Cu doped MgB2 superconductor and low-temperature rapid preparation method

Abstract

The invention provides a copper-doping MgB2 superconductor and a method for preparing at low temperature. The components and the molecular mass ratio are as follows: (Mg1.1B2)1-xCux, x equals to 0.01-0.10. The preparation method is that: sufficiently mix magnesium powder, copper powder and boron powder according to a ratio in an agate mortar, then make a sheet under a pressure of 2-10 MPa, finally send the sheet into a high temperature difference indication scan calorimetric instrument or a tubular type sintering furnace to carry out low-temperature sintering, the heating rate is 10-40 DEG C / min, keep the temperature and carry out sintering for 2-7 hours when the temperature reaches 490-600 DEG C, then cool the temperature to room temperature at the rate of 10-40 DEG C / min. The analysis indicates that the sintering temperature for preparing the MgB2 superconductor is low and the sintering time is short, thus considerably remedy the defect of long sintering time of a traditional low-temperature sintering method for preparing the MgB2 superconductor, furthermore, the MgB2 superconductor prepared by the method has excellent superconductive performance. Therefore, the copper-doping sintering method is a very potential and practical production method.

Description

technical field [0001] The invention belongs to the field of superconducting technology, and in particular proposes a Cu-doped MgB 2 Superconductor and low-temperature rapid preparation method. Background technique [0002] Since H.K. Onnes of Leiden University in the Netherlands discovered the superconductivity of mercury in 1911, people have been unremittingly exploring and researching this wonderful phenomenon. The unique zero resistance and diamagnetism of superconducting materials make them have broad application prospects in the fields of electric energy, superconducting magnets, biology, medical technology, communications and microelectronics. Nowadays, the research on superconductivity is becoming more and more popular all over the world. The United States, Japan and the European Union have listed superconducting technology as the key to maintaining cutting-edge advantages in the new century. [0003] Superconducting materials can be divided into two categories acc...

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Problems solved by technology

However, during the sintering process, the diffusion rate of atoms in the solid phase is slower than that in the liquid phase, so the reported MgB 2 The low-temperature solid-phase sintering process generally takes 16 to 60 hours, and the sintering time is relatively long. At the same time, it is also noted that mechanical ball milling is required to pretreat the sintered powder or select raw materials in the nanometer size range, which undoubtedly increases the cost of the preparation process. thus also limiting the MgB 2 The promotion of superconductors in industrial production, so looking for a low-temperature rapid sintering preparation of MgB 2 The approach to superconductors has important practical implications

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