Viscosity of Ba–B–Si–Al–O glass measured by indentation creep test at operating temperature of IT-SOFC

Viscosity of a specific Ba–B–Si–Al–O glass used for intermediate-temperature solid oxide fuel cell was measured using indentation creep tests. Responses of shear strain to corresponding shear stress at the operating temperature of solid oxide fuel cell were analyzed, and the results revealed that the glass system possesses Newtonian flow behavior at 600–630 °C. In addition, the stress exponent and the activation energy for viscous flow at different temperatures and stresses were also determined. Finally, the absolute-rate theory was adopted to describe the viscous flow for the glass. The results were compared with other glass systems.

Research Highlights
► Viscosity of a specific Ba–B–Si–Al–O glass was measured using indentation creep tests.
► The glass system possesses creep test, showing Newtonian flow behavior at 600–630 °C.
► The stress exponent is nearly 1.0 and the activation energy of the glass flow is 442–445 kJ mol−1.