Research on the influence law of different surface treatments on the fretting wear resistance of rolling flareless pipe connectors for titanium alloy pipes

This paper studies the wear behavior of TA18 titanium alloy pipe surfaces under three conditions of the sleeve material: primitive state, coated with molybdenum disulfide coating, and coated with Teflon coating. The research results show that the main wear mechanisms between the primitive sleeve material and the titanium pipe are fatigue wear and abrasive wear, and the surface of the pipe material is severely worn. The main wear mechanism between the sleeve material coated with molybdenum disulfide coating and the titanium pipe is adhesive wear. After the molybdenum disulfide coating falls off, it can evenly cover the surface of the pipe material, playing a good protective role, and the pipe material is hardly worn. The main wear mechanism between the sleeve material coated with Teflon coating and the titanium pipe is adhesive wear. The Teflon coating has a self-lubricating effect. After falling off and covering the surface of the pipe material, it can reduce friction and the degree of wear. Comprehensive analysis shows that when the sleeve material is coated with molybdenum disulfide coating, the rolling flareless pipe connector for TA18 titanium alloy pipes has the best fretting wear resistance.