Processing and oxygenation of YBaCuO melted textured ceramics at high and enhanced pressures and temperatures

Autor:	A. Joulain, V. B. Sverdun, Wolfgang Gawalek, Tobias Habisreuther, Tatiana Prikhna, Sergey Dub, Doris Litzkendorf, Jacques Rabier, Xavier Chaud, Viktor Moshchil
Rok vydání:	2012
Předmět:	Superconductivity Nanostructure Materials science Metallurgy Indentation hardness Inorganic Chemistry Fracture toughness visual_art Phase (matter) visual_art.visual_art_medium General Materials Science Ceramic Composite material Crystal twinning Pinning force
Zdroj:	Journal of Superhard Materials. 34:283-298
ISSN:	1934-9408 1063-4576
DOI:	10.3103/s1063457612050012
Popis:	It has been established that the oxygenation of the structure of YBa2Cu3O7−δ (Y123) textured ceramic materials under elevated pressure (up to 10–16 MPa) and high temperatures (700–900°C) for a relatively short time (72 h) makes it possible to attain the record superconducting (at 77 K in the ab plane of Y123 phase jc ≈ 100 kA/cm2 (0 T), 55 kA/cm2 (2 T) and Hirr 9.5 T) and mechanical (microhardness up to HV = 7.6 GPa and fracture toughness up to KIc = 4.4 MPa·m0.5 under 4.9 N) properties. The high material characteristics have been explained by the formation of a nanostructure from twins acting as pinning centers (the density of twinning being 20–35 m−1) and a considerably smaller amount of microcracks (< 0.2 m−1) as well as by prevention of macrocracking.
Databáze:	OpenAIRE
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