H - Electricity – 01 – L
Patent
H - Electricity
01
L
H01L 39/24 (2006.01) C04B 35/45 (2006.01) C04B 35/622 (2006.01) C04B 35/653 (2006.01)
Patent
CA 2107149
ABSTRACT OF THE DISCLOSURE Method for producing a rotationally symmetrical molded part of a high-temperature superconductor In order in the case of a rotationally symmetrical molded part of a high-temperature superconductor to achieve a critical current density of jc ? 800 A/cm2 at a temperature of 77 K, use is made of a powder mixture (8) having the stoichiometric composition of Bi2+xEA3Cu2Oy where, -0.15 < x < 0.4; EA = an alkaline earth metal or a mixture of alkaline earth metals, in particular a mixture of Sr and Ca in the ratio of Sr : Ca = (2 + z) : (1 - z), where 0 < x < 0.2; 8 ? y ? 8.3. With the aid of a conveying chute (9), the powder mixture (8) is brought uniformly at room temperature with a grain size of < 50 µm into a silver mold (5) which is arranged inside a rotating fusion mold (4), open at one side, in a furnace (3). Subsequently, the fusion mold (4) is accelerated, heated to 500°C and held for approximately 30 min at 500°C. After subsequent partial melting at a temperature of Tm K to Tm + 6 K, where Tm = melting temperature of the pulverulent starting material, for 30 min to 2 h at an oxygen partial pressure of p(02) ? 0.8 bar, a first long-term annealing is performed at 840°C to 850°C for 20 h to 40 h. Thereafter, a second long-term annealing is performed at a reduced oxygen partial pressure of p(O2) and, below 700°C, cooling to room temperature in a nitrogen atmosphere. There can be a subsequent third long-term annealing. (Figure 1)
Baumann Thomas
Unternahrer Peter
Asea Brown Boveri Ltd.
Swabey Ogilvy Renault
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