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Simultaneous Chromizing-Aluminizing Coating of Nickel and Nickel-Base Superalloys

Published online by Cambridge University Press:  26 February 2011

V. A. Ravi  and
R. A. Rapp
V. A. Ravi
Affiliation:
Ravi Lanxide Corporation, l Tralee Industrial Park, Newark, DE 19714-6077
R. A. Rapp
Affiliation:
Rapp Department of Materials Science & Engineering, The Ohio State University, Columbus, OH 43210
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Abstract

Ni and Ni-base alloys have been simultaneously chromized-aluminized by a halide-activated pack cementation coating process. The computer program SOLGASMIX was used to calculate the equilibrium partial pressures of the gaseous species. Chloride-activated packs are predicted to be chromizingaluminizing while fluoride-activated packs are not. Codeposition of Cr and Al occurs in packs containing 90–95 w/o Cr in the masteralloy and either NaCl, CrCl2 or NH4 C1 as the halide salt activator at 1273K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 543
Copyright
Copyright © Materials Research Society 1989

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References

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