Instantaneous nanowelding of ultra‐high temperature ceramics for hypersonics

Abstract Ultra‐high temperature ceramics (UHTCs) are a group of advanced ceramic materials that possess excellent high capabilities, which make them especially suitable for extreme environment engineering applications. As an effective assembling method, joining is frequently required fabricating sophisticated structures such applications due to the excessive challenges and costs in producing near‐net shapes. Here, we introduce promising new technique effectively join UHTCs called Instantaneous Nanowelding , uses direct electric current assisted rapid Joule heating instantaneously bond hafnium diboride (HfB 2 ) zirconium (ZrB 1 s down atomic scale. Our approach analogous spot welding, entire process complete 10 min, instant diffusion occurs s. Seamless HfB /ZrB interfaces formed at 1750 duration A series characterizations done using techniques including SEM, WDS, EBSD, S/TEM observe Zr x Hf 1− B solid solution formation. Highly coherent transition with perfect lattice alignment scale from ZrB observed S/TEM, meaning two brought contact.