Simplified CeO2/LaZrO3 composite separating layer used for second generation high temperature superconductive tapes and its preparation method

Abstract

The invention provides a simplified CeO2 / LaZrO3 composite separating layer used for a second generation high temperature superconductive tapes and its preparation method. According to the invention, a simplified CeO2 / LaZrO3 double layers composite separating layer structure replaces a complex CeO2 / YSZ / CeO2 and CeO2 / YSZ / Y2O3 three layers composite separating layer, and a multichannel laser plated film technology replaces a traditional reacting direct current magnetron sputtering technology for preparing a composite separating layer structure on a Ni-W metal substrate. The invention has the advantages of stability, repeatability and reliability. The chemical property of the obtained CeO2 / LaZrO3 composite separating layer is stable, and has the characteristics of single(001) orientation, small thickness error and good surface fineness. A rare earth oxide superconducting layer (REBCO) prepared on the composite separating layer has superior superconductive performance, and is capable of satisfying the requirement for manufacturing a superconductive electric power device.

Description

technical field [0001] The invention relates to the field of novel oxide high-temperature superconductors, in particular to a simplified CeO for the second-generation high-temperature superconducting strips 2 / LaZrO 3 Composite isolation layer and preparation method thereof. Background technique [0002] The basic price of the second-generation high-temperature superconducting strip is mainly composed of three parts: the metal base strip, the composite isolation layer and the superconducting layer. Among them, the role of the soft metal base band is to support the rare earth oxide superconducting layer so as to obtain the excellent mechanical properties required for the manufacture of various superconducting power devices. The metal base belt mainly uses nickel base alloy belt. [0003] When the rare earth oxide (REBCO) superconducting layer is prepared on the biaxially textured nickel-tungsten alloy substrate, the superconductivity will be destroyed due to the chemical i...

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Problems solved by technology

In addition, there are still the following disadvantages in the preparation of oxide composite isolation layers by reactive magnetron sputtering: (1) The utilization rate of the target is low, and only the target corresponding to the circular magnetic field distributed along the ellipse is sputtered onto the metal substrate, accounting for The entire target volume is less than 50%

(2) When the composite oxide isolation layer is prepared by magnetron sputtering, the heater in the coating equipment has a short service life due to the high temperature of the metal baseband substrate required

(3) The bonding force of the oxide layer prepared by magnetron sputtering method is weak, and sometimes peeling or even peeling off occurs

(4) Huge equipment

Not only the equipment is expensive, but also the vacuuming time is longer each time, which affects the production efficiency

(5) The yield is low

When the composite oxide isolation layer is prepared by magnetron sputtering technology, it is easy to form (001) + (111) mixed orientation, which will deteriorate the superconductivity of the high-temperature superconducting tape and affect the yield, which is not conducive to the reduction of the high-temperature superconducting tape. cost

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