An investigation into mechanics and tribology of SnAgCu and MoO3 containing in 20CrMnTi based composites

Abstract

Abstract The increasing in service life and operation reliability of the gearing system, the properties in mechanics and tribology of 20CrMnTi-steel-based materials need to be further optimized. Samples of 20CrMnTi (20CMT), 20CrMnTi-19.0 wt% SnAgCu (20CMT-S) and the 20CrMnTi-19.0 wt% SnAgCu-1.0 wt% MoO3 (20CMT-S-M) are fabricated on the D.R. Sinter® SPS3.20. Based on a nano-mechanical tribometer and the ball-on-disk tester, properties in mechanics and tribology of as-fabricated samples are understood. An excellent coordination of SnAgCu and MoO3 is beneficial in an increase in plasticity ductility from 9.5 to 10.5% of 20CMT-S-M. The values of indentation hardness, elasticity modulus and yield strength are slightly reduced down to 4.63 from 4.82 GPa, 168 from 200 GPa to 910 from 1030 MPa, respectively. An excellent lubrication of 20CMT-S-M is mainly attributed to a formed film containing SnAgCu and MoO3. An intra-lamellar separation of MoO3 tabular crystal can help the SnAgCu to better occur an outstanding plasticity deformation, that is more helpful in further decrease of friction resistance and material loss.