), in particular alkaline-earth alumino silicate based glasses and GCs, are becoming the most promising materials for gas-tight sealing applications in SOFCs. Besides the development of new glass-based materials, new additional concepts are required to overcome the challenges being faced by the currently existing sealant technology. The present work deals with the development of glasses- and GCs-based materials to be used as a sealants for SOFCs and other electrochemical functional applications. In this pursuit, various glasses and GCs in the field of diopside crystalline materials have been synthesized and characterized by a wide array of techniques. All the glasses were prepared by melt-quenching technique while GCs were produced by sintering of glass powder compacts at the temperature ranges from 800−900 ºC for 1−1000 h. Furthermore, the influence of various ionic substitutions, especially SrO for CaO, and Ln2O3 (Ln=La, Nd, Gd, and Yb), for MgO + SiO2 in Al-containing diopside on the structure, sintering and crystallization behaviour of glasses and properties of resultant GCs has been investigated, in relevance with final application as sealants in SOFC. From the results obtained in the study of diopside-based glasses, a bilayered concept of GC sealant is proposed to overcome the challenges being faced by (SOFCs). The systems designated as Gd−0.3 (in mol%: 20.62MgO−18.05CaO−7.74SrO−46.40SiO2−1.29Al2O3 − 2.04 B2O3−3.87Gd2O3) and Sr−0.3 (in mol%: 24.54 MgO−14.73 CaO−7.36 SrO−0.55 BaO−47.73 SiO2−1.23 Al2O3−1.23 La2O3−1.79 B2O3−0.84 NiO) have been utilized to realize the bi-layer concept. Both GCs exhibit similar thermal properties, while differing in their amorphous fractions, revealed excellent thermal stability along a period of 1,000 h. They also bonded well to the metallic interconnect (Crofer22APU) and 8 mol% yttrium stabilized zirconium (8YSZ) ceramic electrolyte without forming undesirable interfacial layers at the joints of SOFC components and GC. Two separated layers composed of glasses (Gd−0.3 and Sr−0.3) were prepared and deposited onto interconnect materials using a tape casting approach. The bi-layered GC showed good wetting and bonding ability to Crofer22APU plate, suitable thermal expansion coefficient (9.7–11.1 × 10–6 K−1), mechanical reliability, high electrical resistivity, and strong adhesion to the SOFC componets. All these features confirm the good suitability of the investigated bi-layered sealant system for SOFC applications.
A concepção planar de células de combustível de óxido sólido (SOFC) é a mais promissora devido a sua fabricação mais fácil, um melhor desempenho e uma densidade de potência relativamente elevada. Nas SOFCs planares e outros dispositivos de electrólitos sólidos são necessárias vedações estanques ao gás ao longo das arestas de cada uma das células e entre os tubos de distribuição de gás e de pilha. Materiais vítreos e vitrocerâmicos (GC), em particular com composições baseadas em aluminosilicatos alcalino-terrosos, estão entre os materiais mais promissores para aplicações de vedação à prova de gás em SOFCs. Além do desenvolvimento de novos materiais à base de vidros e vitrocerâmicos, são também necessários novos conceitos para superar os desafios enfrentados pela tecnologia selante atualmente existente. O presente trabalho visa dar um contributo nesse sentido, propondo soluções de vedação para SOFCs e outras aplicações electroquímicas. Para o efeito, foram sintetizados vários vidros e GCs à base de diópsido, os quais foram caracterizados por recurso a uma grande variedade de técnicas. Todos os vidros foram preparados por fusão, enquanto os GCs foram produzidos por sinterização (tratamento térmico) de compactos de pó de vidro nas faixas de temperatura de 800 − 900 ºC por 1 − 1000 h. Além disso, foram estudados os efeitos de diversas substituições iónicas, especialmente de CaO por SrO, e de MgO + SiO2 por Ln2O3 (Ln = La, Nd, Gd, e Yb), em composições de aluminosilicatos à base de diópsido na estrutura, sinterização e cristalização dos vidros e nas propriedades dos GCs resultantes com particular relevância para as propriedades de vedação em SOFCs. Com base nos resultados obtidos neste estudo, foi possível propor um novo conceito de selante vritrocerâmico em bi-camadas que visa ultrapassar os desafios enfrentados pelos vedantes actualmente usados em SOFCs. Os sistemas designados por Gd−0,3 (em % molar: 20,62 MgO−18,05 CaO−7,74 SrO−46,40 SiO2−1,29 Al2O3−2,04 B2O3−3,87 Gd2O3) e Sr−0,3 (em % molar: 24,54 MgO−14,73 CaO−7,36 SrO−0,55 BaO−47,73 SiO2−1,23 Al2O3−1,23 La2O3−1,79 B2O3−0,84 NiO) foram seleccionados para realizar o conceito de bi-camada. Ambos os GCs exibem propriedades térmicas semelhantes, e excelente estabilidade térmica ao longo de um período de 1.000 horas, mas diferem nas suas fracções vítreas/cristalinas. Eles revelaram também elevada aptidão para se ligarem à interconexão metálica (Crofer22APU) e ao electrólito sólido (zircónia estabilizada com 8 mol% de ítria (8YSZ) sem a formação de camadas interfaciais indesejáveis entre os diferentes componentes das SOFCs. Duas camadas separadas compostas pelos vidros (Gd−0,3 e Sr−0.3) foram preparadas e depositadas sobre as interconexões metálicas através de uma abordagem tape casting. As bi-camadas vitrocerâmicas mostram boa capacidade de molhamento e ligação à placa Crofer22APU, coeficientes de expansão térmica adequados (9,7−11,1 × 10−6 K−1), confiabilidade mecânica, elevada resistividade eléctrica, e uma forte adesão aos componentes da SOFC. Todas estas características confirmam a boa adequação do sistema selante bi-camadas investigado para aplicações em SOFCs.
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SABATO, ANTONIO GIANFRANCO. "Study of new glass-ceramic sealants and protective coatings for SOFC application: processing, characterization and performances in relevant conditions." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2674874.

