Abstract:The existing research on the cold sprayed ceramic coatings indicates that the most commercial ceramic powders cannot be successfully sprayed. Whereas agglomerated nanometer powders prepared in the laboratory can achieve cold sprayed ceramic coating. Sol-gel method is one of the most common used methods to prepare nanosized TiO2. It has the advantages of a simple process, low equipment requirement and simple control of the reactions, etc. In order to obtain the nanoparticles of different structure and morphology, the reactions can be controlled at the molecular level through the change of the experimental parameters. In this paper, nanoanatase TiO2 was prepared by the hydrolysis reaction of tetrabutyl titanate, and its cold spraying performance was investigated. Moreover, the influence of the powder properties on its cold spray performance was analyzed. The results show that TiO2 powders prepared by sol-gel method can be deposited as coatings easier than commercial TiO2 powders by cold spray technology. Sol-gel TiO2 powders exhibit irregular morphology, and transferred to anatase phase after thermal treatment. The crystal phase and micro-morphology of cold sprayed TiO2 coating are the same with sol-gel TiO2 powders. The photocatalytic performance of cold sprayed TiO2 coating is affected by feed powders. The photocatalytic performance of the cold sprayed TiO2 coating has been improved with the increased photocatalytic activity of sol-gel TiO2 powders.