The　microstructures,　mechanical　properties　and　tribological　behaviors　of　the　NiAl-based　composite　coatings　with　various　addition　of　Nb　were　investigated.　Particularly,　the　coatings　registered　a　typically　fine　lamellar　morphology　and　a　dense　microstructure,　of　which　the　microhardness　increased　with　the　Nb　content　increasing.　Moreover,　the　coatings　with　various　Nb　contents　registered　different　tribological　properties　and　wear　mechanisms　at　different　test　temperatures.　The　wear　mechanisms　of　the　coatings　transferred　from　serious　abrasive　wear　(NA1),　brittle　fracture　accompanied　with　abrasive　wear　(NA2),　abrasive　wear　(NA3)　to　serious　fracture　and　abrasive　wear　(NA4)　with　the　increment　of　Nb　content　at　room　temperature.　At　400　°C,　the　coatings　with　low　contents　of　Nb　(NA1,　NA2)　possessed　low　friction　coefficients　but　high　wear　rates　due　to　the　plastic　deformation　and　micro-cutting.　However,　the　coatings　with　high　contents　of　Nb　(NA3,　NA4)　possessed　higher　friction　coefficients　but　low　wear　rates　due　to　the　reinforcement　and　anti-wear　effect　of　metal　Nb,　and　the　wear　mechanism　was　dominated　by　adhesive　wear.　At　800　°C,　the　coatings　possessed　the　wear　mechanism　of　slight　abrasive　wear,　and　a　series　of　bimetallic　oxides,　e.g.　AgNbO3　and　NiNb2O6　generated　through　the　high-temperature　tribochemical　reactions.　The　synergistic　lubrication　of　oxides　was　responsible　for　the　lower　COFs　of　the　coatings　at　800　°C.　But　higher　wear　rate　of　the　NA1　coating　was　ascribed　to　the　low　hardness　and　adhesive　strength　due　to　the　low　content　of　metal　Nb.　As　a　whole,　metal　Nb　could　observably　enhance　the　wear　resistance　of　the　coatings　at　different　temperatures.　©　2022　Elsevier　B.V.