Method for preparing Bi-2212 precursor powder by inclined rotary sintering process

Abstract

The invention discloses a method for preparing Bi-2212 precursor powder through an inclined rotary sintering process. The method comprises the following steps: step 1, preparing Bi2O3, Ca(OH)2, SrCO3and CuO into mixed powder or oxalate mixed powder; and step 2, filling an inclined continuous rotation automatic sintering device with the mixed powder or the oxalate mixed powder, carrying out continuous segmented heating sintering under the condition that furnace tubes of all sintering furnaces are inclined and rotate so as to obtain the Bi-2212 precursor powder. According to the invention, theinclined continuous rotary sintering process is adopted for segmented heating sintering, and corresponding treatment powder is uniformly and continuously distributed in the furnace tubes, so the thickness of the treatment powder in each sintering process is effectively reduced; the diffusion of an external atmosphere into the treatment powder can be easily realized; the generation of an impurity phase due to the fact that the treatment powder located at the bottom part or the center of a treatment powder pile in the sintering process is located in a low-oxygen atmosphere is avoided; and the quality of the Bi-2212 precursor powder is improved.

Description

technical field [0001] The invention belongs to the technical field of preparing Bi-2212 superconducting wire strips, and in particular relates to a method for preparing Bi-2212 precursor powder by a tilted rotation sintering method. Background technique [0002] Bi-2212 high temperature superconductor (Bi 2 Sr 2 CaCu 2 o x ) is the most important branch of high-temperature superconducting materials. Due to its easy processing and high current-carrying performance, Bi-2212 wire has become one of the most promising high-temperature superconducting materials. The quality of Bi-2212 precursor powder has a decisive effect on the current-carrying performance of Bi-2212 wire. The standard of high-quality Bi-2212 precursor powder is: high-purity Bi-2212 phase powder, small and uniform particle size, as little as possible impurity and impurity. High-quality Bi-2212 precursor powder puts forward high requirements for powder preparation technology. [0003] The reactions of qui...

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Problems solved by technology

[0003] The reactions of quinary compounds are complex, and it is very difficult to prepare high-purity quinary compounds

However, for the powder grains at the bottom or center of the powder pile, the problem of oxygen partial pressure reduction around the grains will also occur during the heating process, but these powders are far away from the surface of the powder pile, and the external gas needs to be supplemented with oxygen, which needs to be diffused more. For a long time, the powder is kept in a low-oxygen atmosphere for a long time, resulting in the appearance of impurity phases in the powder at this position, which has a great impact on the quality of the powder

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