ABSTRACT： The article is about evolution of the research processes on cold spraying technology. It is pointed out that a new research direction on cold spray. Compared with the thermal spraying， cold spraying has the obvious superiority， which has been developed in these years. The metal coating deposition could be obtained by cold spraying technology under the low temperature condition. There is nearly no heat effect that cold spraying process to the structure of the powder particles， but is quite helpful for the particles’ acceleration without considering the oxidation in the process of metal material deposition. In this paper，the principle and features of cold gas spraying technology have been introduced. The up - to -date research progress about bonding mechanism， technological parameter and heat treatment have been summarized. The mechanical bond， which is the fundamental mode of the combination of the coating and basal body as well as the combination of particles in the coating， leads to the result that the bond strength between coating and the basal body is not high. How to deal with the coating by heat treatment and improve the bond strength becomes a new research direction of the cold gas spraying technology.
KEY WORDS： cold spray； bonding mechanism； velocity of particles； heat treatment
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