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电泳法制备YBCO超导厚膜的研究屡见报道,然而其临界电流密度较低。通过引入不同比例的Y_2BaCuO_5(Y211)粒子作为磁通钉扎中心,将顶部籽晶技术和熔融织构工艺相结合,并且采用高压氧处理调节氧含量的均匀性,制备出织构的YBCO超导厚膜,有效改善了晶界弱连接,提高了临界电流密度。实验证明,在YBa_2Cu_3O_(7-δ)(Y123)电泳粉末中掺入40 mol％Y211,制备出YBCO超导厚膜的临界电流密度达到7.008×10~3A/cm~2(77K),高于当前报道用电泳法制备的厚膜最高临界电流密度。
The research of YBCO superconducting thick film by electrophoresis has been reported frequently, however, its critical current density is low. YBCO superconductors (YBCO) were fabricated by introducing Y2BaCuO_5 (Y211) particles with different proportions as magnetic flux pinning centers, combining the top seed crystal technology with the melt texturing process and adjusting the oxygen content uniformity by hyperbaric oxygen treatment. Thick film, effectively improve the weak connection of the grain boundary, raising the critical current density. The experimental results show that the critical current density of YBCO superconducting thick film is 7.008 × 10 ~ 3A / cm ~ 2 (77K) when doped with 40 mol% Y211 in YBa2Cu_3O_ (7-δ) (Y123) Currently reported by electrophoresis prepared thick film maximum critical current density.