Effects of coal gasification environments on corrosion behavior and mechanical properties of siliconized silicon carbide

Technical Report · Sun Sep 01 04:00:00 EDT 1985

OSTI ID:5138492

Easler, T E

Potential applications of structural ceramic materials in coal gasifiers include high-temperature heat exchangers. This study is an evaluation of the effects of a coal gasification environment on the oxidation and corrosion behavior and mechanical properties of a candidate heat exchanger material, siliconized silicon carbide. The effects of exposure with and without acidic and basic coal slag coatings were studied. It was found that exposure of specimens from 1000 to 1300/sup 0/C without a slag coating resulted in silica scale growth by passive oxidation. Slag coatings had no effect at 1000/sup 0/C because the slags did not fuse. However, specimens exposed at 1250 and 1300/sup 0/C with slag coatings exhibited weight loss as a result of corrosive activity. The results of microscopic analyses suggest that a silica scale observed between the slag and silicon carbide may inhibit extensive corrosion after longer exposures. 14 refs., 15 figs., 9 tabs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5138492
• Report Number(s): ANL/FE-85-6; ON: DE86002552
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
CARBIDES
CARBON COMPOUNDS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL GASIFICATION PLANTS
CORROSION
CORROSIVE EFFECTS
DATA
ELEMENTS
EXPERIMENTAL DATA
HEAT EXCHANGERS
INDUSTRIAL PLANTS
INFORMATION
MATERIALS TESTING
MECHANICAL PROPERTIES
NUMERICAL DATA
OXIDATION
SEMIMETALS
SILICON
SILICON CARBIDES
SILICON COMPOUNDS
SLAGS
TEMPERATURE EFFECTS
TESTING
VERY HIGH TEMPERATURE