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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Bianco, R., Rapp, R.A. & Jacobson, N.S. Volatile species in halide-activated diffusion coating packs. Oxid Met 38, 33–43 (1992). https://doi.org/10.1007/BF00665043
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DOI: https://doi.org/10.1007/BF00665043