Volatile species in halide-activated diffusion coating packs |
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| Authors: | Robert Bianco Robert A. Rapp Nathan S. Jacobson |
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| Affiliation: | (1) Department of Materials Science and Engineering, The Ohio State University, 43210 Columbus, Ohio;(2) Lewis Research Center, National Aeronautics and Space Administration, 44135 Cleveland, Ohio |
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| Abstract: | An atmospheric pressure sampling mass spectrometer was used to identify the vapor species generated in a halide-activated, cementation pack. Pack powder mixtures containing a Cr-Al binary masteralloy powder, an NH4Cl activator salt, and either ZrO2 or Y2O3 (or neither) were analyzed at 1000°C. Both equilibrium calculations for the pack and mass spectrometer results indicated that volatile AlClx and CrCly species were generated by the pack powder mixture; in packs containing the reactive element oxide, volatile ZrClz and YClw species were formed by the conversion of their oxide sources. |
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| Keywords: | Pack cementation aluminide diffusion coatings metal halide vapors |
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