Abstract
FeNiCrMoV and WC-NiCr coatings were deposited using the high velocity oxygen fuel (HVOF) spray process under different spray parameters with powders of different size to clarify the influence of the melting state of spray particles on the adhesive strength of the coating. The adhesive strength of the coating was estimated according to the Pin test method. The melting state of the spray droplet was examined from the coating microstructure. It was found that melting state of spray particles had a significant effect on the adhesive strength of HVOF sprayed Fe-based coatings. It can be suggested that good melting of the spray particle is mainly related to the mechanical interlocking effect, which reaches the limited and approximately defined adhesive strength up to 20-30 MPa.
