A preparation method of copper-based/nickel-based composite long base tape for coated conductors

Abstract

The invention discloses a method for preparing a copper-based / nickel-based composite long base strip for a coated conductor, belongs to the field of high-temperature super-conduction coated conductor texturing metal base strips, and particularly relates to a method for preparing a hectometer-grade long composite base strip, which has a sandwich structure, is made of a copper-nickel alloy on an outer layer and is made of a nickel-tungsten alloy on an inner layer. The method comprises the following steps: preparing an NiW alloy billet by adopting a smelting method, performing high-temperature hot forging and descaling, and cutting to obtain an alloy block which is 3-5 centimeters in thickness, 5-10 centimeters in width and 20-30 centimeters in length; inserting the NiW alloy block into a mold, molding a CuNi alloy layer by casting in a vacuum or reducing atmosphere to obtain an original strip type composite cast ingot, and performing hot-rolling cogging, cold rolling, trimming and high-temperature annealing treatment to obtain the hectometer-grade long composite base strip of which the texture content is over 98 percent. The composite base strip prepared by adopting the method has the characteristics of high texture content, no ferromagnetism, high mechanical performance and the like; moreover, the composite base strip is low in cost, is prepared with a simple process, and is more suitable for industrial production.

Description

technical field

[0001] The invention relates to a method for preparing a copper-based / nickel-based composite long baseband for coated conductors, and belongs to the field of high-temperature superconducting coated conductor textured metal basebands. Background technique

[0002] YBCO-coated high-temperature superconducting tapes are usually grown on biaxially textured metal substrates with an isolation layer. Nickel-tungsten alloys and copper-nickel alloys can obtain strong cubic textures after large-scale variable cold rolling and high-temperature recrystallization annealing, and are widely used baseband materials. Studies have shown that by increasing the W content in the alloy, the Ni9.3at.%W (Ni9W for short) alloy is non-ferromagnetic in the liquid nitrogen temperature range, but the volume fraction of the cubic texture in its recrystallized texture decreases sharply. The copper-nickel alloy is also non-ferromagnetic in the application temperature range (77K) when the C...

Examples

example 1

[0018] The NiW alloy billet was obtained by smelting, and then after high-temperature hot forging and descaling, it was cut to obtain an alloy block with a thickness of 3 cm, a width of 8 cm, and a length of 15 cm. After the NiW alloy block is inserted into the mold, the CuNi alloy layer is cast in the mold under vacuum protection, and the original elongated composite ingot with a thickness of 9 cm, a width of 5 cm and a length of 20 cm is obtained after surface treatment. After the 900°homogenization heat treatment, the long composite ingot is hot-rolled with a large deformation of 15% in each pass, the total deformation is 50%, and the hot-rolling temperature is 800°C. Finally, cold rolling, edge trimming and high-temperature annealing treatment are performed to obtain a 100-meter composite long base belt with a thickness of 0.08 mm and a texture content of more than 98%.

example 2

[0020] The NiW alloy ingot was obtained by smelting, and then after high-temperature hot forging and descaling, it was cut to obtain an alloy block with a thickness of 5 cm, a width of 10 cm, and a length of 30 cm. After the NiW alloy block was inserted into the mold, the CuNi alloy layer was cast in the mold under vacuum protection, and the original elongated composite ingot with a thickness of 15 cm, a width of 7 cm and a length of 27 cm was obtained after surface treatment. After the 900°homogenization heat treatment, the long composite ingot is hot-rolled with a large deformation of 30% in each pass, the total deformation is 80%, and the hot-rolling temperature is 1000°C. Finally, cold rolling, trimming and high-temperature annealing are performed to obtain a 200-meter-level composite long base belt with a thickness of 0.08 mm and a texture content of more than 98%.

