Study on preparation and properties of wear-resistant thermal barrier coating on the surface of cylinder liner
The thermal barrier coating on the cylinder liner surface of diesel engine was an effective method to synergistically enhance its thermal resistance,wear resistance and anti-friction performance.NiCoCrAlY-YSZ double-layer thermal barrier coating with thickness of 1.5 mm was prepared on 38CrMoAlA substrate by supersonic high-energy plasma spraying equipment.Its microstructures,mechanical properties and high temperature tribological behavior were studied.The results showed that the porosity of the coating was about 9.62％±2.23％,and the bonding strength with the substrate was(30.33±1.89)MPa.Under the condition of oil lubrication,when the ambient temperature was 200 ℃,the wear rate of 38CrMoAlA matrix was about 1.96×10-4 mm3/(N·m),higher than the value 1.14×10-4 mm3/(N·m)of YSZ coating at 250 ℃.The friction and wear properties of the coating under oil lubrication were relatively excellent.The friction coefficient and wear rate of the coating without lubrication increased from 0.05 and 0.54×10-4 mm3/(N·m)to 0.70 and 2.97×10-4 mm3/(N·m),respectively.The wear mechanism of the coating was mainly abrasive wear.This research provided theoretical and technical support for the design and manufacture of the key components of low heat dissipation diesel engines.
plasma spraycylinder linerthermal barrier coatingfriction and wear
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