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Solid oxide fuel cells (SOFC) offer potential for efficient and clean power generation obtained from a wide range of fuels (hydrocarbons, renewables and coal derived fuels). Advanced system configurations based on SOFC are currently being developed for applications in both centralized and distributed stationary generation. In a SOFC system, many cells are connected in a stack by an interconnect (ferritic stainless steel). In the planar stack design, the use of a sealant is necessary to prevent gas mixing. Furthermore, the use of Cr-containing metallic alloys as metallic interconnects leads to Cr-poisoning of the cathode. This PhD thesis focuses on two main topics: glass-ceramic sealants and protective coatings for interconnects (to prevent Cr-poisoning) for SOFC application. Two different Ba-free compositions were designed, produced and characterized as glass-ceramic sealants. The sintering-crystallization behaviour was studied in order to choose proper joining thermal treatments. The compatibility between these sealants and metallic interconnect materials was tested in different relevant conditions and the produced joined samples were morphologically and chemically characterized. AISI 441/glass-ceramic/AISI 441 joined samples were tested in dual atmosphere for 1100 h at 800 °C. Crofer 22 H, bare AISI 441 and Mn-Co spinel based coated AISI 441, coupled with the seal, were tested up to 3500 h at 800 °C in static air. The results of post-mortem analyses have been discussed in order to evaluate the integrity of the joining as well as possible interactions between the glass-ceramic and the metallic interconnects. Pre-oxidised Crofer 22 APU/glass-ceramic/pre-oxidised Crofer 22 APU “sandwich-like” samples were tested in dual atmosphere with the application of a DC voltage, for 100 h at 800 °C, by applying two different voltages, 0.7 V and 1.3 V; the resistivity was measured for all the duration of the test. The obtained values were compared with the resistivity of the glass-ceramic. Post-mortem morphological and chemical analyses were conducted in order to evaluate possible interactions between the glass-ceramic and the steel during the tests. The compatibility of one of the glass-ceramics was also tested with yttria-stabilized-zirconia electrolyte, after the joining process and after an aging at 800 °C for 250 h. The joined samples demonstrated low He leak rates values, 10-10 - 10-11 mbar l s-1, below the acceptable limit for SOFC application. Mn1.5Co1.5O4 protective coating was deposited on Crofer 22 APU with three different techniques: radio frequency (RF)-sputtering, thermal co-evaporation and electrophoretic deposition (EPD). The as-prepared coatings were characterized from the morphological and chemical point of view, making a comparison between the different techniques. Mn-Co coated samples were electrically tested for 5000 hours at 800 °C under a 500 mA cm-2 current load to determine their Area Specific Resistance. After tests, the samples were morphologically analysed. The relationships between coating thickness, homogeneity, and effectiveness of its protective nature are reviewed and discussed. The electrophoretic deposition was used also to dope Mn1.5Co1.5O4 with Cu with the aim to further improve the electrical conductivity and the coating densification. Coatings doped with different amounts of Cu, have been deposited and sintered. Samples were characterized in order to investigate the presence of Cu in the protective layer and their morphology, and subsequently submitted to oxidation resistance tests as well as to long term ASR test. Both the glass-ceramics studied here showed good performance in terms of sintering ability and thermo-mechanical properties. The interfacial compatibility was found to be very good with different substrates. Corrosion phenomena (unlikely due to interactions with the glass-ceramic) were detected in the case of one glass-ceramic coupled to pre-oxidised AISI 441 exposed to dual atmosphere. Furthermore, the application of the voltage in the case of the second sealant seems to induce interactions with the pre-oxidised Crofer 22 APU, decreasing the resistivity of the joining. The two sealants were subjected to slightly different tests. Even if one of them demonstrated better performance in terms of CTE and compatibility with Crofer 22 APU (the most used interconnect steel at the moment), further studies are needed in order to attest the best choice. Out of the three Mn-Co coatings compared in this thesis, the one deposited by EPD presents the best protection against Cr diffusion as well as the best behaviour during long term ASR test. The rate of increase of the ASR, calculated by linear fitting of the curves between 2000-5000 hours, gives a value of 3.9 mΩ cm2/1000h for thermal co-evaporation, sputtering and not-coated samples and a value of 1.2 mΩ cm2/1000h for EPD coated sample. Assuming a simple linear extrapolation of the values up to 40000 hours, the EPD coated sample would have a total ASR of about 60 mΩ cm2, so below the acceptable limit.
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Chen, Yi-Ju, and 陳怡如. "BaO-B2O3-SiO2-Al2O3 Glass Ceramic system used as Sealant for Intermediate-Temperature Solid Oxide Fuel Cell (IT-SOFC)." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/58121142098617370253.

