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.
Der Automobilsektor enthält mit der Produktion von verbrennungsbasierten Motoraggregaten für die metallverarbeitende Industrie nach wie vor eine anspruchsvolle Fertigungsaufgabe. Erst jetzt sind durchgängige Mess- und Prüfketten durch smarte, industrietaugliche Lösungsbausteine für diese Problemstellung verfügbar. Kompakte prozessorientierte Sensorik sowie ein auf das Wesentliche reduzierte Hard- und Softwaretechnologiemodul zeichnen diese vergleichsweise leicht zu integrierende Technik aus.
In the automotive sector, the production of combustion-based engine units remains an important field of activity for metalworking businesses. It is only now that continuous measurement and test chains can be implemented using smart industrial solutions for this problem. Compact process-orientated sensors together with associated stringently functional, minimalistic hard-and software module distinguish the presented solution.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.