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- Title
Tribological Performance of a Composite Cold Spray for Coated Bores.
- Authors
Tomanik, Eduardo; Aubanel, Laurent; Bussas, Michael; Delloro, Francesco; Lampke, Thomas
- Abstract
The tribological performance of a thermal sprayed, mirror-like surface with localized protuberances was investigated through tribotests and computational simulation. A composite coating with a 410L steel matrix and M2 tool steel hard particles was applied by the cold spray process as a bore coating for combustion engines. The presence of protuberances promoted the quick formation of an antifriction tribofilm when tested with an SAE 0W-16 containing ZDDP and MoDTC, which significantly reduced the asperity friction in comparison to the conventional engine coated bores in reciprocating tribological tests. An in-house computational model using deterministic numerical methods was used for the mixed and hydrodynamic lubrication regime. Lubricant film thickness and friction were simulated for a piston ring versus the proposed coating. The computer simulations showed that the protuberances reduced the hydrodynamic friction by increasing the otherwise very thin oil film thickness of mirror-like surfaces. Although not intuitive, this result was caused by the reducing of the oil film shear rate.
- Subjects
COMPOSITE coating; TOOL-steel; ELASTOHYDRODYNAMIC lubrication; HYDRODYNAMIC lubrication; PISTON rings; THIN films; METAL spraying
- Publication
Lubricants (2075-4442), 2023, Vol 11, Issue 3, p127
- ISSN
2075-4442
- Publication type
Article
- DOI
10.3390/lubricants11030127