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碩士
國立臺灣大學
材料科學與工程學研究所
96
Several formulations of the glass based on BaO-B2O3-SiO2-Al2O3 systems have been developed and accepted as an appropriate compliant sealing material for planar Solid Oxide Fuel Cells (SOFC) operated at 800oC. The sealing materials in this study are designed by considering lower Tg (glass transition temperature) slightly than the set operation temperature (600-650oC), small CTE mismatch, chemically and physically compatible with the other components, and good wettability with specified substrates. Three main subjects are investigated in this study. The first one is the synthesis and characterization of the glasses, including thermal properties and crystallization behavior. The second is the investigation on crystallization kinetics by using Kissinger equation and Piloyan plot. Third one is to analyze the interfacial stability of the glass with 8YSZ or SDC. Differential thermal analysis (DTA) and Thermal Mechanical Analysis (TMA) were applied to study the thermal properties of the glass. X-ray diffraction (XRD) analysis was conducted to study the crystallization behavior. Scanning and transmission electron microscopes (SEM and TEM) with energy dispersive spectroscopy (EDS) were employed to observe the microstructure and phase evaluation. The results show that 47BaO-21B2O3-27SiO2-5Al¬2O3 (G1A5) possess better glass forming ability (GFA) than other formulation, and has the matched working temperature range (547-694oC) close to the operation temperature 600-650oC of IT-SOFC . The major crystalline phases that would precipitate from the glass matrix during IT-SOFC operation were hexacelsian and BaSiO3. The activation energies for each crystalline phase are 423±38 kJ/mol and 363±19 kJ/mol. When it comes to sealing with 8YSZ, although G1A5 glass can not have a good bonding property with 8YSZ, but it can seal very well with SDC, even after long-term thermal treatment (100 hr at 650oC). On the other hand, in this study we also found out another glass formulation, 53BaO-12B2O3-34SiO2-1Al¬2O3 (G6) can have a good bonding behavior with 8YSZ.
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Hou, Fan-lin, and 侯梵琳. "Effects of LSM Coating on Joining Strength Between Metallic Interconnect and Glass-Ceramic Sealant for Solid Oxide Fuel Cell." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/83457853690913104073.

