Method for preparing high temperature superconductor thick film of Ba/YCu with large area by using electrophoresis technique
A high-temperature superconducting, large-area technology, applied in the manufacture/processing of superconductor devices, electrophoretic plating, electrolytic coatings, etc., can solve problems such as quality degradation, slow growth rate, and deviation of film composition, and achieve uniform and dense texture and low cost. Inexpensive, easy thickness effect
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Embodiment 1
[0018] Embodiment 1: prepare YBa on the MgO substrate of 10mm * 10mm 2 Cu 3 o 7-δ superconducting thick film.
[0019] This example uses the figure 1 For the electric pool shown in , a 10mm×10mm×0.5mm MgO substrate was pre-evaporated with a layer of Ag. In the first step, 2.45 g of YBa 2 Cu 3 o 7-δ powder, fully ground to make the particle size less than 2μm, and then the ground YBa 2 Cu 3 o 7-δ The powder is mixed with 125-1000 milliliters of acetone (purity 99.99%), stirred with a glass rod and then poured into an electric pool. In the second step, the metal silver with a thickness of 0.3 mm, a width of 1.5 cm, and a length of 5 cm is cleaned as the positive and negative electrodes of the battery. The lower end and sides of the negative electrode are bent to fix the substrate, and the Ag-plated MgO substrate is fixed on the negative electrode. In the third step, 900 volts of direct current is applied to the electrodes and maintained for 10 minutes. A layer of YBa...
Embodiment 2
[0020] Embodiment 2: prepare YBa on the MgO large substrate of 150mm * 150mm 2 Cu 3 o 7-δ superconducting thick film.
[0021] This example uses the figure 1 electric swimming pool. The method is similar to that of Example 1, and a layer of Pt is evaporated on the MgO substrate in advance. Electric swimming pool is identical with embodiment 1, YBa 2 Cu 3 o 7-δ The particle size of the powder is less than 0.5 μm, and the electrophoresis solvent uses chloroform. Fix the Pt-coated MgO substrate on the negative electrode, pass a voltage of 900 volts between the positive and negative electrodes, and keep it for 30 minutes. A layer of YBa with a thickness of about 800nm is deposited on the substrate 2 Cu 3 o 7-δ membrane. Will deposit good YBa 2 Cu 3 o 7-δ The film is placed in a sintering furnace. The temperature of the furnace is raised to 1080°C at a rate of 300-400°C / hour, and kept for half an hour, and then dropped to 990°C at a rate of 300°C / hour. hour speed ...
Embodiment 3
[0022] Embodiment 3: A YBCO thin film is grown on a textured nickel sheet, and MgO is used as an isolation layer.
[0023] This example uses figure 1 electric swimming pool. The method is similar to that of Example 1. First, a dense and uniform magnesium oxide film (made according to Chinese patent application number: NO.01110033.8) is prepared, and a layer of Al is steamed on the MgO substrate. Electric swimming pool is identical with embodiment 1, YBa 2 Cu 3 o 7-δ The powder particle size is less than 8μm. Fix Al / MgO / Ni on the negative electrode, pass a voltage of 900 volts between the positive and negative electrodes, and keep it for 10 minutes. A layer of YBa with a thickness of about 17 μm is deposited on the substrate. 2 Cu 3 o 7-δ . Will deposit good YBa 2 Cu 3 o 7-δ The film is placed in a sintering furnace, and the furnace temperature is raised to 1050°C at a rate of 300-400°C / hour, and kept for half an hour, and then dropped to 990°C at a rate of 300°C / ho...
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