Effect of Kerosene Flowing Rate on Microstructure and Wearing Properties for Fe-based Amorphous Coatings

The effects of kerosene flow rate on the microstructure and wearing properties were investigated for Fe-based amorphous coatings sprayed by High Velocity Oxygen Fuel (HVOF). The microstructures and wearing properties of the Fe-based amorphous coatings were analyzed with scanning electron microscope (SEM), X-ray diffraction analyzer (XRD), and ball-on-disc tribometer (CFT-1), respectively. The experimental results show that the well interfacial bonding can be observed between the amorphous coating layer and the substrate, and the porosity in amorphous coating layer is less to 1%. Only some crystalline α-Fe and FeO phases can be detected by XRD in the amorphous coatings, while the amorphous content is up to 99.4%. The wearing coefficient is near to 0.15, which is superior to SUS316 of 0.28. As the increasing of wearing loads, the failure mode is changed from oxidation wear to the composite of oxidation and abrasive wear.