A novel device for investigating the anti-melting loss performance of Ni60A coating on coppery tuyere

Abstract

Coppery tuyere is a core component in iron-making blast furnace, mainly used for supplying hot air and injecting pulverized coal. Due to the harsh service environment, tuyeres are prone to failure by wear and melting loss. Surface coatings can significantly improve the wear resistance of copper surface, but their anti-melting loss performance is still a research blank. This paper designed a novel device for testing the anti-melting loss performance of coatings. The device included plasma melting-drop, induction preheating and infrared temperature control systems, which can simulate the process of coating being corroded by molten iron under service conditions. Anti-melting loss test results of Ni60A coating indicated that the molten iron and the γ-(Cu, Fe, Ni) solid solution in the coating can form metallurgical bonding by element diffusion, thus adhering on the coating surface. The continuous accumulation of iron will worsen the heat-transfer capability of tuyere, making it more likely to cause melting loss. Adding ceramics in the Ni60A alloy or developing coating materials with higher melting points are expected to improve the anti-melting loss performance of coatings on coppery tuyere.