New glass and glass–ceramic sealants for planar solid oxide fuel cells

Smeacetto, Federico; Salvo, Milena; Bytner, F. D’Herin; Leone, Pierluigi; Ferraris, Monica

doi:10.1016/j.jeurceramsoc.2009.09.033

Cited by 63 publications

(20 citation statements)

References 34 publications

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“…Some compositions of glasses employed as sealants in SOFC are summarized in Table 2, and selected properties are provided in Table 3. Table 3 continued Glass code Metals commonly employed as interconnects in fuel cell designs include various austenitic and ferritic stainless steels, for example, Fe20Cr and FeCrAlY alloys, in addition to Ni-based superalloys, as summarized in [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74], together with some BaO-free silicate glasses [74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89]. Low-silica and silica-free borate-based compositions have also been reported [90][91][92][93].…”

Section: Sofc Alloysmentioning

confidence: 99%

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Recent developments in the preparation, characterization and applications of glass- and glass–ceramic-to-metal seals and coatings

et al. 2011

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There has, in recent years, been a major revival of interest in glass-and glass-ceramic-to-metal seals and coatings for new applications. Experience dictates that many factors need to be taken into consideration in the successful design and manufacture of high-quality seals, particularly if an adequate component lifetime is to be achieved. For example, during their preparation, undesirable reactions may occur between diffusing metal species and glass constituents, and these can lead to the formation of highly localized internal stresses, which can initiate failure of a seal either during manufacture or, more seriously, whilst in service due to the influence of static fatigue. In the case of high-temperature systems, reactions under hostile operating conditions also need to be taken into consideration. In this review, the factors learnt from past experience that influence the formation and lifetime behaviour of glass and glass-ceramic/metal systems are briefly introduced, and their relevance to the newer applications including solid oxide fuel cell sealants and coatings on titanium for biomedical applications is discussed.

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Section: Sofc Alloysmentioning

confidence: 99%

“…11 Interfaces between sealing glass, YSZ and Crofer22APU alloy. Reprinted from Smeacetto et al [82], with permission from Elsevier coating Ti [142]. The coatings were found to be low in porosity, with a uniform distribution of the crystalline and amorphous phases.…”

Section: Sofc Alloysmentioning

confidence: 99%

Recent developments in the preparation, characterization and applications of glass- and glass–ceramic-to-metal seals and coatings

et al. 2011

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“…Joining and sealing approaches can be based on glass, glass ceramics or glass composites or metallic sealants [1][2][3][4]. Glasses and glass ceramics appear to have better resistance to oxidizing and reducing atmospheric conditions in the stack than metallic sealants and especially appear to fulfill most of the SOFC specific requirements.…”

Section: Introductionmentioning

confidence: 99%

“…Glasses and glass ceramics appear to have better resistance to oxidizing and reducing atmospheric conditions in the stack than metallic sealants and especially appear to fulfill most of the SOFC specific requirements. In particular the sealant should hermetically separate anode and cathode gas supply and should be chemically stable to any component material or gaseous species in the stack environment and possess a sufficient bonding strength to withstand the operation induced stresses [1]. Compared to metallic materials glass ceramic materials are generally cheap and can be applied to the sealing surfaces as a powder dispersed in a paste, as tape cast sheets or by screen printing.…”

Section: Introductionmentioning

confidence: 99%

Flexural Strength and Viscosity of Glass Ceramic Sealants for Solid Oxide Fuel Cell Stacks

Malzbender

Zhao

2012

Fuel Cells

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The structural integrity of the sealing material is critical for the reliability of solid oxide fuel cell stacks. In this respect failure and deformation are aspects which need to be assessed in particular for glass ceramic sealant materials. Bending tests were carried at room temperature and typical stack operation temperature for glass ceramic sealants with different crystallization levels. Elastic moduli, fracture stresses, and viscosity values are reported. In addition to sintered bars some bending testing were carried out for steel specimens that were head‐to‐head joined with the glass ceramics similar as in a stack application. The ceramic particle reinforced sealant material was screen printed onto the steel. The results reveal a decrease of the strength for the partially crystallized sealant at operation relevant temperatures that can be associated with the viscous deformation of the material.

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“…To develop a suitable glass sealant for planar SOFCs, many studies have been carried out with the purpose of the applications of the glass or glass-ceramic-based materials like alkali silicate, alkaline-earth silicate, alkali borosilicate such as Pyrex,n aluminophosphate [15][16][17][18][19][20][21][22][23][24][25][26][27]. However, each material has a few drawbacks known as high thermal mismatch, and poor long-term stability due to the active interface reaction with other SOFC components.…”

Section: Introductionmentioning

confidence: 99%