In-Situ Synthesis of Tic-Reinforced Stellite 6 Coatings with Tife/Cr3c2 Powders Using Pta Cladding

To enhance the durability of copper tuyeres in blast furnaces, it is necessary to apply coatings on their surfaces to protect against wear caused by high-temperature coke. In this study, a series of in-situ synthetic TiC-reinforced Stellite 6 alloy coatings containing a Ni60A interlayer were successfully produced on copper substrates using 5-45 wt% TiFe/Cr3C2 precursor powders. The coatings exhibit excellent metallurgical bonding with the Ni60A interlayer, and a gradient of elemental transition zones were formed at the interface between the coating and the interlayer. XRD refinement analysis revealed that the TiC phase content within the coatings increased with the addition of TiFe/Cr3C2 powder. The T45 coating, containing 45 wt% of precursor powder, showed the highest TiC phase content, reaching 12.27%. Furthermore, the average hardness of the T45 coating was 658.15 HV0.2, which represented a notable increase of 31.2% compared to the Stellite 6 alloy. The Stellite 6 coating experienced plastic delamination at 25째C and oxidative wear at 500째C. As the TiC particle content in the coating increased, the dominant wear mechanism tended to shift towards abrasive wear. The specific wear mechanism of the coating was influenced by the content of coating phases and the operating temperature. The T45 coating exhibited the best wear resistance, demonstrating an abrasive wear mechanism at both 25째C and 500째C. The wear resistance of the T45 coating was found to be 4.47 and 5.94 times higher than that of the Stellite 6 alloy at these respective temperatures.