Friction and Wear Behaviors of Electroless Composite Coatings against Ti6Al4V Alloy at High Temperature

Ni-P-MoS₂ and Ni-P-CaF₂ composite coatings were deposited on AISI-1045 steel plate by electroless plating. Tribological performances of composite coatings heat treated at 300℃ for 2 h were investigated using a pin-on-disk configuration using Ni-P coating as reference. The influence of testing temperature on the friction and wear behaviors of coatings was discussed and wear mechanisms were analyzed at elevated temperatures. The results indicate that tribological performances of Ni-P-MoS₂ and Ni-P-CaF₂ composite coatings were superior to that of Ni-P coating with the increase of temperature from room temperature to 500℃. The tribological characteristic Ni-P-MoS₂ composite was better than that of Ni-P coating. A dense oxide film formed at the high temperature on the surface of Ni-P-MoS₂ composite coating decreased friction.