Microstructure and properties of Fe-based amorphous coating by HVOF

The amorphous Fe-based coating was fabricated on 304 stainless steel matrix by high velocity oxygen fuel (HVOF). The microstructure, friction properties and wear mechanism of the coating were analyzed by scanning electron microscopy, X-ray diffractometer, Vickers microhardness tester, friction and wear tester, three-dimensional optical profilometer and other equipment. Results show that: most of the coatings were amorphous, and the amorphous content increased first and then decreased with the increase of heat input. When the spraying parameters are kerosene flow rate 5.5gpH, oxygen flow rate 2000SCFH, powder feeding rate 4RPM, spraying distance 360mm, the coating amorphous content is over 80%, the hardness is over 800HV0.2, the wear resistance advances over 2.5 times than the matrix.