Behavior of tubular ceramic heat exchanger materials in acidic coal ash from coal-oil-mixture combustion

Journal Article · Tue Feb 01 00:00:00 EST 1983 · Am. Ceram. Soc. Bull.; (United States)

OSTI ID:5696009

Ferber, M K; Tennery, J

Tubes of five commercially available structural ceramics, including three types of SiC, a multiphase sialon, and a dense Al/sub 2/O/sub 3/ were exposed to the combustion products of an acidic ash coal. During the 496-h test, the tubular specimens exhibiting a wall temperature of 1230/sup 0/C experienced severe slagging conditions. The corrosion processes occurring in these materials were characterized using ceramographic and X-ray diffraction analyses. Reaction between the coal slag and SiC ceramics was generally quite limited. However, strong bonds were formed between the slag and both the alumina and sialon tubes. The extensive cracking observed in these materials apparently resulted from thermal expansion differences between these two ceramics and the coal slag.

• Research Organization: Oak Ridge National Lab, Oak Ridge, TN 37830
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5696009
• Journal Information: Am. Ceram. Soc. Bull.; (United States), Vol. 62:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMBUSTION PRODUCTS
CORROSIVE EFFECTS
HEAT EXCHANGERS
CORROSION
HEAT RESISTANT MATERIALS
INTERGRANULAR CORROSION
ALUMINIUM OXIDES
CERAMICS
CERAMOGRAPHY
CHEMICAL BONDS
COAL
CORROSION FATIGUE
CRACK PROPAGATION
DEPOSITION
HEAT PIPES
MATERIALS TESTING
PETROLEUM
SILICON CARBIDES
SLAGS
THERMAL EXPANSION
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
ENERGY SOURCES
EXPANSION
FATIGUE
FOSSIL FUELS
FUELS
MATERIALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SILICON COMPOUNDS
TESTING
360205* - Ceramics
Cermets
& Refractories- Corrosion & Erosion