Tribological properties and wear mechanism of SnAgCu-Al2O3/TiNi under velocity action
High-nickel titanium-based alloys(TiNi)have the advantages of low density and high specific strength,and are widely used in mechanical engineering and other fields.The poor wear resistance of TiNi al-loys limits the development and application of TiNi alloys in related fields.In order to improve the wear-reduc-ing and wear-resistant performance of TiNi alloy,a fish scale-like surface texture was designed and prepared on its surface using a laser marking machine,as well as filled with a composite solid lubricant SnAgCu-Al2O3(S-A/TiNi).The effects of different speeds on the tribological properties of the S-A/TiNi composites were investi-gated under the surface texture angle parameter of 70°.The results showed that the temperature rise on the ab-raded surface of S-A/TiNi-70° improved the plasticizing properties of the solid lubricant at a speed of 0.037 m/s.The solid lubricant was extruded from the weave under stress,promoting lubricant film generation and obtaining optimum tribological properties.At higher velocities(＞0.037 m/s),the temperature rise of the friction surface was fast,resul-ting in enhanced plastic properties of the solid lubricant.Damage to the lubrication film under stress results in reduced tribological performance.At lower velocities(＜0.037 m/s),more heat was generated on the friction surfaces,making the plastic deformation of the solid lubricant excessive.The lubricant film was prone to spalling under cyclic stress,lead-ing to a reduction in the tribological properties of the substrate.
S-A/TiNisolid lubricantspeedfriction and wearlubrication mechanism
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