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碩士
國立中央大學
機械工程學系
103
The objective of this study is to investigate the joint strength between glass-ceramic sealant and LSM-coated metallic interconnect both in air and a reducing environment (H2-7 vol% H2O) at RT and 800 °C. The applied materials are a GC-9 glass-ceramic developed at the Institute of Nuclear Energy Research (INER), a LSM layer coated at INER, and a commercial Crofer 22 APU ferritic stainless steel. The joint strength is reduced as the testing temperature is increased from room temperature (RT) to 800 °C, regardless of specimen condition. The joint strength between the given GC-9 glass-ceramic sealant and Crofer 22 APU interconnect steel is degraded by 36-80% in applying a LSM coating on the interconnect steel. The shear strength of LSM-coated specimen is enhanced by 52-200% at RT and 800 °C after 1000-h thermal aging in air. This may be attributed to a self-healing effect of the GC-9 glass-ceramic during the thermal aging treatment in air to reduce the pore size existent around the GC-9/LSM interface. As for tensile specimen, the enhancement of joint strength is insignificant after thermal aging in air. A thermal aging of 1000 h in H2-7 vol% H2O reduces the shear strength by 44-100% at RT and 800 °C while it reduces 65% of the tensile strength at RT but enhances it by 87% at 800 °C. The enhancement of tensile strength at 800 °C may result from diffusion of water into GC-9 and relaxation of GC-9 structure during thermal aging in wet hydrogen. No significant environment effect on the joint strength of non-aged, coated specimen is found due to a short period of mechanical testing. After 1000 h-aging in each environment, the joint strength of coated specimens aged in H2-7 vol% H2O is generally lower than that aged in air except the tensile strength at 800 °C. The exception may be associated with a water softening effect during thermal aging in H2-7 vol% H2O. Cr2O3 is observed between LSM and metal substrate in the LSM-coated joint. Pores within GC-9 as well as at the interface of LSM and GC-9 are found in the LSM-coated specimen. Cr is well blocked by the LSM coating such that BaCrO4 is observed only in air-aged specimen due to LSM volume shrinkage. Spinel is observed within the GC-9 pores on the LSM layer after thermal aging in both oxidizing and reducing environments, with a higher density found in the specimen aged in air. The joint strength and fracture path are affected by the pores existent around the LSM/GC-9 interface for the LSM-coated joint. A self-healing effect of GC-9 glass-ceramic at high temperature could help heal these pores and improve the joint strength.
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Chen, Yi-Ju. "BaO-B2O3-SiO2-Al2O3 Glass Ceramic system used as Sealant for Intermediate-Temperature Solid Oxide Fuel Cell (IT-SOFC)." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2107200809555500.

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Lin, Kun-liang, and 林坤亮. "Analysis of Creep Properties of Glass Ceramic Sealant and Its Joint with Metallic Interconnect for Solid Oxide Fuel Cells." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/27998474506579563885.

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碩士
國立中央大學
機械工程研究所
100
Creep properties at 800 oC are investigated for a newly developed solid oxide fuel cell glass-ceramic sealant (GC-9) in variously aged conditions using a ring-on-ring test technique. Creep properties of sandwich joint specimens made of GC-9 and a interconnect steel (Crofer 22 H) are also investigated at 800 oC under several constant shear and tensile loadings. When subjected to an applied constant load at 800 oC, the 1000 h-aged GC-9 can last longer than the non-aged and 100 h-aged ones before rupture. The 1000 h-aged GC-9 also exhibits a much smaller minimum creep strain rate than do the non-aged and 100 h-aged ones. Therefore, a longer aging time of 1000 h leads to a greater extent of crystallization and creep resistance at 800 oC for the given GC-9 glass-ceramic sealant. The creep strength at 1000 h is about 6 MPa, 9 MPa, and 15 MPa, for the non-aged, 100 h-aged, and 1000 h-aged GC-9, respectively. The creep rupture time of Crofer 22 H/GC-9/Crofer 22 H joint specimens is increased with a decrease in the applied constant load at 800 oC for both shear and tensile loading modes. The creep strength at 1000 h under shear loading is about one quarter of the shear strength at 800 oC. The tensile creep strength at 1000 h is about 9% of the tensile strength at 800 oC. Failure patterns of both shear and tensile joint specimens are similar regardless of the creep rupture time. Cracks initiate at the interface between the spinel layer and chromate (BaCrO4) layer, penetrate through the BaCrO4 layer, and propagate along the interface between the chromate layer and glass-ceramic substrate until final fracture. Final, fast fracture occasionally takes place within the glass-ceramic layer.
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Yeh, Jing-Hong, and 葉勁宏. "Analysis of High-Temperature Mechanical Durability for the Joint of Glass Ceramic Sealant and Metallic Interconnect for Solid Oxide Fuel Cell." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/24440539027544024424.

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碩士
國立中央大學
機械工程研究所
99
Mechanical properties at various temperatures (25 oC-800 oC) were investigated for a newly developed solid oxide fuel cell glass sealant (GC-9) in variously aged conditions. The joint strength between the GC-9 glass-ceramic sealant and an interconnect steel (Crofer 22 H) coated with La0.67Sr0.33MnO3 (LSM) was also investigated at 800 oC. In addition, creep rupture properties of the joint specimens were also investigated at 800 oC under constant loading. For the 1000 h-aged, sintered GC-9 glass, the flexural strength at 650 oC-750 oC was greater than that at 25 oC due to a crack healing effect. From the force-displacement curves of the 1000 h-aged GC-9 glass, the inferred glass transition temperature (Tg) was between 750 oC and 800 oC. Therefore, its flexural strength was significantly reduced at 800 oC due to a viscous effect. However, a greater flexural strength and stiffness of the aged GC-9 glass over the non-aged one was observed at temperature higher than 700 oC due to a greater extent of crystallization. Both the shear and tensile bonding strength at 800 oC of the joint specimens coated with LSM were weaker than those of the non-coated ones. Through analysis of the interfacial microstructure, microvoids and microcracks were found at the BaCrO4 chromate layer. When the LSM coating film and BaCrO4 layer were joined together with incompatible deformation, microvoids/microcracks were formed at the BaCrO4 The creep rupture time of both shear and tensile joint specimens was increased with a decrease in the applied constant load at 800 layer. In this regard, the joint strength was degraded by such a coating. oC. The creep strength at 1000 h under shear loading was about one fifth of the shear strength at 800 oC. The tensile creep strength at 1000 h was about 8% of the tensile strength at 800 oC. The failure pattern of the shear creep joint specimens with a shorter creep rupture time was similar to that of the shear joint strength test specimens while a different failure pattern was found for a longer creep rupture time.
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Books on the topic "Glass-ceramic sealant"

