Abstract
High strength (HfTaZrNbTi)C high-entropy carbide (HEC) ceramic and metal Nb joint was successfully obtained through active brazing with Ti61Ni (at.%) composite interlayer. The key to realizing joining was the generation of (Ti, Nb)C reaction layer, which resulted from the active Ti reacting with the ceramic. And the lattice distortion and sluggish diffusion effects of high-entropy ceramic on the interfacial reaction behavior were revealed. The (Ti, Nb)C reaction layer thickness decreased with the increased brazing temperature from 1180 to 1240 °C, while as the holding time prolonged from 5 to 30 min, no significant change appeared in the thickness of the (Ti, Nb)C reaction layer. This phenomenon was remarkably different from the other non-high entropy carbide ceramics. The highest shear strength of the (HfTaZrNbTi)C/Nb joint was 184 MPa which brazed at 1200 °C for 10 min and fracture primarily occurred between the (Ti, Nb)C and (Ti, Nb)2Ni layers and then crossed the ceramic.
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