Cold spray is an emerging coating preparation technology with advantages of high deposition efficiency,low porosity and high bonding strength,which has broad application potential in aerospace,automobile,energy,ocean,petrole-um and chemical industries.The research focus of cold spray has transformed from theoretical research to industrial applica-tion over the past 30 years.Therefore,development history of bonding mechanisms and material systems of cold spray was reviewed in this paper,followed a brief introduction on the principle of cold spray.Furthermore,development trends of cold spray in terms of high performance,low cost and additive manufacturing were summarized,involving improvements of spray systems,powders,working gases and off-line path optimization.Finally,challenges and prospects of cold spray were pro-posed.
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