Evaluation of Elastic and Strength Properties of Ni-YSZ Cermets for Solid Oxide Fuel Cells Under Redox Cycling

Abstract

The effects of pore volume in Ni-YSZ cermets on their mechanical properties under redox cycling were examined using a small punch (SP) testing method. The volume fractions of pores Vp in as-sintered NiO-YSZ specimens were in the range of 0-30%, and with the Ni/YSZ mixture ratio of 50:50%. All the measurements were conducted at 800 C. For Vp>20%, the measured Young’s modulus and strength of re-oxidized NiO-YSZ cermets were almost close to those of the as-sintered cermets. The experimental result indicates that the appropriate selection of Vp is necessary for ensuring the mechanical properties during redox cycling.

Influence of temperature and atmosphere on the strength and elastic modulus of solid oxide fuel cell anode supports

“…The materials tested in Refs. [7], [15] and [22] are NiO-8YSZ, NiO-YSZ/8YSZ and NiO-8YSZ respectively.…”

“…[19,20]. Hashida et al [21,22] also showed that plastic deformations occurred before fracture in their Ni-YSZ cermet given a sufficient slow loading rate.…”