Abstract
The Na2SO4-assisted hot corrosion resistance of Hi-Nicalon, Hi-Nicalon S, Sylramic and Sylramic iBN SiC fibers was characterized as a function of time and temperature. Na2SO4-loaded fibers were exposed in a tube furnace with 0.1% SO2/O2 flowing gas for times between 45 minutes and 24 hours, at temperatures between 900 and 1100C. Fibers were characterized after hot corrosion exposure, and after 24 hour water and HF soaks, by weight change measurements, Scanning Electron Microscopy, and Energy Dispersive X-Ray Spectroscopy. Inductively Coupled Plasma Optical Emission Spectroscopy was used to determine the elemental composition and concentration of dissolved corrosion products found in the water and HF soaks. It was observed across all fiber types that hot corrosion attack was rapid and severe, with fiber fusion, surface pitting and non-uniform scale build-up as common microstructural features. Differences in hot corrosion reactions were observed in surface morphologies and weight change measurements. Time dependence revealed that Hi Nicalon fibers exhibited the largest weight gain, while Sylramic, Sylramic iBN and Hi Nicalon S fibers had similar weight gains.
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