Multi-channel laser coating method for preparing ceo2 seed layer

Abstract

The invention discloses a multi-channel laser coating method for preparing a cerium dioxide seed layer. According to the invention, a multi-channel transmission device is adopted; the cerium dioxide seed layer is prepared on an annealed nickel-tungsten metal base band through a multi-channel laser evaporation coating method; in the coating process, the coating speed of the cerium dioxide seed layer on the base band is greatly accelerated through winding repeatedly the nickel-tungsten metal base band on a roll shaft and passing through a coating region, can reach over one hundred meters per hour and is suitable for kilometer-level long band preparation; the atmosphere adopted when the method is used for coating is a mixed gas of argon and hydrogen, the argon is am inert gas and mainly plays a buffer function, and the hydrogen has the main function of consuming residual oxygen in the coating cavity in the coating process, so that baseband surface oxidation which can be generated under the condition of high-temperature coating and affects the orientation of the cerium dioxide seed layer is avoided; in addition, the coating atmosphere is the mixed gas of argon and hydrogen so that therequirement on base vacuum degree of a coating system can be greatly reduced, the equipment investment is saved, and the band material cost is reduced.

Description

technical field [0001] The invention relates to the field of second-generation rare earth oxide high-temperature superconducting tapes, in particular to a method for preparing CeO on nickel-tungsten metal base tapes. 2 Multi-channel laser coating method for seed layer. Background technique [0002] When the rare earth oxide (REBCO) superconducting layer is prepared with a biaxially textured nickel-tungsten alloy as the baseband, chemical interdiffusion will occur between the nickel-tungsten metal baseband and the REBCO superconducting layer, thereby destroying the superconductivity. The superconducting layer cannot be plated directly on the metal substrate. The solution that has been proved by experiments is to first coat a layer of oxide isolation layer with very stable chemical properties on the metal substrate, and then coat the rare earth oxide superconducting layer. The oxide isolation layer is a three-layer composite structure (cap layer / buffer layer / seed layer), suc...

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Problems solved by technology

When using these two methods, there are the following disadvantages: (1) Due to the high temperature of the metal baseband substrate required, it is easy to form a very thin nickel oxide layer on the surface of the metal baseband

Therefore, when these two methods are used to prepare kilometer-level long belts, there will be errors in the thickness of the seed layer at the beginning and end.

In addition, since the preparation process of the superconducting layer is very sensitive to the thickness of the seed layer, the deviation of the thickness of the seed layer will affect the stability of the coating process of the superconducting layer, and further deteriorate the uniformity of the superconducting properties of the high-temperature superconducting strip.

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