Posted on 20/05/2011

Researchers at Georgia Tech recently published NanoTest data describing the mechanical properties of solid oxide fuel cell glass-ceramic seal material, G18. Hardness, modulus and creep properties were investigated via depth-sensing nanoindentation carried out at room temperature, and then at temperatures of 550, 650 and 750°C.

Results showed a decrease in reduced modulus with increasing temperature, with significant decrease above the glass tranistion temperature, while hardness generally decreased with increasing temperature.

Creep data acquired over 120s at maximum load showed that creep increased with increasing temperature, but then decreased with further aging.

The tip heating used by the NanoTest ensures excellent instrument stability even at these very high temperatures, allowing such creep data to be acquired.

Reference:

Mechanical properties of solid oxide fuel cell glass-ceramic seal at high temperatures, J. Milhans et al, J.Power Sources (2011) doi:10.1016/j.jpowsour.2011.02.033