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3615 |
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Wednesday, May 21, 2014, Hall H1 & H2 2:00 PM Automotive Industry 1 |
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Corrosion resistant coatings for cylinder bore applications in passenger car engines |
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Felix Ernst* / Nemak Dillingen GmbH, Germany D. Kube / , F. Xavier/ , J. Schmid/ , |
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Thermally sprayed cylinder bore coatings give the opportunity to use tailored materials in the cylinder bore of passenger car engines with aluminum crankcases. For some applications coating material feedstock with ceramic content is needed as well as solid lubricants for high performance engines in motorsports. A relatively new demand is a certain resistance against corrosion that is caused by new using profiles and alternative fuels. Compared to cast in or slip-fit liners the material of thermally sprayed bore surfaces can easily be adapted to different markets and using profiles without changing the engine block. Content of this work is an investigation of the capability and performance of three different steel wires (1.4820 (X12 CrNi 25-4), 1.4016 (X6 Cr17), 1.4436 (X3 CrNiMo 17-13-3)) to be used as corrosion resistant coatings for cylinder bores in light metal crankcases. The materials were sprayed by a PTWA spraying system onto aluminum crankcases (alloy A319) which were mechanically roughened prior coating. The coatings have then been honed with different honing structures and their performance has been analyzed by wear tests as well as tensile strength and hardness measuring. |