Western Europe is currently experiencing huge growth in turbodiesel engined passenger cars. Recent trends in turbocharger technology have resulted in ever increasing demands being placed upon many of the system components. In particular, flexible hose sections are now challenged to survive increased temperatures and pressures whilst also providing barrier properties to today's aggressive engine oils. Continuous use temperatures of close to 200 deg C are now commonplace for turbocharger-intercooler hose sections. These hoses are typically a multilayer structure consisting of fabric reinforcement encapsulated with silicone rubber (VMQ) and lined internally with a layer of fluoroelastomer (FVMQ or FKM). Significant progress has been made resulting in optimised fluorosilicone rubber compounds to meet these requirements. Careful formulation allows excellent property retention in aggressive oil ageing e.g. 7 days @ 175 deg C in Total MA3 5w30. Similar observations are seen in heat ageing studies @ 200 deg C or 225 deg C. Additionally we have been able to demonstrate step change improvements in interlayer adhesion via the incorporation of suitable additive technology. Clearly the VMQ:FVMQ combination has much untapped potential still to be exploited. This paper will include the presentation of key data for various fluoroelastomers, with specific reference to turbocharger hose specifications. It is our belief that these findings can generate a wider interest in these materials enabling them to further penetrate other oil and fuel resistant applications. We have developed an excellent understanding that allows us to recommend specific fluorosilicone rubber formulations capable of meeting the demanding requirements for turbocharger hose liners. Correct selection of the appropriate fluorosilicone base has been combined with formulation expertise in the areas of heat stability additives, secondary fillers and adhesion promoter technology. These building blocks have produced optimum results for physical property retention after relevant exposure to both dry heat and hot oil. Additionally, we have shown the physical properties of FSR to be much less sensitive to testing @ 180C when compared either to FKM or AEM. Adhesion improvements have also been demonstrated to yield HCR-FSR bond strengths comfortably in excess of typical specifications. In summary we now see a very exciting potential for these optimised FSR materials to satisfy the growing needs for both high temperature and hot oil resistance. This process should be facilitated by a close collaboration between potential customers and FSR supplier. In this respect we have a wealth of knowledge that can assist the selection and qualification of the appropriate formulation and we would be very happy to discuss the subject further.
Recent advances in fluorosilicone rubber for turbocharger hose liners
Letzte Fortschritte bei Fluorsilicon-Gummi für Turboauflader-Schlauchauskleidungen
2005
8 Seiten, 9 Bilder
Conference paper
English
Recent advances in fluorosilicone rubbers for turbocharger hose liners
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