Corrosion behavior and mechanical properties of silicon carbide exposed to a coal gasification environment

Technical Report · Sat Jun 01 04:00:00 EDT 1985

OSTI ID:5538685

Easler, T E

Silicon carbide ceramic materials have been shown to have exceptional properties for many engineering applications. In the case of coal gasification systems, potential applications such as high-temperature heat exchangers must withstand a very hostile environment. This study included an evaluation of the effects of a coal gasification environment on the physical and mechanical properties of a silicon carbide ceramic. The corrosion behavior of specimens exposed in the absence or presence of a coal slag coating, and subsequent changes in mechanical properties, were evaluated. It was found that very little change in the specimens occurred after 200-h exposures at temperatures ranging from 1000 to 1300/sup 0/C, when coal slag was not applied. Samples exposed with a coal slag coating exhibited no change after exposure at the lowest temperature, 1000/sup 0/C. However, samples exposed at 1250 and 1300/sup 0/C, with a slag coating, exhibited weight loss and some degradation of mechanical properties due to slag/silicon carbide interactions. Evidence of the formation of a protective silica scale between the slag and the silicon carbide suggests that the corrosion reactions may be inhibited after an initial reaction period. 21 refs., 21 figs., 10 tabs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5538685
• Report Number(s): ANL/FE-84-21; ON: DE85015239
• 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
CERAMICS
CHEMICAL REACTIONS
COAL GASIFICATION PLANTS
CORROSION
DATA
EXPERIMENTAL DATA
INDUSTRIAL PLANTS
INFORMATION
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
NUMERICAL DATA
SILICON CARBIDES
SILICON COMPOUNDS
SLAGS
TEMPERATURE EFFECTS
TESTING
VERY HIGH TEMPERATURE