High critical current density MgB2-base super conductor and producing method thereof
A current density, superconductor technology, applied in cable/conductor manufacturing, usage of superconductor elements, manufacturing/processing of superconductor devices, etc., can solve the problems of lack of effective pinning centers, low critical current density, weak magnetic flux pinning, etc. , to achieve the effect of improving magnetic flux pinning, high critical current density, and low-cost preparation
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example 1
[0018] Mix dry magnesium (99%), boron (99%), zirconium (99%) and carbon (99%) powders thoroughly according to the ratio of atomic ratio Mg:Zr:B:C=0.95:0.05:1.95:0.05 2 Hour. The mixed powder is pressed into a block with a diameter of 20mm by a hydraulic press, and the applied pressure is 20MPa, then placed in a vacuum annealing furnace, and vacuumed at room temperature until the vacuum degree reaches 10 -3 Pa filled with pure argon or a mixture of argon and hydrogen, and then the wire was heated at a heating rate of not less than 60°C / min, kept at a temperature of 740°C for 10 hours, and finally at a temperature of not lower than 25°C / min. The minute cooling rate cools the sheet or block to room temperature, and the superconducting transition temperature is 38.6K, and the critical current density is 4.1×10 4 A / cm 2 (20K, 4T) MgB 2 base superconductor.
example 2
[0020] Dry magnesium (99%), boron (99%), zirconium (99%) and carbon (99%) powders were thoroughly mixed according to the ratio of atomic ratio Mg:Zr:B:C=0.9:0.1:1.9:0.11 Hour. The mixed powder is pressed into a sheet with a diameter of 20mm by a hydraulic press, and the applied pressure is 80MPa, then placed in a vacuum annealing furnace, and vacuumed at room temperature until the vacuum degree reaches 10 -3 Pa filled with pure argon or a mixture of argon and hydrogen, then heat the sheet or block at a heating rate not lower than 60°C / min, keep it at 760°C for 1 hour, and finally heat it at a temperature not lower than The wire is cooled to room temperature at a cooling rate of 25°C / min, and the superconducting transition temperature is 37.2K, and the critical current density is 5.2×10 4 A / cm 2 (20K, 4T) MgB 2 base superconductor.
example 3
[0022]The dry magnesium (99%), boron (99%), zirconium (99%) and carbon (99%) powders were thoroughly mixed according to the ratio of atomic ratio Mg:Zr:B:C=0.8:0.2:1.8:0.2 1.5 Hour. The mixed powder is pressed into a sheet with a diameter of 20mm by a hydraulic press, and the applied pressure is 60MPa, then placed in a vacuum annealing furnace, and vacuumed at room temperature until the vacuum degree reaches 10 -3 Pa filled with pure argon or a mixture of argon and hydrogen, and then the wire was heated at a heating rate of not less than 60°C / min, kept at a temperature of 750°C for 6 hours, and finally at a temperature of not lower than 25°C / min. The minute cooling rate cools the sheet or block to room temperature, and the superconducting transition temperature is 35.3K, and the critical current density is 2.0×10 4 A / cm 2 (20K, 4T) MgB 2 base superconductor.
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