The oxidation of a directionally solidified cobalt-tungsten eutectic alloy |
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Authors: | J. J. Aliprando S. R. Shatynski |
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Affiliation: | (1) Gas Turbine Division, General Electric Company, 01901 Lynn, Massachusetts;(2) Department of Materials Engineering, Rensselaer Polytechnic Institute, 12181 Troy, New York |
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Abstract: | A study of the oxidation of directionally solidified Co-W alloys were performed at 750, 900, and 1050°C. The study involved a comparison of the oxidation behavior of directionally solidified and as-cast alloys along with the oxidation behavior of the pure components. The study incorporated both thermogravimetric kinetic measurements and morphological studies of the oxides as a function of both temperature and time. Differences were noticed in both the oxidation rate and the oxide morphology and were attributed to differences in alloy microstructure. The directionally solidified Co-W alloy was found to be more spall resistant but also oxidized more rapidly than the conventionally as-cast alloy. Both alloys were more oxidation resistant than the pure components. |
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Keywords: | directionally solidified eutectic alloy Co-W alloys thermogravimetric studies alloy morphology |
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