Alumina–silica glass–ceramic sealants for tubular solid oxide fuel cells

Incorporating sugarcane bagasse ash into Al2O3 ceramic tapes

“…This fact is related to the SCBA waste being a less inert material than Al 2 O 3 , and also, due to the presence of oxides (as seen in Table 1), from the ash powder, which allows the formation of a low-melting vitreous phase, reducing the sintering temperature, agreeing well with the literature. 40,41,42 Figure 1D shows a representative image of the green tape and the laminated tape in six layers before the sintering process. We note the excellent flexibility.…”

Non-crystallising glass sealants for SOFC: Effect of Y2O3 addition

“…A further increase in temperature made the bulk glass transform to a viscous-flow state, while the behaviour of the pressed samples remained unchanged up to the softening temperature. The CTE values were calculated from the slope of dilatometric curves assuming their linear character [11]. The concurrence of the CTE of samples with different thermal histories confirms the absence of a significant amount of crystalline phases in the sealant.…”

“…The temperature, at which a glass drop with a good adhesion to the substrate had formed (contact angle < 90°) [36], was taken to be the sealing temperature; the accuracy of temperature set was ± 5°C. The sealing temperature was determined by the shape of a drop: a detailed description is given elsewhere [11].…”

“…In this work, we aimed to develop sealing materials for SOFCs of a tubular construction, the details of which can be found in [11]. The unit element was designed after the investigation of the sealing and interaction processes of the glasses with a ceramic electrolyte and an interconnect material.…”

“…The formation of crystalline phases results in mechanical stresses due to a difference in molar volumes and a change in the CTE of a glass sealant, thus leading to cracking of the cell. In most cases, crystallisation during sealing or exposure at operating temperatures cannot be avoided, a fact which explains the popularity of glass-ceramic sealants among researchers [7][8][9][10][11]. At the same time, non-crystallising sealants have received little attention.…”