Progress of Cold Sprayed Ti and Ti Alloy Coatings
The low temperature characteristic of the cold spray process determines its suitability for the preparation of oxidationsensitive Ti and Ti alloy coatings. Due to the poor deformability of Ti metal, it is difficult to obtain high quality cold spray coatings. At present, domestic and foreign scholars have carried out lots of research work on cold sprayed Ti and Ti alloy coatings. Based on a large number of literatures, this paper classified and summarized the microstructure control methods of cold spray Tibased coatings. The control methods of cold spray titanium coatings mainly focus on four aspects of spraying parameters: Powder state, substrate state, powder condition and nozzle. Some emerging techniques such as in situ shot peening and warm spraying have also proved to be an effective auxiliary for enhancing particle deformation. In the future, the research on cold sprayed Ti and Ti alloy coatings should focus on the cold spraying process itself and integration with other processing technologies.