1

American Society of Mechanical Engineers. Winter Meeting. Technology of glass, ceramic, or glass-ceramic to metal sealing: Presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Boston, Massachusetts, December 13-18, 1987. New York, N.Y: American Society of Mechanical Engineers, 1987.

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W, Kraft, Deutsche Gesellschaft für Metallkunde, and International Conference on Joining Ceramics, Glass and Metal (3rd : 1989 : Bad Nauheim, Germany), eds. Joining ceramics, glass, and metal. Oberursel: DGM Informationsgesellschaft, 1989.

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Moddeman. Technology of Glass Ceramic or Glass Ceramic to Metal Sealing/Asme Md. Vol. 4./G00402. Amer Society of Mechanical, 1987.

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Book chapters on the topic "Glass-ceramic sealant"

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Hbaieb, Kais. "Determination of Fracture Strength of Glass-Ceramic Sealant Used in SOFC." In Advances in Solid Oxide Fuel Cells V, 195–201. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470584316.ch18.

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Liu, W. N., X. Sun, B. Koeppel, and M. A. Khaleel. "Creep Behavior of Glass/Ceramic Sealant Used in Solid Oxide Fuel Cells." In Advances in Solid Oxide Fuel Cells V, 203–9. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470584316.ch19.

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Schwickert, T., U. Diekmann, P. Geasee, and R. Conradt. "Performance of Different Glass-Ceramic Sealants for a Planar SOFC Concept." In Functional Materials, 217–20. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607420.ch37.

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Gross, S. M., T. Koppitz, J. Remmel, and U. Reisgen. "Glass-Ceramic Materials of the System BaO-CaO-SiO2 as Sealants for SOFC Applications." In Ceramic Engineering and Science Proceedings, 239–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470291245.ch27.

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Gross, S. M., T. Koppitz, and N. H. Menzler. "Chemical Reaction Behavior Between Glass-Ceramic Sealants and High Chromium Ferritic Steels Under Various SOFC Conditions." In Ceramic Engineering and Science Proceedings, 209–16. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470291245.ch24.

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Sabato, Antonio G., Hassan Javed, Milena Salvo, Andreas Chrysanthou, and Federico Smeacetto. "Glass–Ceramic Sealants for Solid Oxide Cells Research at Politecnico di Torino: An Overview on Design, Sinter-Crystallization, Integration and Interfacial Issues." In PoliTO Springer Series, 203–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85776-9_6.

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"Glass and Ceramics Repair and Bonding." In Industrial Polymer Applications: Essential Chemistry and Technology, 140–48. The Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/bk9781782628149-00140.

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This chapter provides an overview of the make-up and properties of traditional ceramic materials, technical ceramics, glass-ceramics and advanced ceramics used in traditional industrial and engineering applications. The applications for which the essential chemistry and technology of polymeric repair and bonding solutions, and the appropriate fitness-for-purpose testing methods considered are: Repair of small cracks, chips and pinholes in glass-fused-to-steel and where larger cracks or holes extend through to the steel; Bonding and restoration of broken porcelain electrical insulation components with polymeric adhesives and putty materials, and sealant/coating insulator glaze replacement; Bonding and restoration of advanced ceramics with high performance thermoplastic and thermoset pre-cast or pre-impregnated adhesive films, sheets and tapes as alternatives to ceramic adhesives where operating temperatures permit.
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Gross-Barsnick, Sonja-Michaela. "Interaction of glass-ceramic sealants with solid oxide fuel cell components: thermo-mechanical analysis." In Intermediate Temperature Solid Oxide Fuel Cells, 411–26. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-817445-6.00012-0.

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Basu, Rajendra, Saswati Ghosh, A. Sharma, P. Kundu, Arjun Dey, and Anoop Mukhopadhyay. "Nanoindentation Behavior of High-Temperature Glass–Ceramic Sealants for Anode-Supported Solid Oxide Fuel Cell." In Nanoindentation of Brittle Solids, 243–48. CRC Press, 2014. http://dx.doi.org/10.1201/b17110-40.

