Experimental analysis demonstrates superior melting loss resistance in FeCoNiCrTi coatings on copper, highlighting protective titanium-rich oxide barriers against molten iron.
To verify the usability of FeCoNiCrTi high-entropy alloy coating on metallurgical copper components (blast furnace tuyere), the melting loss resistance of coating was investigated by our self-designed device. Due to the special preferential oxidation of Ti element, a dense oxide layer (thickness about 700 nm) mainly containing Ti oxide forms on the original coating surface. The oxide layer acts as a barrier, causing the coating not to be eroded by molten iron. Comparative experiment shows that the coating after removing the oxide layer is prone to metallurgical bonding with molten iron, causing a great risk of melting loss. Thus, the melting loss resistance of original FeCoNiCrTi high-entropy alloy coating is significantly improved by this titanium-rich oxide layer. In practical applications, the oxide layer is recommended to be retained to adapt to the harsh environment of blast furnace tuyere.
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Zhang et al. (2026) studied this question.
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