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The technology of laser welding of high temperature superconducting ceramics Bi(2223) was developed and investigated. CW CO2 laser (λ = 10.6 µm) with maximum power of 100 W was used as a source of laser radiation. Then thermal annealing was applied for Bi(2223) phase repairing. Microstructure, chemical and phase composition of material in the welded field were investigated. Properties of HTSC ceramics were fully repaired (T c ≈ 110 K) at optimal conditions of laser welding and thermal annealing. Proposed method opens wide capabilities for formation the reliable mechanical and electrical contacts between different constructive elements of HTSC ceramics devices having large dimensions or complex shape. 2 3 4Block-scheme of the setup for laser welding of HTSC ceramics.

Experimental data are summarized on the optimization of the performance of YBa 2 Cu 3 O 7x , Bi 2 Sr 2 CaCu 2 O 8 + δ , and (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10 + δ high-T c ceramics by producing structural defects via irradiation or doping with metals and different inorganic compounds. A classification of additions is proposed according to their interaction with the superconductors. For additions having an advantageous effect on the superconducting and mechanical properties of the high-T c materials, the optimum concentration and size ranges are indicated. S92 INORGANIC MATERIALS Vol. 40 Suppl. 2 2004 MIKHAILOV et al .c ^ s ^ z ^

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