In this paper,the microstructure of nodulation produced in Laval nozzle of HVOF as spraying NiCr-Cr3C2 coating was analyzed,and the reason of nodulation formation was discussed.

• 围绕超音速火焰喷涂NiCr-Cr3C2涂层时在Laval管内壁产生结瘤的问题,在分析结瘤产物显微结构的基础上探讨了形成结瘤的原因。