Calculation of the transport critical current density of c-axis textured 122 iron-based superconductors

► We modeled the current paths in a c-axis textured pnictide as a flow network. ► 2 × 105 A/cm2 could be achieved in a c-axis textured K-doped 122 polycrystal. ► The dependences of Jc on density and invalid boundary were studied. ► Flaky grain could be benefit for high transport Jc.