The Study of Plasma Cladding of Ni-Based Ti(C，N) Composite Reinforced Coatings

The Q235 steel has issues with poor wear resistance and hardness. To address this, a Ti(C，N)-reinforced Ni-based composite coating was fabricated on the surface of Q235 steel using plasma cladding technology. The influence of different TiC and TiN particle concentrations on the microstructure and properties of the Ni-based composite coating was investigated. The results show that the Ni-based reinforced coating primarily consists of matrix phases such as FeNi₃, Cr₂Ni₃, and NiTi, as well as hard phases like Ti(C，N). The microhardness of the coating increases with the TiC content, reaching a maximum of 874.6 HV_1.0 when 20 wt% TiC and 10 wt% TiN are added. As the TiN content increases, the wear mechanism transitions from oxidative wear to adhesive wear, abrasive wear, and oxidative wear. The coating exhibits the lowest wear weight loss rate, 1.21×10^-3g/N·h, when the mass fractions of TiC and TiN are 20% and 10%, respectively.