Effects on residual stresses of annealing parameters in high-temperature ZrO2 insulation coatings on Ag/Bi-2212 superconducting tapes using finite element method

✍ Scribed by Y. Islamoglu; E. Celik; C. Parmaksizoglu; Y.S. Hascicek

• Publisher: Elsevier Science
• Year: 2002
• Weight: 296 KB
• Volume: 23
• Category: Article
• ISSN: 0261-3069
• DOI: 10.1016/s0261-3069(02)00029-8

✦ Synopsis

In the present work, we focus on effects of residual stresses of annealing parameters and fracture behavior in high-temperature ZrO insulation coatings on AgyBi-2212 superconducting tapes using the finite element method. High-temperature ZrO -based 2 2 insulation ceramic coatings were produced on Ag and AgyAgMg sheathed Bi-2212 superconducting tapes by the reel-to-reel solgel technique for magnet technology. The samples produced were characterized using scanning electron microscopy (SEM). These coatings are exposed to thermal loading under several annealing conditions. The residual stresses in 8-mm-thick coatings, as well as changes during thermal cycling, were simulated by finite element analysis (FEA). It was found that the shear stress values of ZrO coatings in the interface were very low, and the maximum shear stress was 47 Pa for 8-mm-thick coatings. It was determined 2 that the highest fracture intensity was 1.09=10 MN m , and the fracture intensity decreased as a function of distance from y4 y3y2

the initial crack.