Study on the Fe-Based Amorphous Coatings by HVOF Based Processes

Processing of amorphous coatings by thermal spray in air is a task to maintain the amorphous structure and to satisfy the corrosion and wear performance.  Both the commercially available and newly developed Fe based amorphous powders are analyzed and sprayed by both conventional and modified high velocity oxygen fuel (HVOF) spray processes.  Assessment of amorphous content and microstructure for the powders and the coatings is conducted to analyze the shrouding effects of flight particles and the nitrogen cooling in Warm spray.  Wear and corrosion tests are also conducted to assess the amorphous and microstructural effects as well as HVOF based spray process comparison