Sintering behavior of ZrB2 ceramic with nano-sized SiC dopant was studied.ZrB2-25 vol％ nano-sized SiC was selected as the starting mixture to fabricate the composite.The manufacturing process was accomplished at 1800℃ for 5 min under 25 MPa via spark plasma sintering (SPS).The as-sintered sample reached a relative density of 99％.Besides the initial phases,namely ZrB2 and SiC,the high-resolution X-ray diffraction (HRXRD) was used to study the formation of an in-situ ZrC phase.The possible chemical interactions during the ZrC phase formation were scrutinized.The microstructure of the composite was studied by the field emission scanning electron mi-croscopy (FESEM) and transmission electron microscopy (TEM).Elemental analysis through FESEM evaluations revealed the formation of amorphous phases,rich in Zr,C,Si,B,and O elements,which was in harmony with the thermodynamical assessments.TEM studies endorsed the formation of such phases,containing a glassy bed of Si-B-O with ZrC and C islands dispersed therein.