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Conference papers on the topic "Glass-ceramic sealant"

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Chang, Hsiu-Tao, Chih-Kuang Lin, and Chien-Kuo Liu. "High Temperature Mechanical Properties of a Crystallized BaO-B2O3-Al2O3-SiO2 Glass Ceramic for SOFC." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85084.

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The high temperature mechanical properties in a glass-ceramic sealant of BaO-B2O3-Al2O3-SiO2 system was studied by four-point bending test at room temperature, 550°C, 600°C, 650°C, and 700°C, to investigate the variation of Young’s modulus, flexural strength, and stress relaxation. Weibull statistic analysis was applied to describe the fracture strength of the given glass ceramic. The crystalline phase was produced by controlled heat treatment and analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that the flexural strength was enhanced at high temperatures when the testing temperature was below the glass transition temperature (Tg). This was presumably due to a crack healing effect taking place at high temperature. Significant stress relaxation for the given glass ceramic was observed to generate extremely large deformation without breaking the specimens when the testing temperature was set at 700°C.
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Caron, N., L. Bianchi, and S. Méthout. "Development of a Sealing Technical Layer for SOFCs Applications." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p0094.

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Abstract Solid oxide fuel cell are being widely considered as the promising answer to the fossil energy decrease. To achieve high efficiency and longevity for SOFC stack it is essential to maintain stable hermetic sealing. In order to obtain an efficient airtightness between two SOFC layers, the authors had developed a solid seal composed with a ceramic matrix charged with glass particles. The seal is plasma-sprayed using low-cost manufacturing methods such as atmospheric plasma spraying. This technical deposit can be plasma-sprayed on a wide range of substrates: whatever its nature and shape. It is solid, distortable and adhesive to its support at ambient temperature. The sealing properties are acquired when the SOFC is put into service: the glassy phase migrates into the peculiar plasma-sprayed microstructure of the ceramic matrix towards the interface involving the airtightness. The performance of this seal are pretty good: the leak rate observed at 70 mbar is 0.0042 mbar.l/s whereas the preconisation of the US Department of Energy is 0.005 mbar.l/s.
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Huang, X., K. Ridgeway, S. Narasimhan, K. Reifsnider, and X. Ma. "Application of Plasma Sprayed Coatings in a Novel Integrated Composite Seal for SOFCs." In ITSC2006, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, R. S. Lima, and J. Voyer. ASM International, 2006. http://dx.doi.org/10.31399/asm.cp.itsc2006p0361.

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Abstract Affordable and reliable solid oxide fuel cells (SOFCs) are being widely sought as the next-generation answer to the power needs of many applications throughout the world. Maintaining stable hermetic sealing is critical for SOFC stacks to achieve high efficiency and longevity. The authors have introduced a novel multi-layered composite seal, consisting of thin layers of oxidation resistant alloys, plasma sprayed ceramic, and hermetic filler materials. The seal structure will be directly fabricated onto the surfaces of mating adherends using low-cost manufacturing methods such as atmospheric plasma spray (APS). During stack assembly, sealing can be achieved through a simple heat/pressure-assisted curing process. As an important part of the layered composite seal, a plasma sprayed porous alumina-YSZ (yttria-stabilized zirconia) ceramic coating on Fe-Cr based interconnect material has been developed. The ceramic coating was made from low-cost commercially available powders and deposited by atmospheric plasma spray (APS) method. The coating composition and fabrication procedure were optimized for high mechanical robustness, low electric conductivity. Experimental results based on coated “button” samples have demonstrated good bond strength between the plasma-sprayed ceramic layers and interconnect substrates, excellent thermal shock resistnace, good electrical insulation properties, and low permeability. Initial testing result of a composite seal formed with a glass filler has shown a low gas leak rate and good thermo-cycling resistance.
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Mao, Xiaoan, Patcharin Saechan, and Artur J. Jaworski. "Evaluation of Random Stack Materials for Use in Thermoacoustic Refrigerators." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24763.

