Effect of particle state on the adhesive strength of HVOF sprayed metallic coating

摘要: NiCrBSi and Ni-50Cr coatings were deposited using the high velocity oxygen fuel (HVOF) spray process under different parameters with two powders of sizes to clarify influence melting state particles on adhesive strength coating. The coating was estimated according American Society for Testing Materials (ASTM) C633-79. droplet examined from microstructure. It found that had a significant effect HVOF sprayed Ni-based coatings. particle did not contribute increase in adhesion metallic On other hand, deposition partially melted large contributed substantial improvement subsequent presented dense microstructure yielded an more than 76 MPa, which double completely molten particles. can be suggested good is mainly related mechanical interlocking effect, reaches limited approximately defined up 40–50 MPa.