Preparation method of high-current-carrying multi-core Bi-2223 superconducting tape under magnetic field

Abstract

The invention discloses a preparation method of a high-current-carrying multi-core Bi-2223 superconducting tape under a magnetic field. The method comprises the following steps: 1, adding Bi-2223 precursor powder and CaCuO2 power into a silver sleeve so as to obtain a first tube loading composite; 2, drawing and assembling the first tube loading composite so as to obtain a second tube loading composite; 3, drawing the second tube loading composite into a multi-core Bi-2223 tape; 4, preserving the heat of the multi-core Bi-2223 tape so as to obtain the pretreated multi-core Bi-2223 tape; and 5,thermally treating the pretreated multi-core Bi-2223 tape so as to obtain a multi-core Bi-2223 superconducting tape. The powder tube loading process improves the Bi-2223 grain orientation and grain boundary quality and improves the grain orientation and bonding properties so that the current carrying capacity of the Bi-2223 superconducting tape under the magnetic field can be enhanced and the application in magnets and other fields can be facilitated.

Description

technical field

[0001] The invention belongs to the technical field of preparation of superconducting materials, and in particular relates to a preparation method of high current-carrying multi-core Bi-2223 superconducting strips under a magnetic field. Background technique

[0002] Bi-2223 strips prepared by powder in-tube method (PIT) are known for their high critical current density (J c ) and the characteristics of easy processing into long strips make it one of the most promising high-temperature superconducting materials that can first realize strong electric applications in the liquid nitrogen temperature region. Its potential applications include power transmission cables, transformers, fault current limiters, motors and electric motors Wait.

[0003] The critical current density of Bi-2223 strip is the most important parameter for its application, especially its engineering current density under magnetic field. Obtaining high-performance Bi-2223 strip will signific...

Examples

Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1. In a glove box with an oxygen partial pressure content of 7.5% and an equilibrium gas of argon gas with a mass purity of 99.995%, use a vibrating table to vibrate the tube under the condition of a vibration frequency of 40Hz, and first introduce the Bi-2223 precursor powder In the metal funnel, start the vibrating table at the same time to vibrate the silver casing, so that the Bi-2223 precursor powder is filled into the gap formed by the inner silver tube and the outer silver tube of the silver casing, and then the CaCuO prepared by the co-precipitation method 2 The powder is filled into the inner silver tube of the silver sleeve. During the vibration filling process, the positions of the inner silver tube and the outer silver tube in the silver sleeve are fixed, and then the inner silver tube is taken out, and the outer silver tube is sealed to obtain the second A tube complex, such as figure 1 As shown; ...

Embodiment 2

[0037] This embodiment includes the following steps:

[0038] Step 1. In a glove box with an oxygen partial pressure content of 7.5% and an equilibrium gas of argon gas with a mass purity of 99.995%, use a vibrating table to vibrate the tube under the condition of a vibration frequency of 40Hz, and first introduce the Bi-2223 precursor powder In the metal funnel, start the vibrating table at the same time to vibrate the silver casing, so that the Bi-2223 precursor powder is filled into the gap formed by the inner silver tube and the outer silver tube of the silver casing, and then the CaCuO prepared by the co-precipitation method 2 The powder is filled into the inner silver tube of the silver sleeve. During the vibration filling process, the positions of the inner silver tube and the outer silver tube in the silver sleeve are fixed, and then the inner silver tube is taken out, and the outer silver tube is sealed to obtain the second A tube complex, such as figure 1 As shown; ...

Embodiment 3

[0045] This embodiment includes the following steps:

[0046] Step 1. In a glove box with an oxygen partial pressure content of 7.5% and an equilibrium gas of argon gas with a mass purity of 99.995%, use a vibrating table to vibrate the tube under the condition of a vibration frequency of 40Hz, and first introduce the Bi-2223 precursor powder In the metal funnel, start the vibrating table at the same time to vibrate the silver casing, so that the Bi-2223 precursor powder is filled into the gap formed by the inner silver tube and the outer silver tube of the silver casing, and then the CaCuO prepared by the co-precipitation method 2 The powder is filled into the inner silver tube of the silver sleeve. During the vibration filling process, the positions of the inner silver tube and the outer silver tube in the silver sleeve are fixed, and then the inner silver tube is taken out, and the outer silver tube is sealed to obtain the second A tube complex, such as figure 1 As shown; ...

technical field

[0001] The invention belongs to the technical field of preparation of superconducting materials, and in particular relates to a preparation method of high current-carrying multi-core Bi-2223 superconducting strips under a magnetic field. Background technique

[0002] Bi-2223 strips prepared by powder in-tube method (PIT) are known for their high critical current density (J c ) and the characteristics of easy processing into long strips make it one of the most promising high-temperature superconducting materials that can first realize strong electric applications in the liquid nitrogen temperature region. Its potential applications include power transmission cables, transformers, fault current limiters, motors and electric motors Wait.

[0003] The critical current density of Bi-2223 strip is the most important parameter for its application, especially its engineering current density under magnetic field. Obtaining high-performance Bi-2223 strip will signific...

Examples

Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1. In a glove box with an oxygen partial pressure content of 7.5% and an equilibrium gas of argon gas with a mass purity of 99.995%, use a vibrating table to vibrate the tube under the condition of a vibration frequency of 40Hz, and first introduce the Bi-2223 precursor powder In the metal funnel, start the vibrating table at the same time to vibrate the silver casing, so that the Bi-2223 precursor powder is filled into the gap formed by the inner silver tube and the outer silver tube of the silver casing, and then the CaCuO prepared by the co-precipitation method 2 The powder is filled into the inner silver tube of the silver sleeve. During the vibration filling process, the positions of the inner silver tube and the outer silver tube in the silver sleeve are fixed, and then the inner silver tube is taken out, and the outer silver tube is sealed to obtain the second A tube complex, such as figure 1 As shown; ...

Embodiment 2

[0037] This embodiment includes the following steps:

[0038] Step 1. In a glove box with an oxygen partial pressure content of 7.5% and an equilibrium gas of argon gas with a mass purity of 99.995%, use a vibrating table to vibrate the tube under the condition of a vibration frequency of 40Hz, and first introduce the Bi-2223 precursor powder In the metal funnel, start the vibrating table at the same time to vibrate the silver casing, so that the Bi-2223 precursor powder is filled into the gap formed by the inner silver tube and the outer silver tube of the silver casing, and then the CaCuO prepared by the co-precipitation method 2 The powder is filled into the inner silver tube of the silver sleeve. During the vibration filling process, the positions of the inner silver tube and the outer silver tube in the silver sleeve are fixed, and then the inner silver tube is taken out, and the outer silver tube is sealed to obtain the second A tube complex, such as figure 1 As shown; ...

Embodiment 3

[0045] This embodiment includes the following steps:

[0046] Step 1. In a glove box with an oxygen partial pressure content of 7.5% and an equilibrium gas of argon gas with a mass purity of 99.995%, use a vibrating table to vibrate the tube under the condition of a vibration frequency of 40Hz, and first introduce the Bi-2223 precursor powder In the metal funnel, start the vibrating table at the same time to vibrate the silver casing, so that the Bi-2223 precursor powder is filled into the gap formed by the inner silver tube and the outer silver tube of the silver casing, and then the CaCuO prepared by the co-precipitation method 2 The powder is filled into the inner silver tube of the silver sleeve. During the vibration filling process, the positions of the inner silver tube and the outer silver tube in the silver sleeve are fixed, and then the inner silver tube is taken out, and the outer silver tube is sealed to obtain the second A tube complex, such as figure 1 As shown; ...

Images