BAS (BaO·Al2O3·SiO2)-glasses for high temperature applications

Characteristics of a SiO2–B2O3–Al2O3–BaCO3–PbO2–ZnO glass–ceramic sealant for SOFCs

“…The requirements for the sealants are stringent due to the high temperature (typically 600-1000 • C) and the very harsh environments (oxidizing, reducing and humid) [4]. The sealing materials must obey some strict requirements [5,6]: including gas tightness, high stability to the fuel and cell components, electrically insulating, a thermal expansion coefficient matching other main SOFC materials, a suitable viscosity and good adherence to the components (mainly stainless steel, electrolyte and anode cermet). The detailed requirements are as follows [7]:…”

Chemical compatibility between MgO–SiO2–B2O3–La2O3 glass sealant and low, high temperature electrolytes for solid oxide fuel cell applications

“…Higher temperature and longer time 10 i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 3 7 ( 2 0 1 2 ) 1 7 2 3 5 e1 7 2 4 4 required for a glass to devitrify means high devitrification resistance of that glass [48e50,32]. In addition to this, MgO has been used as network modifier in present glass, which is also crystallization inhibitor [51].…”

Stored CO2 and Methane Leakage Risk Assessment and Monitoring Tool Development: CO2 Capture Project Phase 2 (CCP2)

“…Uncontrolled crystallization during the initial sintering process can lead to the formation of a porous sealing layer that can adversely affect the SOFC operation. The joining process also requires the sealant to flow to the edge of the seal, which generally favors a slowly crystallizing glass [15]. In addition, the viscous flow of glass can reduce the thermal stress generated by the thermal cycling during the routine SOFC operation and so preventing full crystallization may be advantageous.…”