TY - GEN
T1 - Fracture toughness and slow crack growth behavior of Ni-YSZ and YSZ as a function of porosity and temperature
AU - Radovic, M.
AU - Lara-Curzio, E.
AU - Nelson, G.
PY - 2006
Y1 - 2006
N2 - In this paper we report on the fracture toughness of YSZ and Ni-YSZ and slow-crack growth behavior of Ni-YSZ at 20°C, 600°C and 800°C. Results are presented for tests carried-out in air for YSZ and in a gas mixture of 4%H2 and 96%Ar for Ni-YSZ containing various levels of porosity. The double-torsion test method was utilized to determine the fracture toughness from the peak load obtained during fast loading test specimens that had been precracked, while crack velocity versus stress intensity curves were obtained in the double-torsion using the load relaxation method. It was found that fracture toughness of these materials decreases with temperature and in the case of Ni-YSZ it also decreases with increasing porosity. The effect of temperature and microstructure, which was characterized by Scanning Electron Microscopy, on the fracture behavior of these materials, is discussed.
AB - In this paper we report on the fracture toughness of YSZ and Ni-YSZ and slow-crack growth behavior of Ni-YSZ at 20°C, 600°C and 800°C. Results are presented for tests carried-out in air for YSZ and in a gas mixture of 4%H2 and 96%Ar for Ni-YSZ containing various levels of porosity. The double-torsion test method was utilized to determine the fracture toughness from the peak load obtained during fast loading test specimens that had been precracked, while crack velocity versus stress intensity curves were obtained in the double-torsion using the load relaxation method. It was found that fracture toughness of these materials decreases with temperature and in the case of Ni-YSZ it also decreases with increasing porosity. The effect of temperature and microstructure, which was characterized by Scanning Electron Microscopy, on the fracture behavior of these materials, is discussed.
UR - http://www.scopus.com/inward/record.url?scp=33845959869&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33845959869
SN - 047008054X
SN - 9780470080542
T3 - Ceramic Engineering and Science Proceedings
SP - 373
EP - 381
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 -