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Oxidation and hot corrosion of hot-pressed Si3N4 at 1000 deg C.

Author
Fielder, W. L.
Published
Apr 1, 1985.
Physical Description
1 electronic document
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Summary
The oxidation and hot corrosion of a commercial, hot-pressed Si3N4 were investigated at 1000 C under an atmosphere of flowing O2. For the hot corrosion studies, thin films of Na2SO4 were airbrushed on the Si3N4 surface. The hot corrosion attack was monitored by the following techniques: continuous weight measurements, SO2 evolution, film morphology, and chemical analyses. Even though the hot corrosion weight changes after 25 hr were relatively small, the formation of SiO2 from oxidation of Si3N4 was an order of magnitude greater in the presence of molten Na2SO4. The formation of a protective SiO2 phase at the Si3N4 surface is minimized by the fluxing action of the molten Na2SO4 thereby allowing the oxidation of the Si3N4 to proceed more rapidly. A simple process is proposed to account for the hot corrosion process.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19850013048.
Accession ID: 85N21358.
E-2419.
NAS 1.15:86977.
NASA-TM-86977.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15705401