High Temperature Tribological Behavior of Electroless Plating Ni-P-Si3N4-WS2 Composite Coatings

Electroless nickel composite coatings have the potential for high-temperature tribological applications, and a combination of high wear resistance low friction factor is one desirable solutions but still tricky problem. The addition self-lubricating WS2 hard Si3N4 nanoparticles to Ni-P expected obtain good performance. In this work, Ni-P-Si3N4-WS2 with various contents were prepared using electroless plating subsequently annealed at 400 °C in an inert atmosphere. properties evaluated ball-on-disc instrument operating temperatures from 25 600 °C. microstructure, chemical composition, surface morphology characterized by X-ray diffractometry (XRD), energy disperse spectroscopy (EDS), scanning electron microscopy (SEM). Upon increasing dosage bath, content coating increased micro-hardness as-plated 539 717 HV. After heat treatment, underwent crystallization process, hardness 878 1094 main mechanism changed adhesive state abrasive state. 2.5 g/L bath exhibited excellent mechanical properties, 10.9 GPa, coefficient ~0.51, rate 8.4 × 10−15 m3N−1⋅m−1 room temperature, maintained optimal performance temperatures. At 200, 400, °C, form was <1.5 ≥1.5 g/L. synergism particles refined grains matrix obviously reduced pairs all