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Abstract
Chromium-plated copper rails previously tested as electromagnetic launcher rail conductors were studied. As-received specimens were characterized. To simulate the effect of liquid aluminum that is generated at the sliding interface, aluminum hot-dipping experiments were performed at high temperature. In addition, a further reliquification and spreading experiment to examine aluminum wetting on chromium was conducted. Numerous cracks and voids were found on the chromium layer of as-received specimens, and no molten aluminum–chromium interaction was found at the armature footprint because of the protection provided by the Cr 2O 3 scale. It was found that cracking due to the coefficient of thermal expansion mismatch upon heating allows oxide-free surfaces to interact with molten aluminum, and oxide formation on the surface of the aluminum deposit prevents the spreading of the deposit.
Published Version
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