Ceramics seals

Ceramic sealants have been fabricated to join the components of SOFC with reaction bonding. Anyhow, the ceramic may not exhibit CTE matching, and hence 

Other pSOFC joining techniques that have been considered include the use of high-temperature cements and sealants formed by reaction bonding. Although commercial ceramic adhesives such as Duco and Sauereisen cements have been 

Stable as the membrane material made from materials costing no more than the membrane material and straightforward to fabricate. Their invention is one of the key enabling technologies for implementing planar ceramic membranes. 

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Glass Ceramics Sealing Glasses Catalyst Supports Fiber Optic Preforms Contolled Pore Glasses... 

In addition to the aforementioned interactions with the surrounding gas environments, metallic interconnects also interact with adjacent components at their interfaces, potentially causing degradation of metallic interconnects and affecting the stability of the interfaces. One typical example is the rigid glass-ceramic seals, in particular those made from barium-calcium-aluminosilicate (BCAS) base glasses [205-209], FSS interconnect candidates have been shown to react extensively with... 

Other ceramic sealing materials containing calcined colloidal particles are being pursued by the membrane manufacturers as the issue of sealing extremities of a membrane element continues to be one of the important materials selection and engineering challenges for inorganic membranes. 

X-ray diffraction is performed with a X-pert pro MPD powder diffractometer from Panalytical. This latter has been upgraded with the Panalytical X celerator detector for high speed powder XRD measurements. The X-ray source consists in a high energy ceramic sealed tube (1.8 kW). The diffraction data are recorded with the CuKar Ka2 ( -1.54056 A, 1.5444 A) radiation and the incident beam optics is alternatively used with a... 

Fig. 1 also shows that the emitter and the collector are connected by several units. To reduce the heat conduction loss, Ta tubes called heat-chokes are joined to the both electrodes. Ceramic seal rings are used to insulate the electrodes electrically. Two rings are arranged for Cs vapor tube inlet and electrical leads. Each unit is connected by a electron beam welding or a vacuum brazing method. 

Demonstrated a metal-to-ceramic seal that withstands 150 psi pressure differential. 

Although the tubular design reduees signilieantly the issues t5 ieally encountered with sealing, there is still a need to seal the two ends of the tubes in order to avoid potential CO contamination and to enable operation with a pressure differential across the tube. We successfully developed a metal-to-ceramic seal that is leak-free up to 150 psi pressure differential (Figure 3). 

For high-temperature gas separation applications, leak-free sealing of the ITM module components and parts is essential and requires chemically resistant ceramic-metal and ceramic-ceramic seals with similar mechanical, chemical, and expansion characteristics as the membrane material. Little prior art exists for sealing and joining designs for tonnage-quantity ITM modules. ITM ceramics are susceptible to breakage and will have to be joined preferably without any joint interface property difference, possibly as a routine plant maintenance procedure. 

The Ba0-Ca0-Al203-Si02 (BCAS) glass ceramic seal is often used for joining dissimilar materials, i.e. ceramic cells, metallic manifolds and metallic interconnects [2]. The ceramic seal should possess a satisfactory matching of the thermal expansion coefficient with the cells and the chosen alloy and it should also exhibit a long-term stability under the operation conditions. 

If the atmosphere is changed to Ar-H2-H20, a different interaction pattern between steel and glass-ceramic seals can be found. Fig. 7 presents the cross sections of the steel plates covered with glass. 

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