Abstract
NiCrBSi and Ni-50Cr coatings were deposited using the high velocity oxygen fuel (HVOF) spray process under different spray parameters with two powders of different sizes 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 American Society for Testing and Materials (ASTM) C633-79. The melting state of the spray droplet was examined from the coating microstructure. It was found that the melting state of spray particles had a significant effect on the adhesive strength of HVOF sprayed Ni-based coatings. The significant melting of the spray particle did not contribute to the increase in the adhesion of HVOF metallic coatings. On the other hand, the deposition of a partially melted large particle contributed to the substantial improvement of adhesive strength of the HVOF coating. The subsequent coating presented a dense microstructure and yielded an adhesive strength of more than 76 MPa, which was double that of the coating deposited with completely molten particles. It can be suggested that the 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 40–50 MPa.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
D.C. Crawmer, J.D. Krebsbach, and W.L. Riggs: “Coating Development for HVOF Process Using Design of Experiment” in Thermal Spray: International Advances in Coatings Technology, C.C. Berndt, ed., ASM International, Materials Park, OH, 1992, pp. 127–36.
C.-J. Li, K. Sonoya, G.-C. Ji, and Y.-Y. Wang: “Effect of Spray Conditions on the Properties of HVOF Cr3C2-NiCr Coatings,” Weld World, 1988, 41(2), pp. 77–87.
H. Kreye, D. Fandrich, H.-H. Muller, and G. Reiners: “Microstructure and Bond Strength of WC-Co Coatings Deposited by Hypersonic Flame Spraying (Jet Kote Process)” in Proceedings of 11th International Thermal Spray Conference, Canada Welding Research Institute, 1986, pp. 121–28.
R. Kawase: “Evaluation Methods for Thermal Spray Coatings” in Thermal Spray: Research, Design and Applications, C.C. Berndt and T.F. Berbecki, ed., ASM International Materials Park, OH, 1993, pp. 575–79.
Y. Inoue, A. Noutomi, M. Toyoda, and A. Izuha: “Applicability of Stress Singularity Parameter for Evaluating Bond Strength of Plasma Sprayed Coatings” in Thermal Spray Coatings, Properties, Processes and Applications, T.F. Bernecki, ed., ASM International, Materials Park, OH, 1992, pp. 251–55.
E. Lugscheider and P. Jokiel: “Characterization of Particle Reinforced Nickel Hard Alloys Produced by Thermal Spraying” in Thermal Spray: Research, Design and Applications, C.C. Berndt and T.F. Berbecki, ed., ASM International Materials Park, OH, 1993, pp. 411–16.
C.-J. Li and H. Li: “Study of Properties of HVOF Ni-Based Self-Fluxing Alloy Coatings Through the Orthogonal Regression Experimental Design Method” in Proceedings of 8th China National Meeting on Welding, Vol. 1, Welding Society of China, Mechanical Industry Publishing House, Beijing, 1997, pp. 420–24 (in Chinese).
C.-J. Li and H. Li: “Effect of Microstructure on the Properties of HVOF Sprayed Nickel-Based Self-Fluxing Alloy Coatings” in Proceedings of the International Conference on Surface Engineering, B.S. Xu, ed., China Machine Press, Beijing, 1997, pp. 69–71.
R. McCaw and R. Hays: “Application of Commercially Pure Titanium Coatings Using the High Velocity Oxy-Fuel Thermal Spray Process Under Atmospheric Condition” in Thermal Spray: International Advances in Coatings Technology, C.C. Berndt, ed., ASM International, Materials Park, OH, 1992, pp. 881–86.
C.-J. Li and H. Li: “Effect of WC-Co Addition on the Adhesion of HVOF Ni-Based Coatings” in Thermal Spray: Meeting the Challenges of the 21st Century, C. Coddet, ed., ASM International, Materials Park, OH, 1988, pp. 723–28.
K. Kreye, R. Schwetzke, and S. Zimmermann: “High Velocity Oxy-Fuel Flame Spraying-Process and Coating Characteristics” in Thermal Spray: Practical Solutions for Engineering Problems, C.C. Berndt, ed., ASM International, Materials Park, OH, 1996, pp. 451–56.
C.-J. Li, A. Ohmori, and Y. Harada: “Effect of WC Particle Size on the Formation of HVOF Sprayed WC-Co Coating” in Thermal Spray: Current Status and Future Trend, A. Ohmori, ed., High Temperature Society of Japan, Osaka University, Japan, 1995, pp. 869–75.
T. Wu, C.X. Li, and C.-J. Li: “Simultaneous Measurement of Particle Velocity and Temperature by Thermal Emission,” Mater. Protect., 1999, 32(10-B), pp. 124–27.
S. Kuroda, Y. Tashiro, H. Yumoto, S. Taira, and H. Fukanuma: “Peening Action and Residual Stresses in HVOF Thermal Spraying of 316L Stainless Steel” in Thermal Spray: Meeting the Challenges of the 21st Century, C. Coddet, ed., ASM International, Materials Park, OH, 1988, pp. 569–74.
C.-J. Li and J.-L. Li: “Transient Droplet/Substrate Contact Pressure During Flattening on Flat Substrate in Plasma Spray” in Thermal Spray Surface Engineering via Applied Research, C.C. Berndt, ed., ASM International, Materials Park, OH, 2000, pp. 777–82.
C.-J. Li, A.-J. Fu, and H. Fukanuma: “Effect of Surface Topography on the Morphology of Plasma Sprayed Splat,” J. Therm. Spray Technol., unpublished research.
Y.-Y. Wang, F.-X. Ye, C.-J. Li R.-X Ma, and W.-C Be: “Microstructure and Adhesion of HVOF Sprayed NiCrAlY Coatings” in Proceedings of 9th China National Welding Conference, Helongjing Peoples Press, Haerbing, China, 1999, pp. 1–299 (in Chinese).
L. Pawlowski: The Science and Engineering of Thermal Spray Coating. John Wiley & Sons, New York, 1995, pp. 235–38.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Li, CJ., Wang, YY. Effect of particle state on the adhesive strength of HVOF sprayed metallic coating. J Therm Spray Tech 11, 523–529 (2002). https://doi.org/10.1361/105996302770348655
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1361/105996302770348655