Hot Corrosion in Gas Turbines: A New, Unique and Informative Technique is EASE (Electronic Absorption Spectroscopy Experiments)

摘要

The hot corrosion of advanced turbine materials used in aerospace applications may now be studied successfully with EASE (Electronic Absorption Spectroscopy Experiments). This technique permits the continuous monitoring of the dissolution of corrosion products into molten sulphate deposits under conditions which replicate effectively developed for studying ho corrosion on superheater tubes, and this preliminary study has developed and extended it to turbine materials, where the effects of thermal cycling and chloride addition can be followed. The report details the spectroscopic studies made and how rates are obtained from spectra; the design and testing of thermal gradient furnaces; and some crucible and spectroscopic studies of IN 738 in sulphate + chloride melts. A recently marketed American Fiber optic spectrophotometer could be modified to enhance EASE studies and make in situ studies of operating turbines. Keywords: Electronic absorption spectroscopy experiments, Gas turbines, Advanced turbine materials, Aerospace applications, Molten sulfates, Hot corrosion, Spectroscopy, Furnaces, Chloride corrosion, Crucible tests, Fiber optics.