Investigating the impact of high velocity oxy-fuel spraying technology parameters on the hardness of carbides material coating for internal surface of pipes
The hardness of high-speed oxyfuel thermal spray coatings is a major factor determining coating properties, especially when applying thick coatings for repair purposes. This study aims to optimize and determine the influence of HVOF (High velocity oxy-fuel) spraying parameters on the hardness of WC-12Co coatings applied to the internal surface of 20Cr steel pipes. The parameters investigated are spray distance (L), powder feed rate (P), and relative velocity of spray gun (V). The experimental parameters were determined by using a Taguchi L9 orthogonal design. The results showed that the optimal spraying parameters were L2 = 0.25 m, P1 = 20 g/min, and V3 = 0.2 m/s, resulting in a maximum coating hardness of 1308.6 HV. The effect of spraying parameters on hardness was observed to follow the order P (48.5%) > L (33.7%) > V (17.0%). An experimental function was developed to establish the relationships between hardness and spraying parameters, enabling the evaluation of the influence of the researched spraying parameters on hardness.
Tài liệu tham khảo
A.S. Taha, F.H. Hammad, Application of the Hall‐Petch Relation to Microhardness Measurements on Al, Cu, Al‐MD 105, and Al‐Cu Alloys, Phys. Status Solidi. 119 (2015) 455–462. doi.org/10.1002/pssa.2211190207.
ASTM E384 - 17: 2011 Standard Test Method for Microindentation Hardness of Materials, ASTM International, West Conshohocken, www.astm.org
Ilavsky J, Písacka J, Chraska P, Margandant N. Siegmann S, Wagner W. Barbezat G et al (2000) Microstructure-wear and-corrosion relationships for thermally sprayed metallic deposits. In: ITSC 2009. ASM International, pp 449-454
Karimi A, Verdon C, Barbezat G (2015) Microstructure and hydroabrasive wear behaviour of high velocity oxy-fuel thermally sprayed WC-Co (Cr) coatings. Surf Coat Technol pp:81-89
M.E. Vinayo, F. Kassabji, J. Guyonnet, P. Fauchais, Plasma sprayed WC–Co coatings: Influence of spray c on the crystal structure, porosity, and hardness, J. Vac. Sci. Technol. A Vacuum, Surfaces, Film. 3 (2016) 2483–2489. doi.org/10.1116/1.572863.
Matthews, S.; James, B. Review of Thermal Spray Coating Applications in the Steel Industry: Part 1—Hardware in Steel Making to the Continuous Annealing Process. J. Therm. Spray Technol. 2012, 19, 1267–1276
Padture, N.P.; Gell, M.; Jordan, E.H. Thermal Barrier Coatings for Gas-Turbine Engine Applications. Science 2010, 296, 280–284
Pawlowski L (2008) The science and engineering of thermal spray coatings. Wiley
Schwetzke R, Kreye H (2014) Microstructure and properties of tungsten carbide coatings sprayed with various high-velocity oxygen fuel spray systems. J Therm Spray Technol 8(3):pp433-439
Taguchi G, Konishi S (1987) Taguchi Methods, orthogonal arrays and linear graphs, tools for quality American supplier institute, American Supplier Institute, Dearborn, Michigan.
Vernhes, L.; Azzi, M.; Klemberg-Sapieha, J.E. Alternatives for Hard Chromium Plating: Nanostructured Coatings for SevereService Valves. Mater. Chem. Phys. 2013, 140, 522–528.
Yang, G.-J.; Li, C.-J.; Zhang, S.-J.; Li, C.-X. High-Temperature Erosion of HVOF Sprayed Cr3C2-NiCr Coating and Mild Steel for Boiler Tubes. J. Therm. Spray Technol. 2008, 17, 782–787.