example 3

[0022] The NiW alloy ingot was obtained by smelting, and then after high-temperature hot forging and descaling, it was cut to obtain an alloy block with a thickness of 3 cm, a width of 8 cm, and a length of 28 cm. After the NiW alloy block is inserted into the mold, the CuNi alloy layer is cast in the mold under vacuum protection, and the original elongated composite ingot with a thickness of 9 cm, a width of 5 cm and a length of 25 cm is obtained after surface treatment. After the 900°homogenization heat treatment, the long composite ingot is hot-rolled with a large deformation of 30% in each pass, the total deformation is 80%, and the hot-rolling temperature is 1000°C. Finally, cold rolling, edge trimming and high-temperature annealing treatment are performed to obtain a 100-meter composite long base belt with a thickness of 0.08 mm and a texture content of more than 98%.

technical field

[0001] The invention relates to a method for preparing a copper-based / nickel-based composite long baseband for coated conductors, and belongs to the field of high-temperature superconducting coated conductor textured metal basebands. Background technique

[0002] YBCO-coated high-temperature superconducting tapes are usually grown on biaxially textured metal substrates with an isolation layer. Nickel-tungsten alloys and copper-nickel alloys can obtain strong cubic textures after large-scale variable cold rolling and high-temperature recrystallization annealing, and are widely used baseband materials. Studies have shown that by increasing the W content in the alloy, the Ni9.3at.%W (Ni9W for short) alloy is non-ferromagnetic in the liquid nitrogen temperature range, but the volume fraction of the cubic texture in its recrystallized texture decreases sharply. The copper-nickel alloy is also non-ferromagnetic in the application temperature range (77K) when the C...

Examples

example 1

[0018] The NiW alloy billet was obtained by smelting, and then after high-temperature hot forging and descaling, it was cut to obtain an alloy block with a thickness of 3 cm, a width of 8 cm, and a length of 15 cm. After the NiW alloy block is inserted into the mold, the CuNi alloy layer is cast in the mold under vacuum protection, and the original elongated composite ingot with a thickness of 9 cm, a width of 5 cm and a length of 20 cm is obtained after surface treatment. After the 900°homogenization heat treatment, the long composite ingot is hot-rolled with a large deformation of 15% in each pass, the total deformation is 50%, and the hot-rolling temperature is 800°C. Finally, cold rolling, edge trimming and high-temperature annealing treatment are performed to obtain a 100-meter composite long base belt with a thickness of 0.08 mm and a texture content of more than 98%.

example 2

[0020] The NiW alloy ingot was obtained by smelting, and then after high-temperature hot forging and descaling, it was cut to obtain an alloy block with a thickness of 5 cm, a width of 10 cm, and a length of 30 cm. After the NiW alloy block was inserted into the mold, the CuNi alloy layer was cast in the mold under vacuum protection, and the original elongated composite ingot with a thickness of 15 cm, a width of 7 cm and a length of 27 cm was obtained after surface treatment. After the 900°homogenization heat treatment, the long composite ingot is hot-rolled with a large deformation of 30% in each pass, the total deformation is 80%, and the hot-rolling temperature is 1000°C. Finally, cold rolling, trimming and high-temperature annealing are performed to obtain a 200-meter-level composite long base belt with a thickness of 0.08 mm and a texture content of more than 98%.

example 3

[0022] The NiW alloy ingot was obtained by smelting, and then after high-temperature hot forging and descaling, it was cut to obtain an alloy block with a thickness of 3 cm, a width of 8 cm, and a length of 28 cm. After the NiW alloy block is inserted into the mold, the CuNi alloy layer is cast in the mold under vacuum protection, and the original elongated composite ingot with a thickness of 9 cm, a width of 5 cm and a length of 25 cm is obtained after surface treatment. After the 900°homogenization heat treatment, the long composite ingot is hot-rolled with a large deformation of 30% in each pass, the total deformation is 80%, and the hot-rolling temperature is 1000°C. Finally, cold rolling, edge trimming and high-temperature annealing treatment are performed to obtain a 100-meter composite long base belt with a thickness of 0.08 mm and a texture content of more than 98%.

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