Method for producing carbon doped MgB2 cryogenic conductor by step-by-step sintering reaction
A step-by-step sintering and superconductor technology, applied in the usage of superconductor elements, etc., can solve the problems of unusable and high cost, and achieve the effect of improving density, improving magnetic flux pinning force, and strengthening grain connection
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[0015] Example 1
[0016] The dried magnesium (99%), boron (99%), and nano-C powder were thoroughly mixed in the ratio of atomic ratio Mg:B:C=1:3.9:0.1 for 1 hour. The mixed powder is pressed into a sheet with a diameter of Φ20mm with a hydraulic press, and the pressure is 30MPa, and then placed in a vacuum annealing furnace, evacuated at room temperature, until the vacuum degree reaches 10 -3 After Pa was filled with pure argon gas, the flakes or blocks were heated at a heating rate of 60°C / min, kept at a temperature of 900°C for 2 hours, and finally the flakes were cooled to room temperature at a cooling rate of 25°C / min. Then the flakes are crushed into micron-sized powder, and an appropriate amount of metal magnesium powder is added to it to obtain a mixed powder with an atomic ratio of magnesium and (boron + C) of 1:2. The mixed powder is pressed into a sheet with a diameter of Φ20mm with a hydraulic press, and the pressure is 30MPa, and then it is placed in a vacuum annealin...
Example Embodiment
[0017] Example 2
[0018] The dried magnesium (99%), boron (99%), and nano-C powder were thoroughly mixed in the ratio of atomic ratio Mg:B:C=1:3.9:0.1 for 1 hour. The mixed powder is pressed into a sheet with a diameter of Φ20mm with a hydraulic press, and the pressure is 30MPa, and then placed in a vacuum annealing furnace, evacuated at room temperature, until the vacuum degree reaches 10 -3 After Pa was filled with pure argon gas, the flakes or blocks were heated at a heating rate of 60°C / min, kept at a temperature of 900°C for 2 hours, and finally the flakes were cooled to room temperature at a cooling rate of 25°C / min. Then the flakes are crushed into micron-sized powder, and an appropriate amount of metal magnesium powder is added to it to obtain a mixed powder with an atomic ratio of magnesium and (boron + C) of 1:2. The mixed powder is pressed into a sheet with a diameter of Φ20mm with a hydraulic press, and the pressure is 30MPa, and then it is placed in a vacuum annealin...
Example Embodiment
[0019] Example 3
[0020] The dried magnesium (99%), boron (99%), and nano-C powder were thoroughly mixed in the ratio of atomic ratio Mg:B:C=1:3.9:0.1 for 1 hour. The mixed powder is pressed into a sheet with a diameter of Φ20mm with a hydraulic press, and the pressure is 30MPa, and then placed in a vacuum annealing furnace, evacuated at room temperature, until the vacuum degree reaches 10 -3 After Pa was filled with pure argon gas, the flakes or blocks were heated at a heating rate of 60°C / min, kept at a temperature of 900°C for 2 hours, and finally the flakes were cooled to room temperature at a cooling rate of 25°C / min. Then the flakes are crushed into micron-sized powder, and an appropriate amount of metal magnesium powder is added to it to obtain a mixed powder with an atomic ratio of magnesium and (boron + C) of 1:2. The mixed powder is pressed into a sheet with a diameter of Φ20mm with a hydraulic press, and the pressure is 30MPa, and then it is placed in a vacuum annealin...
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