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A method for preparing bi-2212 precursor powder by tilting and rotating sintering method

A technology of bi-2212 and tilt rotation, which is applied in chemical instruments and methods, bismuth compounds, inorganic chemistry, etc., can solve the problems of complex reaction of quinary compounds, great difficulty of quinary compounds, and reduction of grain oxygen partial pressure, etc., to achieve Effects of reducing atmosphere differences, promoting consistency, and accelerating dispersion rate

Active Publication Date: 2021-09-03
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
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  • Application Information

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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

Method used

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  • A method for preparing bi-2212 precursor powder by tilting and rotating sintering method
  • A method for preparing bi-2212 precursor powder by tilting and rotating sintering method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment includes the following steps:

[0043] Step 1. Put Bi 2 o 3 , Ca(OH) 2 , SrCO 3 and CuO are prepared into mixed powder according to the atomic ratio of Bi:Sr:Ca:Cu=1.95:1.95:0.9:1.95;

[0044] or Bi 2 o 3 , Ca(OH) 2 , SrCO 3 Mix with CuO according to the atomic ratio of Bi:Sr:Ca:Cu=(1.95~2.2):(1.95~2.2):(0.9~1):(1.95~2.2), and then prepare a nitrate mixed solution, and then use straw salt co-precipitation method to prepare oxalate mixed powder;

[0045] Step 2. Put the mixed powder obtained in step 1 into the raw material powder storage tank 1-1 of the primary sintering furnace 1 in the inclined continuous rotation automatic sintering equipment as raw material powder, respectively raise the temperature of the primary sintering furnace 1 to 450°C, and sinter at a low temperature. Furnace 2 is heated to 600°C, medium-temperature sintering furnace 3 is heated to 700°C, high-temperature sintering furnace 4 is heated to 800°C, and phase forming sinte...

Embodiment 2

[0048] This embodiment includes the following steps:

[0049] Step 1. Put Bi 2 o 3 , Ca(OH) 2 , SrCO 3 and CuO are prepared into mixed powder according to the atomic ratio of Bi:Sr:Ca:Cu=2.2:2.2:1:2.2;

[0050] Step 2. Put the mixed powder obtained in step 1 into the raw material powder storage tank 1-1 of the primary sintering furnace 1 in the inclined continuous rotation automatic sintering equipment as raw material powder, respectively raise the temperature of the primary sintering furnace 1 to 500°C, and sinter at a low temperature. Furnace 2 is heated to 650°C, medium-temperature sintering furnace 3 is heated to 750°C, high-temperature sintering furnace 4 is heated to 820°C, and phase-forming sintering furnace 5 is heated to 850°C and kept for 30 minutes. The furnace tubes 1-15 of the sintering furnace 2, the medium-temperature sintering furnace 3, the high-temperature sintering furnace 4, and the phase-forming sintering furnace 5 are inclined along the feeding direct...

Embodiment 3

[0053] This embodiment includes the following steps:

[0054] Step 1. Put Bi 2 o 3 , Ca(OH) 2, SrCO 3 Mix with CuO according to the atomic ratio of Bi:Sr:Ca:Cu=2:2:0.95:2, then prepare a nitrate mixed solution, and then adopt the oxalate coprecipitation method to prepare an oxalate mixed powder;

[0055] Step 2. Put the oxalate mixed powder obtained in step 1 into the raw material powder storage tank 1-1 of the primary sintering furnace 1 in the inclined continuous rotation automatic sintering equipment as raw material powder, and raise the temperature of the primary sintering furnace 1 to 470°C respectively , Low-temperature sintering furnace 2 is heated to 620°C, medium-temperature sintering furnace 3 is heated to 720°C, high-temperature sintering furnace 4 is heated to 810°C, and phase-forming sintering furnace 5 is heated to 840°C and kept for 30 minutes, and then the primary sintering furnace after heat preservation is sequentially 1. The furnace tubes 1-15 of the low...

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Abstract

The invention discloses a method for preparing Bi-2212 precursor powder by a tilting rotation sintering method. The method comprises the following steps: 1. Bi 2 o 3 , Ca(OH) 2 , SrCO 3 Mixed powder or oxalate mixed powder with CuO; 2. Put the mixed powder or oxalate mixed powder into the inclined continuous rotating automatic sintering equipment, and carry out continuous sintering under the condition that the furnace tubes of each sintering furnace are inclined and rotated. Stepwise heating and sintering to obtain Bi‑2212 precursor powder. The invention adopts the inclined continuous rotation sintering method to carry out segmental heating sintering, so that the corresponding treatment powder is evenly and continuously distributed in the furnace tube, effectively reducing the thickness of the treatment powder in each sintering process, and facilitating the diffusion of the external atmosphere into the treatment powder. It avoids impurity phases generated by the treatment powder at the bottom or center of the treatment powder pile during sintering due to being in a low-oxygen atmosphere, and improves the quality of the Bi-2212 precursor powder.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G29/00C04B35/453C04B35/626C04B35/64
CPCC01G29/006C04B35/453C04B35/62605C04B35/64C04B2235/3208C04B2235/3213C04B2235/3281C04B2235/661
Inventor 郝清滨李成山焦高峰徐晓燕刘国庆郑会玲白利锋金利华张胜楠马小波李高山贾佳林熊晓梅冯建情
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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