Mechanical properties and reciprocating sliding tribological behaviors of γ-TiAl substrate and plasma-based Mo–Si–Ti coating

• DOI: 10.1016/j.jmrt.2023.07.261
• Publication Date: 2023-08-06T01:02:56Z
• Authors: Fengkun Li; Rajdeep Singh Rawat; Pingze Zhang; Dongbo Wei; Ka Yang; Bo Dang
• Keywords: Mo–Si–Ti gradient coating; Mining engineering. Metallurgy; γ-TiAl; 0103 physical sciences; TN1-997; Wear mechanism; 01 natural sciences; Nanoindentation

Plasma Mo-Si-Ti coating including the (Ti, Mo)5Si3, MoSi2 and TiSi was prepared on γ-TiAl surface to improve wear resistance. The had 12-μm deposition layer 5-μm diffusion layer, as well gradual decrease of grain size from substrate coating, providing gradient structure high fracture toughness. Hardness (H), elasticity modulus (E), H/E H3/E2 values were 8.4 19.6 GPa, 167.2 251.8 0.050 0.078, 0.021 0.119 indicating that hardness, resistance plastic deformation load bearing capacity. During friction, both showed abrasive oxidative wear. flaked off in form large debris, causing rate. However, oxide film compacted fine debris made rates increased. released most external stress elastic work, showing load-bearing High toughness inhibited generation cracks reduced spallation coating. Moreover, grains promoted improved adhesion between Meanwhile, presence resulted a reduction rate excellent nanomechanical properties specific by about 98%, which could effectively at room temperature.