Fabrication of multifilamentary powder in tube superconducting tapes of Bi 2223
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Author : LZH
Update time : 2023-07-25 02:32:01
What is Bisthmuth? Based on these studies, only a few dopants can improve the superconducting properties of Bi-2223, such as Eu, Cr, and MgO. But most dopants negatively impact the phase content and current capacity of Bi-2223. Therefore, considering the complex chemical composition of the Bi-2223 system, it is not quite reasonable to add more elements to the matrix to increase its complexity. The tuning of metallic cations stoichiometry, including Bi, Sr, Ca, Cu, and Pb, has been considered an applicable way to optimize both the phase formation mechanism during sintering and the superconducting properties of final tapes. P. Majewski has done considerable work on the phase diagram of the Bi-Pb-Sr-Ca-Cu-O system. He has reported the Bi-2223 phase diagram with the variable of Sr: Ca ratios, Pb contents, and even Ag contents, and Bi2O3-SrO-CaO-CuO tetrahedrons under different sintering temperatures have also been obtained. Therefore, it was suggested that the Sr: Ca ratio is an important parameter to influence the phase evolution process of the Bi-2223 system. Osamura et al. Reported that the decrease of the Sr: Ca ratio could lead to the decrease of Bi-2223 formation temperature, which was beneficial to the decrease of secondary phase content. But most of the previous studies were done in the bulks system. Considering the different phase evolution behavior between tapes and bulks, our study discussed the effects of different Sr content on the practical multifilament Bi-2223 tapes. n this study, 37-filament Bi-2223 tapes were fabricated with the precursor powders fabricated by co-precipitation process containing different Sr contents of × varied from 1.93 to 1.90 and 1.85 as in Bi1.76Pb0.34SrxCa2.02Cu3.06O10+δ. The contents of all the other cations kept constant. The influences of Sr content on the phase evolution dynamics, phase composition, microstructures, and the magnetic field dependence of current capacity in Ag-sheathed Bi-2223 tapes after a full heat treatment process were systematically studied. The maximum current capacity has been obtained with further optimization of sintering parameters.
Heat treatment on phase evolution of Bi-2223 precursor powder prepared by spray pyrolysis method The phase evolution of Bi-2223 precursor powder prepared by spray pyrolysis is studied with different heat treatment parameters. The results show that precursor powder's reaction temperature and phase composition depend on the heat treatment atmosphere. Phase assemblage of (Bi, Pb)-2212, AEC, CuO, and small Bi-2201 can be obtained by heat-treated in N2-0.1%O2 atmosphere. For precursor powder, there is a sufficient reaction process at 770 °C, and the dimension of the Bi-2212 phase increases rapidly with the increase of heat treatment temperature and time. The dimension of the AEC phase also increases by extending the heat treatment time. As a balance among phase assemblage, dimension of a particle, and adequate reaction, a reasonable precursor powder can be obtained by heat-treated at 770 °C for 12 h–16 h in an N2-0.1%O2 atmosphere. The critical current of 37-filament Bi-2223 tape is about 120 A, which confirms that these heat treatment parameters are reasonable.
Fabrication of multifilamentary powder in tube superconducting tapes of Bi-2223 Bi2SrxCa2Cu3O10+δ (Bi-2223) precursor powders were fabricated by co-precipitation with different Sr content of x = 1.93, 1.90, and 1.85. Multi-filamentary Bi-2223 high-temperature superconducting tapes were fabricated by the traditional powder-in-tube process (PIT) with different precursor powders. The influences of Sr content on the phase formation dynamics and the superconducting properties of Bi-2223 tapes have been systematically investigated. With decreasing Sr content, the critical temperature of Bi-2223 tapes decreased from 109.9 K to 107.7 K, which implied that the change of Sr content could change the carrier concentration on the Cu-O plane, thus leading to the variation of intrinsic superconducting transition behavior. Besides, the phase formation temperature decreased with the decrease in Sr content. Bi-2223 tapes with higher superconducting phase content were obtained with the Sr content of 1.85, which was beneficial to improving intergrain connections. Thus, the Jc-B behavior was enhanced under the magnetic field parallel to the ab plane of Bi-2223. With further optimization of the sintering process, the maximum Ic of 128 A was achieved on Sr = 1.85 tapes, corresponding to the critical current density, Jc of ~ 25.8 kAcm−2. The high-temperature superconductivity in Bi-based superconductors, with a critical temperature of 20 ~ 110 K, was first reported in 1987. Since then, Bi2Sr2Ca2Cu3O10 + δ (Bi-2223) [1], which exhibits the highest Tc among Bi-based compounds and large current capacity, has been recognized as the most promising high-temperature superconductor for practical applications. So far, multifilamentary Bi-2223 tapes, also called the first generation (1G) HTS material, fabricated by powder-in-tube (PIT) process with large current capacity, high uniformity, good mechanical properties and a length of over 1000 m can be produced as commercial products in Sumitomo Electric Industries (SEI) and American Superconductor Corporation (AMSC). Moreover, Bi-2223 HTS tapes have been successfully adopted in many demonstration projects, such as in HTS cables, HTS motors, and current lead for big facilities like ITER. Thus the stability of this compound has already been confirmed.
Price of Bisthmuth Bisthmuth particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Bisthmuth. A large amount of large amount will be lower. The Price of Bisthmuth is on our company's official website.
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