Abstract: The microstructure, mechanical and tribological properties of cold sprayed CoNiCrAlY coatings at elevated temperatures were studied. CoNiCrAlY coatings were prepared by high-pressure cold spraying technique via helium gas and subsequently heat treated at 1080 ℃for 4 h in a vacuum environment.The microstructures and porosity levels of the coatings before and after vacuum heat treatment were characterized by optical microscopy (OM) and scanning electron microscopy(SEM).The high temperature hardness and tribological properties of the heat-treated coatings were analyzed.The results show that the CoNiCrAlY coatings are very dense and the porosity level is around 0.3%.The coating/substrate interfacial bonding is very intimate and the coating microhardness is around 600 HV0.3. Post-process heat treatment can effectively reduce the porosity and microhardness of the coatings.The microhardness of CoNiCrAlY coatings gradually decreases with the increase of testing temperatures (800 ℃, 900 ℃, 1000 ℃).Besides, the friction coefficients and wear rates of CoNiCrAlY coatings also decrease with the increase of testing temperatures. It can be seen that CoNiCrAlY coatings have excellent high temperature wear resistance.