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In a thermoacoustic refrigerator, energy conversion between thermal and acoustic power is achieved by means of an oscillatory motion of a compressible fluid along a solid body referred to as “stack”. Traditionally, stacks have been most often made by arranging large number of thin plates at equal spacing to fill out the cross section of a thermoacoustic resonator. Other geometries such as circular pores, square or hexagonal pores (honeycombs) or pin-arrays can also be considered. Most common irregular geometry includes layers of woven wire mesh stacked along the resonator length. The advantages of thermoacoustic engines over other conventional energy conversion devices lie in their relatively simple hardware assembly, without the need for any dynamic sealing and lubrication. However, the fabrication of stacks, for example made out of very thin parallel plates, is usually costly and impractical, while using pre-fabricated stacks (e.g. ceramic catalytic converter substrates or honeycomb used in aerospace industry) has high materials costs, which limits the cost advantages of thermoacoustic engines. However, many of these problems could be avoided if irregular stack geometries made out of random (very often waste) materials could be used. There is a wide range of such candidate materials, including glass or steel wool, ceramic chippings, waste material from metal machining (swarf, Scourers), beds of glass or metal balls etc. However the main difficulty is the lack of experimental data characterising the performance of such stacks at the design stage. In this paper, the performance of a standing wave thermoacoustic refrigerator with a stack made of a few chosen random materials, is measured and compared to the one with a parallel plate stack. It is hoped that this work will be beneficial for developing low-cost thermoacoustic prime movers and heat pumps.
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Choi, Won Kyoung, Moon Gi Cho, Sun Kyoung Seo, Hyuck Mo Lee, Byung Gil Jeong, Hwa-Sun Lee, Young-Chul Ko, Jin-Ho Lee, and Chang Youl Moon. "Hermetic Packaging of Micro Scanner for Laser Display Applications." In ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73252.

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Laser display technologies have been developed for an excellent expression of natural color, low power consumption and a long lifetime compared to other advanced displays, such as LCD, PDP and other projection type displays. The micro scanner is one of the key devices to make possible the raster scanning type laser projection displays. And the hermetic package of the micro scanner should be required for the protection from the environmental variations so as to keep the driving behavior uniform. Hermetic package can be ensured when the package is sealed hermetically without generating any outgases in the cavity. Thus, the hermetic sealing process was optimized through DOE (Design of Experiment) method using the Sn-In-Ag solder alloys instead of adhesives. And the characterizations of the packages were carried out in terms of hermeticity, shear strength, and interface microstructures. As a result, we’ve got about 2E−9 atm cc/sec He leak rate, which is low enough to pass the standard (MIL-STD-883E). Shear strength was as high as ∼80 MPa. The C-mode SAM images showed the continuous sealing area without any voids. In addition, the interfacial microstructures revealed good adhesion to the both parts, the glass lid and the ceramic package.
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Tamaura, Y., H. Kaneko, Y. Naganuma, S. Taku, K. Ouchi, and N. Hasegawa. "Simultaneous Production of H2 and O2 With Rotary-Type Solar Reactor (Tokyo Tech Model) for Solar Hybrid Fuel." In ASME 2008 2nd International Conference on Energy Sustainability collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/es2008-54282.

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The rotary-type solar reactor has been developed for solar hydrogen production with the two-step water splitting process using the reactive ceramic (Ni, Mn-ferrite). The rotary-type reactor has the rotating tubular cylinder covered on a reactive ceramic and dual reaction cells for O2-releasing and H2-generation reactions. The successive evolutions of O2 and H2 gases were observed in the O2 releasing and H2 generation reaction cells, respectively, with the prototype (small) reactor (diameter of cylinder ; 4cm). There is an upper limit for the rate of H2 gas evolution in the case of the prototype reactor because of the slow rotation rate in a small irradiation area. To confirm the practical operation of the rotary-type solar reactor with the two-step water splitting process for the simultaneous production of H2 and O2 gases, a scaled-up rotary-type solar reactor with 400cm2 of the irradiation area was fabricated (diameter; 50cm). The scaled-up reactor made of inner and outer short tubular cylinders (stainless steel) has a quartz glass window for the irradiation of reactive ceramic coated on the inner tubular cylinder (cylindrical rotor) and reaction cells were aligned in the sharing spaces between the inner and outer short tubular cylinders with gas sealing mechanisms. In the reactor, reactive ceramic coated on the inner tubular cylinder was heated up to 1800K by using the infrared imaging lamps (solar simulator) with thermal flux = 600kW/m2. The solid solution between YSZ and Ni-ferrite was used as reactive ceramic for the scaled-up reactor in order to prevent from sintering at a high temperature in the O2-releasing reaction, since the sintering of reactive ceramic resulted in lowering the yield of H2 gas evolution in the H2-generation reaction. The amounts of H2 and O2 gases evolved at the rotation rate of 0.3rpm were evaluated to 64cm3 and 30cm3 for 10min with the scaled-up rotary-type solar reactor, respectively, which were much larger than those with the prototype reactor. The simultaneous evolutions of H2 and O2 gases in the two-step water splitting process were repeated by employing the scaled-up reactor with the solid solution between YSZ and Ni-ferrite.
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Shahien, M., K. Shinoda, and J. Akedo. "Hybrid Aerosol Deposition as an Outstanding Prospective for Dense Barrier Ceramic Coatings Deposition on Different Substrates." In ITSC2022. DVS Media GmbH, 2022. http://dx.doi.org/10.31399/asm.cp.itsc2022p0709.

