TY - GEN
T1 - Effect of thermal cycling and thermal aging on the mechanical properties of, and residual stresses in, Ni-YSZ/YSZ bi-layers
AU - Lara-Curzio, E.
AU - Radovic, M.
AU - Trejo, R. M.
AU - Cofer, C.
AU - Watkins, T. R.
AU - More, K. L.
PY - 2006
Y1 - 2006
N2 - In this paper we report the effect of thermal cycling, between 20°C and 800°C in a gas mixture of 4% H2 and 96%Ar, on the physical and mechanical properties of Ni-YSZ/YSZ bilayers. It was found that the porosity and Young's modulus of the bi-layers did not change significantly after thermal cycling. However, the characteristic biaxial strength, as determined by the ring-on-ring test method, was found to decrease by as much as 15% after 1250 thermal cycles. Similar trends were observed from the evaluation of test specimens that had been thermally aged in a similar environment at 800°C for 625 hours. It was also found that the magnitude of the compressive residual stress in the YSZ layer changes significantly during thermal cycling and aging. Potential mechanisms responsible for this behavior are discussed.
AB - In this paper we report the effect of thermal cycling, between 20°C and 800°C in a gas mixture of 4% H2 and 96%Ar, on the physical and mechanical properties of Ni-YSZ/YSZ bilayers. It was found that the porosity and Young's modulus of the bi-layers did not change significantly after thermal cycling. However, the characteristic biaxial strength, as determined by the ring-on-ring test method, was found to decrease by as much as 15% after 1250 thermal cycles. Similar trends were observed from the evaluation of test specimens that had been thermally aged in a similar environment at 800°C for 625 hours. It was also found that the magnitude of the compressive residual stress in the YSZ layer changes significantly during thermal cycling and aging. Potential mechanisms responsible for this behavior are discussed.
UR - http://www.scopus.com/inward/record.url?scp=33845952064&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33845952064
SN - 047008054X
SN - 9780470080542
T3 - Ceramic Engineering and Science Proceedings
SP - 383
EP - 391
BT - Advances in Solid Oxide Fuel Cells II - A Collection of Papers Presented at the 30th International Conference on Advanced Ceramics and Composites
T2 - Advances in Solid Oxide Fuel Cells II - 30th International Conference on Advanced Ceramics and Composites
Y2 - 22 January 2006 through 27 January 2006
ER -