HVAF—Chance and Challenge for Users and for Powder Producers

This paper discusses the differences between high-velocity air fuel (HVAF) and classical kerosene-fired high-velocity oxygen fuel (KF-HVOF) spray processes and explains how they impact coating metallurgy and properties such as hardness, Young’s modulus, and wear resistance. The biggest differences are observed in cavitation erosion tests where HVAF coatings have a 50% greater impact on wear reduction. Potential advantages in the use of HVAF spraying for depositing thin, corrosion resistant WC-CoCr layers are also discussed.