Reactive air brazing

Scott Weilz, K Yong Kim, J. and Hardy, J.S. (2005) Reactive air brazing A novel method of sealing SOFCs and other solid-state electrochemical devices. Electrochemical and Solid-State Letters, 8 (2), 133-136. 

Chen, H Li, L Kemps, R., Michielsen, B., Jacobs, M., Snijkers, F., Middelkoop, V. (2015) Reactive air brazing for sealing mixed ionic electronic conducting hollow fibre membranes, Acta Materialia, 10.1016/j.actamat.2015.01.029 Accepted manuscript. 

Kim, J.Y., Hardy, J.S., and Weil, K.S. (2005) Silver-copper oxide based reactive air braze (RAB) for joining yttria-stabilized zirconia. J. Mater. Res., 20, 636-643. 

While this sealing technique, as all the sealants based on ceramic/glass, is very attractive for laboratory/small-scale applications, a more robust technique has to be applied in order to exploit the MIEC membranes at larger scales. Among the various sealing techniques proposed so far, the reactive air brazing (RAB) seems to be the most appropriate for industrial applications. 

B. Kuhn, F. Wetzel, J. Malzbender, R. Steinbrech, L. Singheiser, Mechanical performance of reactive-air-brazed (RAB) ceramic/metal joints for solid oxide fuel cells at ambient temperature. J. Power Sources 193(1), 199-202 (2009)... 

FeCralloy components that are further reactive using Ag-4 mol% Cu braze alloy at 1020°C for air brazed to alumina tubes, (b and c) 30min. (Reprinted from Ref. [64].)... 

Boron trifluoride, BFj, is a colorless gas with a vapor density of 2.34, which is heavier than air. It is water-soluble and does not support combustion. It is also water-reactive, toxic by inhalation, and corrosive to skin and tissue. The TLV is 1 ppm, and the IDLH is 100 ppm in air. The boiling point is -148°F. The four-digit UN identification number is 1008. The NFPA 704 designation is health 4, flammability 0, and reactivity 1. The primary uses are as a catalyst in organic synthesis, in instruments for measuring neutron intensity, in soldering fluxes, and in gas brazing. 

RAB is carried out in air using binary metallic brazing alloys, whereas a noble metal, such as silver, is used as the major component to prevent oxidation in air, while a reactive element, such as copper, is used as the second component of the... 

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