METHOD OF MANUFACTURING ARTICLES FROM HIGH-TEMPERATURE SUPERCONDUCTING CERAMICS Russian patent published in 2005 - IPC

FIELD: ceramics.

SUBSTANCE: invention relates to deformational treatment of materials and can be used in manufacture of articles, including solid ones and those from high-temperature superconducting ceramics having high current-conducting capacity in the form of disk, ring, stick, tube, sheet, and tape, which are employed in power accumulators, magnetic levitation devices, cryogenic electric motors, accelerators, magnetic screens, and current leads. Manufacture method for these articles comprises plastic deformation of blank having platy microstructure with degree of deformation ensuring formation of sharp crystallographic texture with desired orientation of basal planes of grains. Deformation is performed at temperature within the range T*<T<T_lim (T* is temperature of the commencement of macroscopic grain-boundary creep and T_lim limiting temperature determined by permissible level of irreversible degradation of principal phase of high-temperature superconducting ceramics under deformation conditions) and deformation rate preventing dynamic recrystallization development within selected temperature range. Deformation of blank is performed by a method selected taking into account shape of article. Deformation rate is selected within a range from 10^-6 to 10^-3 s^-1.

EFFECT: optimized deformational treatment parameters.

16 cl, 7 dwg, 1 tbl, 8 ex