Joint　homogenization　during　transition　metal　carbides　ceramic　bonding　has　attracted　much　attention　as　a　technique　to　increase　the　service　temperature　and　relieve　the　residual　stress　for　various　high-temperature　applications.　In　this　work,　homogeneous　joints　of　ZrC0.85　ceramic　were　obtained　by　diffusion　bonding　using　single　Nb　and　multiple　Ti/Nb/Ti　as　the　interlayer.　The　effect　of　interlayer　composition,　bonding　temperature　and　holding　time　on　the　microstructure　of　the　joints　was　investigated.　The　effect　of　Nb　and　Ti　on　the　composition　homogeneity　and　the　formation　of　Kirkendall　voids　in　the　ZrC0.85　joints　was　also　discussed.　When　using　single　Nb　as　the　interlayer,　the　homogenization　of　the　joints　can　be　achieved　at　a　bonding　temperature　of　∼1500　°C　and　holding　for　1　h　and　no　Kirkendall　voids　were　observed　when　further　increasing　the　bonding　temperature　to　1600　°C　because　of　the　good　mutual　solubility　of　NbCx　and　ZrCx　and　the　relative　moderate　diffusion　rate　of　Nb.　However,　severe　Kirkendall　effects　were　observed　at　a　higher　temperature　of　1700　°C,　which　would　deteriorate　the　high-temperature　performance　of　the　joints.　The　adoption　of　Ti/Nb/Ti　further　minished　the　diffusion　rate　difference　of　the　interfacial　elements　through　the　formation　of　TiCx　phase.　As　a　result,　only　a　few　Kirkendall　voids　were　formed　at　1700　°C.　Nano-hardness　of　the　resultant　homogeneous　joints　was　comparable　to　that　of　the　ZrC0.85　ceramic　due　to　their　similar　composition.　This　study　shows　that　active　diffusion　bonding　based　on　interlayer　design　for　homogeneous　joints　could　pave　a　new　way　to　join　transition　metal　carbides.　©　2024　The　Authors