Blackwell Publishing Journal Backfiles 1879-2005
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
The hot corrosion of a calcium aluminosilicate (CAS) glass-ceramic and a composite of CAS matrix that has been reinforced with Si-C-O (Nicalon) fiber has been investigated by X-ray diffractometry, scanning electron microscopy, and transmission electron microscopy. Samples of the monolithic CAS and the Si-C-O-CAS composite were subjected to corrosion using liquid sodium sulfate at 900°C for 50 h in air and argon environments. The monolithic and composite samples both were corroded by sodium sulfate, and corrosion damage in the composites was more severe than in the monolithic CAS, irrespective of the gaseous environment. The increased corrosion damage in the composites was due to the presence of Si-C-O fibers, which changes the mechanism of corrosion. The corrosion products in monolithic CAS were different from those in the composites; this disparity was also due to the presence of the fibers in the composite. The corrosion zones in all the samples were severely cracked, and the cracks extended into the unaffected regions of the samples. Mechanisms of hot corrosion have been proposed and discussed for both the monolithic and composite samples.
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