Corrosion of SiC ceramics by Na sub 2 SO sub 4

Journal Article · Fri Jan 01 04:00:00 UTC 1988 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1988.tb00170.x· OSTI ID:5962831

Federer, J I ^[1]

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1. Oak Ridge National Lab., TN (USA)

Previous work has shown that SiC ceramics are corroded by alkali halide vapor in an oxidizing atmosphere. The present work was conducted to determine if Na{sub 2}SO{sub 4} vapor caused similar corrosion. Specimens were exposed to Na{sub 2}SO{sub 4} vapor in an oxidizing atmosphere at 1,200{degree}C for 575 h. As a result, the specimens were covered with a silicate glass corrosion product, and surface recession had occurred. Corrosion was attributed to chemical alteration of the normally protective SiO{sub 2} film by Na{sub 2}O, which allowed oxidation of the SiC.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5962831
• Journal Information: Advanced Ceramic Materials; (USA), Journal Name: Advanced Ceramic Materials; (USA) Vol. 3:1; ISSN 0883-5551; ISSN ACEME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
ALKALI METAL COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
COATINGS
CORROSION
DATA
EXPERIMENTAL DATA
FLUIDS
GASES
HEAT EXCHANGERS
INFORMATION
NUMERICAL DATA
OXYGEN COMPOUNDS
PROTECTIVE COATINGS
SILICON CARBIDES
SILICON COMPOUNDS
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR COMPOUNDS
VAPORS
VERY HIGH TEMPERATURE