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Abstract Deposition of protective dense environmental barrier layers is a promising solution to improve the reliability and environmental durability of the next-generation turbines and other industrial applications. In this context, spraying of fine particles could enhance the formation of fine dense coating microstructures with improved properties. In AIST we are focusing on the spraying of the fine particles via different spraying technologies including suspension plasma spraying, as well as deposition of the fine solid particles directly by aerosol deposition (AD) and plasma-assisted aerosol deposition (so-called Hybrid Aerosol Deposition; HAD. The HAD is a new coating window to spray the fine ceramic particles via the implementation of a low-power rf-plasma source to assist the aerosol deposition at room temperature. This study introduced the feasibility of utilization of HAD as an outstanding technology for deposition of dense ceramic coatings on different substrate materials and 3D deposition capability. Highly dense and well-adhered Al2O3 coatings without obvious observable cracks and bulk-like properties were successfully fabricated on different substrate materials of SUS 304, Aluminium, Al2O3 and glass, via HAD of fine particles. The substrate material and its hardness significantly influenced the first deposition step, which determined the coating adhesion and properties. Furthermore, homogeneously uniform, dense, and crack-free coating with a strong adhesion has been fabricated successfully on cylindrical substrates with 6.3 mm diameter. During HAD spraying the plasma activated the surface of the particles without reaching to the molten state, then the activated particles impact and stuck with the substrate by room temperature impact consolidation mechanism. Therefore, the fabricated coatings had the same crystal structure as the starting feedstock powder, and the activated surface act as glue and improved the deposition efficiency and 3D capabilities. Herein, the deposition phenomena of HAD makes it as a promising candidate technology for development of environmental and sealing layers of highly dense microstructure, with the targeted crystalline phase structure, without stoichiometric composition nor phase transformation and improved deposition efficiency on multi-shape components in different fields such as environmental, thermal barrier coatings (TBCs), environmental barrier coatings (EBCs) and gas turbine applications.
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Preussner, Brian D., Joseph A. Nenni, and Vondell J. Balls. "An Overview of Risk Management Planning for Hot-Isostatic Pressure Treatment of High-Level Waste Calcine for the Idaho Cleanup Project." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78150.

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The Calcine Disposition Project (CDP) of the Idaho Cleanup Project (ICP) has the responsibility to retrieve, treat, and dispose of the calcine stored at the Idaho Nuclear Technology and Engineering Center (INTEC) located at the Idaho National Laboratory. Calcine is the granular product of thermally treating, or calcining liquid high-level waste (HLW) that was produced at INTEC during the reprocessing of spent nuclear fuel (SNF) to recover uranium. The CDP is currently designing the Hot Isostatic Pressure (HIP) treatment for the calcine to provide monolithic, glass-ceramic waste form suitable for transport and disposition outside of Idaho by 2035 in compliance with the Idaho Settlement Agreement. The HIP process has been used by industry since its invention, by Battelle Institute, in 1955. Hot isostatic pressing can be used for upgrading castings, densifying pre-sintered components, and consolidate powders. It involves the simultaneous application of a high pressure and temperature in a specially constructed vessel. The pressure is applied on all sides with a gas (usually inert) and, so, is isostatic. The CDP will use this treatment process (10,000 psi at 1,150 C) to combine physically and chemically a mixture of calcine and granular additives into a non leachable waste-form. The HIP process for calcine involves filling a metal can with calcine and additives, heating and evacuating the can to remove volatiles, sealing the can under vacuum, and placing the can within the HIP machine for treatment. Although the HIP process has been in use for over 50 years it has not been applied in large scale radioactive service. Challenges with retrofitting such a system for Calcine treatment include 1) filling and sealing the HIP can cleanly and remotely, 2) remotely loading and unloading the HIP machine, and 3) performing maintenance and repair on a 300 ton, hydraulically actuated machine in a highly radioactive hot cell environment. In this article, a systems engineering approach, including use of industry-proven design-for-quality tools and quantitative assessment techniques is summarized. Discussions on how these techniques were used to improve high-consequence risk management and more effectively apply failure mode, RAMI, and time and motion analyses at the earliest possible stages of design are provided.
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Reports on the topic "Glass-ceramic sealant"

1

Craven, S., D. Kramer, and W. Moddeman. Chemistry of glass-ceramic to metal bonding for header applications: 2. Hydrogen bubble formation during glass-ceramic to metal sealing. Office of Scientific and Technical Information (OSTI), December 1986. http://dx.doi.org/10.2172/6963554.

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Cassidy, R. T., and W. E. Moddeman. Sealing of Al-containing stainless steel to lithia-alumina-silica glass-ceramic. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/274154.

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