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

Journal Article · Tue Feb 01 04:00:00 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), Journal Name: Am. Ceram. Soc. Bull.; (United States) Vol. 62:2; ISSN ACSBA
• Country of Publication: United States
• Language: English

Related Subjects

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