Microstructure and performance of (CoCrNi)88Al6Ti6-cBN composite coatings by high-speed laser cladding (HSLC): A novel strategy for synergizing wear-resistance and friction reduction

To enhance the wear-resistance of nickel-based blade surfaces, a (CoCrNi)88Al6Ti6-cBN composite coating was produced on GH4169 substrates using HSLC. The microstructure, microhardness and tribology properties of the coating at 25 and 600 °C were evaluated. The finding demonstrates that the hardness of the cBN composite coating increase by 91.6 HV0.3 attributed to precipitation strengthening, second phase strengthening and dislocation strengthening. Furthermore, the anti-wear performance of the coating increased by 3.72 times at 25 °C and by 3.23 times at 600 °C, respectively. Additionally, the friction coefficient exhibited by the coating diminished significantly by converting a portion of the cBN to hBN under the high temperatures generated by laser and oxides generating.