Surface Properties of MoN Coated Engine Piston Rings

The main objective of this investigation is the evaluation of the performance of hard diamond-like-carbon (DLC) or tungsten carbide (WC) and soft (epoxy composite) dual-coatings on the internal combustion (IC) engine piston rings as a protective coating to reduce their wear. The rings were coated with DLC or WC by physical vapor deposition (PVD) method and then soft polymeric composite coating (epoxy/graphene/base oil SN150) was applied on the hard coating. The tribological tests of the dual-coated piston rings were conducted for 3.6 × 105 cycles at 1500 rpm engine speed and 50% rated load of a diesel engine in order to evaluate the wear performance of the piston rings. Scuffing of cylinder liner and piston rings interface was prevented by the application of polymer composites over the hard-coated rings. DLC hard and soft polymer composite dual coating over the top piston ring was found to have the lowest wear rate 1.69 × 10−12 mm3/N·m compared with the wear rate of dual coatings on the middle and lower rings.

Download Full-text

Thermal and static analysis of engine piston rings

International Journal of Ambient Energy ◽

10.1080/01430750.2019.1636875 ◽

2019 ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

E. Gopi ◽

M. Saleem ◽

Sri Chandan ◽

Arun Nema

Keyword(s):

Static Analysis ◽

Piston Rings ◽

Engine Piston

Download Full-text

Numerical calculation and experimental study on friction and lubrication of Stirling engine piston ring

E3S Web of Conferences ◽

10.1051/e3sconf/202131302002 ◽

2021 ◽

Vol 313 ◽

pp. 02002

Author(s):

Li Songjian ◽

Zheng Wei ◽

Xu Wei ◽

Ling Hong

Keyword(s):

Numerical Calculation ◽

Numerical Model ◽

Contact Pressure ◽

Piston Ring ◽

Stirling Engine ◽

Piston Rings ◽

Working Pressure ◽

Engine Piston ◽

Intermediate Chamber ◽

Friction And Lubrication

To solve the practical problem of Stirling engine piston ring, numerical model on friction and lubrication were established based on average Reynolds equation theory. Numerical calculation results show: piston rings are in the mixed lubrication state which gas lubrication film and micro-convex body contact existing simultaneously; contact pressure is 2 orders of magnitude less than gas film pressure; contact pressure is approximately linearly related to mean gas pressure. Simulated test rig was built and experimental results show: high-pressure working gas leak to intermediate chamber through piston rings, and the pressure of intermediate chamber drops sharply at lowest pressure of circulation; piston ring wear increases when rotational speed or working pressure increase. The accuracy of numerical model was proved by experimental phenomena and test data.

Download Full-text