Superconducting oxide material, process for producing the same, and superconducting wire and superconduction apparatus both employing the superconducting material

A technology of superconducting materials and superconducting devices, which are used in superconducting/high-conducting conductors, chemical instruments and methods, cable/conductor manufacturing, etc.

Inactive Publication Date: 2009-04-01
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, "Ic" also increases

Method used

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  • Superconducting oxide material, process for producing the same, and superconducting wire and superconduction apparatus both employing the superconducting material
  • Superconducting oxide material, process for producing the same, and superconducting wire and superconduction apparatus both employing the superconducting material
  • Superconducting oxide material, process for producing the same, and superconducting wire and superconduction apparatus both employing the superconducting material

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Experimental program
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Effect test

Embodiment approach

[0042] Usually, the adjustment of the ratio of the cation components (Bi, Pb, Sr, Ca, and Cu) contained in the superconducting material is performed at the material mixing stage. For example, when a ratio such as Bi:Pb:Sr:Ca:Cu=1.8:0.3:2.0:2.0:3.0 shows the composition of the predetermined final superconducting phase, the oxide or carbon of the individual components is mixed in a ratio close to the above ratio salt. Then, the heat treatment is repeated to obtain a final superconducting material having a composition ratio close to the ratio of the raw materials.

[0043] In the above production method, it is sometimes difficult to obtain a (Bi, Pb)-2223 phase having a predetermined composition ratio. For example, in the case where the ratio Bi:Pb:Sr:Ca:Cu=1.8:0.3:2.0:2.0:3.0 is the composition ratio of the predetermined final composite, when using a conventional procedure with simple mixing and heat treatment, it will mainly A Sr-deficient phase such as a superconducting phas...

Embodiment

[0065] The present invention is explained more specifically based on an example below.

[0066] Example

[0067] The material powder (Bi 2 o 3 , PbO, SrCO 3 , CaCO 3 and CuO) in the ratio Bi:Pb:Sr:Ca:Cu=1.8:0.3:2.0:2.0:3.0. In air, the mixed powder was processed to obtain a precursor powder by heating at 700°C for 8 hours, crushing, heating at 800°C for 10 hours, crushing, heating at 840°C for 4 hours, and crushing. Alternatively, the precursor powders can also be fabricated using the multifilamentary masters described below. A nitric acid solution in which powders of the five types of materials were dissolved was sprayed into a hot melting furnace, thereby evaporating the water in the droplets of the metal nitrate solution. Then, the pyrolysis of nitrates and the reaction and synthesis between metal oxides occur instantaneously to form precursor powders. The precursor powder produced by the above method is a powder mainly formed of a (Bi, Pb)-2212 phase or a Bi-2212 ph...

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Abstract

A process for producing a (Bi,Pb)2Sr2Ca2Cu3Oz superconducting oxide material which comprises a step in which raw materials are mixed and two or more heat treatment steps in which the mixed materials are heat-treated. The heat treatment steps comprise a first heat treatment step in which (Bi,Pb)-2223 crystals are formed and a second heat treatment step in which after the formation of the (Bi,Pb)-2223 crystals, the strontium content in the (Bi,Pb)-2223 crystals is heightened. The second heat treatment step is conducted at a lower temperature than the first heat treatment step. Thus, a (Bi,Pb)-2223 type superconducting oxide material having a high critical temperature is obtained.

Description

technical field [0001] The present invention relates to a kind of (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 o z ("z" is a number close to 10, and is hereinafter referred to as (Bi, Pb)-2223)-based oxide superconducting material, its manufacturing method, and all containing the (Bi, Pb)-2223-based oxide Superconducting materials are superconducting wires and superconducting devices as their main phase. Background technique [0002] An oxide superconducting wire having a (Bi, Pb)-2223 phase as a main component and manufactured by a metal sheath method is a useful wire because it is It also exhibits not only a high critical temperature but also a high critical current value (for example, see Non-Patent Document 1). However, when its performance is further improved, its practical application range will be further expanded. Therefore, it is desired to improve the performance of the (Bi, Pb)-2223-based superconducting material itself which is the main phase of the wire. [0003] In additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/10C01G1/00
CPCH01L39/248C01P2006/40C01P2002/52C01G29/006H10N60/0801
Inventor 下山淳一加藤武志山崎浩平小林慎一
Owner SUMITOMO ELECTRIC IND LTD
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