Piston ring having a thermally sprayed coating and method for producing same

Abstract

The invention relates to a method for producing a piston ring for an internal combustion engine, which comprises: providing a substrate; and applying a coating by means of thermal spraying of a powder, that includes solid lubricants, and comprises the elemental proportions 15-30 wt % of iron, Fe; 15-30 wt % of tungsten, W; 25-35 wt % of chromium, Cr; 10-35 wt % of nickel, Ni; 1-5 wt % of molybdenum, Mo; 0.2-3 wt % of aluminum, Al; 3-20 wt % of copper, Cu; 1-10 wt % of carbon, C; 0.1-2 wt % of sulfur, S; and 0.1-2 wt % of silicon, Si.

Description

technical field [0001] The invention relates to a piston ring with a thermally sprayed coating, more particularly comprising a solid lubricant, and to a corresponding production method thereof. Background technique [0002] The use of thermally sprayed coatings as wear protection for sliding elements is common in the industrial sector. When applied in an engine, the thermally sprayed coating is preferably used in the first and second grooves on the piston ring. R&D is increasingly focusing on iron-based materials in order to meet the physical and cost requirements of engine operation. [0003] The mating components for piston rings are also often based on iron. This increases the risk of scorch formation until it becomes seized, since under certain critical conditions (insufficient lubrication and high temperatures) adhesive wear of congener metals can occur. [0004] Correspondingly, layer systems need to be developed to reduce the tendency of iron-based sprayed coatings...

AI Technical Summary

Problems solved by technology

However, higher carbide content leads to lower fatigue strength and fracture toughness

Images