Brazed aluminium heat exchanger have become the standard for almost any heat exchanger application in modern cars due to their unique combination of light weight, high efficiency, low production cost and high resistance against environmental corrosion. Currently new diesel engine concepts with a so-called low pressure exhaust gas recirculation (LP-EGR) are close to serial production, which will help to reduce exhaust gas emissions, but will also create new opportunities and challenges for the use of aluminium within those systems. While lower operating temperatures will now allow the use of aluminium for EGR components like EGR coolers, internal corrosion from aggressive exhaust gas condensates becomes a major obstacle for the further use of conventional aluminium materials, even for traditional fullaluminium components like charge air coolers. A promising solution for this challenge is seen in the use of Aluminium multiclad materials. Such materials consist of several roll bonded layers of different aluminium alloys, which are optimized for their specific function, e.g. facilitate brazing, provide maximum corrosion resistance or mechanical strength. Hydro has developed new multiclad materials which combine a highly corrosion resistant interlayer with core alloys which are optimized for specific applications. This allows innovative heat exchanger designs with attractive properties. Furthermore outstanding corrosion resistance in SWAAT allows drastic down-gauging when Hydro's multiclad materials are used for tube and plate applications, e.g. in radiators and evaporators. The multiclad materials are compatible with all common brazing processes (CAB, vacuum).
Hydro aluminium - new multiclad materials
2012
11 Seiten, 17 Bilder
Conference paper
English
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