Abstract
In the current investigation, an equiatomic mixture of Ni and Ti was coated on the mild steel substrate by atmospheric plasma spray coating technology. The coating process was performed by varying the primary gas flow rate and plasma arc current process parameters. The microhardness and adhesion strength of the coating was evaluated after successful coating operation. The variation of microhardness and adhesion strength with primary gas flow rate and plasma arc current was observed. The results revealed that the microhardness varies directly with plasma arc current and primary gas flow rate. The enhancement in molten fraction and pinching effect was resulted due to increase in the primary gas flow rate that leads to the increase in microhardness. Furthermore, the enhancement in enthalpy and reduction in diffused air due to increase in arc current resulted in an increment in microhardness. The increase in plasma velocity and molten fraction of the particles resulted in better adhesion strength of the coating at higher gas flow rate and arc current. The microstructures of the coatings developed at higher and lower parameters support the above-stated relation.
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Swain, B., Mallick, P., Mohapatra, S.S. et al. Atmospheric Plasma Spray Coating of NiTi on Mild Steel Substrate: An Microstructural Investigation. J Bio Tribo Corros 7, 104 (2021). https://doi.org/10.1007/s40735-021-00541-4
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DOI: https://doi.org/10.1007/s40735-021-00541-4