Title :
Microstructural features and fracture resistance of superconductive ceramics
Author :
Parinov, I.A. ; Rozhkov, E.V. ; Vassilchenko, C.E.
Author_Institution :
Mech. & Appl. Math. Res. Inst., Rostov-on-Don Univ., Russia
fDate :
6/1/1997 12:00:00 AM
Abstract :
Based on the example of the gradient sintered YBa/sub 2/Cu/sub 3/O/sub 7-x/, compositions, a computer microstructural model for crack bridging processes is presented and their effects on the fracture resistance are calculated. Three kinds of restraining bridges are considered namely: elastic connections, frictional ligaments, and tractions due to the thermal expansion anisotropy. Influence of the initial press-powder porosity on the some parameters of crack bridging is evaluated.
Keywords :
barium compounds; ceramics; cracks; crystal microstructure; digital simulation; fracture mechanics; high-temperature superconductors; porosity; powder technology; sintering; thermal expansion; yttrium compounds; YBa/sub 2/Cu/sub 3/O/sub 7/; computer microstructural model; crack bridging; crack bridging processes; elastic connections; fracture resistance; frictional ligaments; gradient sintered YBa/sub 2/Cu/sub 3/O/sub 7-x/; initial press-powder porosity; microstructural features; restraining bridges; superconductive ceramics; thermal expansion anisotropy; tractions; Anisotropic magnetoresistance; Bridges; Ceramics; Crystalline materials; Electric resistance; Ligaments; Magnetic materials; Superconducting materials; Superconductivity; Thermal expansion;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
