Title :
Mechanical properties of TSMG-YBCO
Author :
Leenders, A. ; Ullrich, M. ; Freyhardt, H.C.
Author_Institution :
Zentrum fur Funktionswerkstoffe GmbH, Gottingen, Germany
fDate :
6/1/1999 12:00:00 AM
Abstract :
The fracture toughness, K/sub c/, of YBCO prepared by the top-seeded-melt-growth (TSMG) method can be improved by increasing the yttrium content. K/sub c/ increases from 1.01 MPa/spl radic/m for samples with 30 mol % Y/sub 2/Ba/sub 1/Cu/sub 1/O/sub 5/ (Y-211) addition to a value of 1.44(22) MPa/spl radic/m for samples with 60 mol % Y-211 addition. Substituting CeO/sub 2/ for PtO/sub 2/ results in a further enhancement of K/sub c/. In both cases the improvement can be explained by a refinement and homogenization of the distribution of Y-211 particles. The incorporation of ductile particles also contributes to an enhanced fracture toughness of the melt-textured monoliths.
Keywords :
barium compounds; crystal growth from melt; fracture toughness; high-temperature superconductors; melt texturing; stoichiometry; yttrium compounds; Y content dependence; Y-211 addition; Y/sub 2/Ba/sub 1/Cu/sub 1/O/sub 5/ addition; YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/; YBaCuO; ductile particles; fracture toughness; mechanical properties; melt-textured monoliths; particle distribution; top-seeded-melt-growth; Composite materials; Energy storage; High temperature superconductors; Mechanical factors; Optical microscopy; Powders; Scanning electron microscopy; Stress; Superconducting materials; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
