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This study aims to determine the influence of HVOF (High Velocity Oxygen Fuel) spray parameters including powder feed rate (M), spray distance (L), and gun traverse speed (V) on the porosity and adhesion strength of CoNiCrAlY coatings on C45 steel substrates. In addition, optimal parameters were also identified to improve the porosity and adhesion strength of the coating based on Taguchi method and ANOVA analysis. Microstructure of CoNiCrAlY coatings were also considered because of the difference between spray and substrate materials. Results show that a good bonding between sprayed particles was found through the formation of β-(Co,Ni)Al and γ-Co,(Ni,Cr) phases. Besides, M1L2V2 and M2L2V3 were proposed optimal parameter sets and verified to achieve the lowest coating porosity of 1.56% and highest adhesion strength of 64.6 Mpa, respectively. From there, it can be seen that the HVOF provides an effective solution for metal surfaces because of creating surface layers with different required working characteristics which may differ in properties from the substrate surface.

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A Study on Microstructure and Optimization of Spraying Parameters for Porosity and Adhesion Strength of CoNiCrAlY Coating

  • 会议论文

  • 发表日期：

    2025年

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  • Thanh-Phu Nguyen,
  • Thi-Thao Ngo,
  • Khac-Khanh Bui,
  • Thanh-Hoa Doan

摘要

This study aims to determine the influence of HVOF (High Velocity Oxygen Fuel) spray parameters including powder feed rate (M), spray distance (L), and gun traverse speed (V) on the porosity and adhesion strength of CoNiCrAlY coatings on C45 steel substrates. In addition, optimal parameters were also identified to improve the porosity and adhesion strength of the coating based on Taguchi method and ANOVA analysis. Microstructure of CoNiCrAlY coatings were also considered because of the difference between spray and substrate materials. Results show that a good bonding between sprayed particles was found through the formation of β-(Co,Ni)Al and γ-Co,(Ni,Cr) phases. Besides, M1L2V2 and M2L2V3 were proposed optimal parameter sets and verified to achieve the lowest coating porosity of 1.56% and highest adhesion strength of 64.6 Mpa, respectively. From there, it can be seen that the HVOF provides an effective solution for metal surfaces because of creating surface layers with different required working characteristics which may differ in properties from the substrate surface.